From a582e9a8d183c56d1aa8ae18afc1c11e2cbd6d2d Mon Sep 17 00:00:00 2001
From: drath <drath@b42882b7-edfa-0310-969c-e2dbd0fdcd60>
Date: Thu, 28 Sep 2006 10:41:43 +0000
Subject: [PATCH] - str9x flash support (Thanks to Spencer Oliver) - str75x
 flash support (Thanks to Spencer Oliver) - correct reporting of T-Bit in CPSR
 (Thanks to John Hartman for reporting this) - core-state (ARM/Thumb) can be
 switched by modifying CPSR - fixed bug in gdb_server register handling -
 register values > 32-bit should now be supported - several minor fixes and
 enhancements

git-svn-id: svn://svn.berlios.de/openocd/trunk@100 b42882b7-edfa-0310-969c-e2dbd0fdcd60
---
 src/flash/Makefile.am     |   4 +-
 src/flash/cfi.c           |   4 +
 src/flash/flash.c         |  13 +
 src/flash/str7x.c         |   9 +
 src/flash/str9x.c         | 635 ++++++++++++++++++++++++++++++++++++++
 src/flash/str9x.h         |  85 +++++
 src/helper/binarybuffer.c | 170 +++++++---
 src/helper/binarybuffer.h |   4 +-
 src/helper/interpreter.c  |   2 +-
 src/jtag/jtag.c           |  28 +-
 src/server/gdb_server.c   | 422 +++++++++++++++++++------
 src/target/arm966e.c      |   2 +
 src/target/arm9tdmi.c     |   2 +
 src/target/armv4_5.c      |  30 +-
 src/target/embeddedice.c  |   5 +-
 src/target/embeddedice.h  |   2 +-
 src/target/etm.c          |   5 +-
 src/target/etm.h          |   2 +-
 src/target/register.c     |   2 +-
 src/target/register.h     |   4 +-
 src/target/target.c       |  17 +-
 21 files changed, 1281 insertions(+), 166 deletions(-)
 create mode 100644 src/flash/str9x.c
 create mode 100644 src/flash/str9x.h

diff --git a/src/flash/Makefile.am b/src/flash/Makefile.am
index 61e363c92..65692e3a2 100644
--- a/src/flash/Makefile.am
+++ b/src/flash/Makefile.am
@@ -1,5 +1,5 @@
 INCLUDES = -I$(top_srcdir)/src/helper -I$(top_srcdir)/src/jtag -I$(top_srcdir)/src/target $(all_includes)
 METASOURCES = AUTO
 noinst_LIBRARIES = libflash.a
-libflash_a_SOURCES = flash.c lpc2000.c cfi.c at91sam7.c str7x.c
-noinst_HEADERS = flash.h lpc2000.h cfi.h at91sam7.h str7x.h
+libflash_a_SOURCES = flash.c lpc2000.c cfi.c at91sam7.c str7x.c str9x.c
+noinst_HEADERS = flash.h lpc2000.h cfi.h at91sam7.h str7x.h str9x.h
diff --git a/src/flash/cfi.c b/src/flash/cfi.c
index a90093f42..bb548c22d 100644
--- a/src/flash/cfi.c
+++ b/src/flash/cfi.c
@@ -685,6 +685,8 @@ int cfi_intel_write_block(struct flash_bank_s *bank, u8 *buffer, u32 address, u3
 		count -= thisrun_count;
 	}
 	
+	target_free_working_area(target, source);
+	
 	destroy_reg_param(&reg_params[0]);
 	destroy_reg_param(&reg_params[1]);
 	destroy_reg_param(&reg_params[2]);
@@ -882,6 +884,8 @@ int cfi_probe(struct flash_bank_s *bank)
 	cfi_info->qry[1] = cfi_query_u8(bank, 0, 0x11);
 	cfi_info->qry[2] = cfi_query_u8(bank, 0, 0x12);
 	
+	DEBUG("CFI qry returned: 0x%2.2x 0x%2.2x 0x%2.2x", cfi_info->qry[0], cfi_info->qry[1], cfi_info->qry[2]);
+	
 	if ((cfi_info->qry[0] != 'Q') || (cfi_info->qry[1] != 'R') || (cfi_info->qry[2] != 'Y'))
 	{
 		cfi_command(bank, 0xf0, command);
diff --git a/src/flash/flash.c b/src/flash/flash.c
index 7d199cfcc..736d3fca1 100644
--- a/src/flash/flash.c
+++ b/src/flash/flash.c
@@ -51,6 +51,7 @@ extern flash_driver_t lpc2000_flash;
 extern flash_driver_t cfi_flash;
 extern flash_driver_t at91sam7_flash;
 extern flash_driver_t str7x_flash;
+extern flash_driver_t str9x_flash;
 
 flash_driver_t *flash_drivers[] =
 {
@@ -58,6 +59,7 @@ flash_driver_t *flash_drivers[] =
 	&cfi_flash,
 	&at91sam7_flash,
 	&str7x_flash,
+	&str9x_flash,
 	NULL,
 };
 
@@ -366,6 +368,10 @@ int handle_flash_erase_command(struct command_context_s *cmd_ctx, char *cmd, cha
 		int last = strtoul(args[2], NULL, 0);
 		int retval;
 		flash_bank_t *p = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
+		struct timeval start, end, duration;
+
+		gettimeofday(&start, NULL);
+	
 		if (!p)
 		{
 			command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
@@ -398,6 +404,13 @@ int handle_flash_erase_command(struct command_context_s *cmd_ctx, char *cmd, cha
 					command_print(cmd_ctx, "unknown error");
 			}
 		}
+		else
+		{
+			gettimeofday(&end, NULL);	
+			timeval_subtract(&duration, &end, &start);
+		
+			command_print(cmd_ctx, "erased sectors %i through %i on flash bank %i in %is %ius", first, last, strtoul(args[0], 0, 0), duration.tv_sec, duration.tv_usec);
+		}
 	}
 	else
 	{
diff --git a/src/flash/str7x.c b/src/flash/str7x.c
index 0419394e7..62acba387 100644
--- a/src/flash/str7x.c
+++ b/src/flash/str7x.c
@@ -183,6 +183,15 @@ int str7x_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char
 			bank->base = 0x80000000;
 		}
 	}
+	else if (strcmp(args[5], "STR75x") == 0)
+	{
+		str7x_info->bank1 = 1;
+		if (bank->base != 0x20000000)
+		{
+			WARNING("overriding flash base address for STR75x device with 0x20000000");
+			bank->base = 0x20000000;
+		}
+	}
 	else
 	{
 		ERROR("unknown STR7x variant");
diff --git a/src/flash/str9x.c b/src/flash/str9x.c
new file mode 100644
index 000000000..054f5d0a8
--- /dev/null
+++ b/src/flash/str9x.c
@@ -0,0 +1,635 @@
+/***************************************************************************
+ *   Copyright (C) 2005 by Dominic Rath                                    *
+ *   Dominic.Rath@gmx.de                                                   *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "replacements.h"
+
+#include "str9x.h"
+#include "flash.h"
+#include "target.h"
+#include "log.h"
+#include "armv4_5.h"
+#include "algorithm.h"
+#include "binarybuffer.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+str9x_mem_layout_t mem_layout_str9[] = {
+	{0x00000000, 0x10000, 0x01},
+	{0x00010000, 0x10000, 0x02},
+	{0x00020000, 0x10000, 0x04},
+	{0x00030000, 0x10000, 0x08},
+	{0x00040000, 0x10000, 0x10},
+	{0x00050000, 0x10000, 0x20},
+	{0x00060000, 0x10000, 0x40},
+	{0x00070000, 0x10000, 0x80},
+	{0x00080000, 0x02000, 0x100},
+	{0x00082000, 0x02000, 0x200},
+	{0x00084000, 0x02000, 0x400},
+	{0x00086000, 0x02000, 0x800}
+};
+
+int str9x_register_commands(struct command_context_s *cmd_ctx);
+int str9x_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct flash_bank_s *bank);
+int str9x_erase(struct flash_bank_s *bank, int first, int last);
+int str9x_protect(struct flash_bank_s *bank, int set, int first, int last);
+int str9x_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count);
+int str9x_probe(struct flash_bank_s *bank);
+int str9x_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+int str9x_protect_check(struct flash_bank_s *bank);
+int str9x_erase_check(struct flash_bank_s *bank);
+int str9x_info(struct flash_bank_s *bank, char *buf, int buf_size);
+
+int str9x_handle_flash_config_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);
+
+flash_driver_t str9x_flash =
+{
+	.name = "str9x",
+	.register_commands = str9x_register_commands,
+	.flash_bank_command = str9x_flash_bank_command,
+	.erase = str9x_erase,
+	.protect = str9x_protect,
+	.write = str9x_write,
+	.probe = str9x_probe,
+	.erase_check = str9x_erase_check,
+	.protect_check = str9x_protect_check,
+	.info = str9x_info
+};
+
+int str9x_register_commands(struct command_context_s *cmd_ctx)
+{
+	command_t *str9x_cmd = register_command(cmd_ctx, NULL, "str9x", NULL, COMMAND_ANY, NULL);
+	
+	register_command(cmd_ctx, str9x_cmd, "flash_config", str9x_handle_flash_config_command, COMMAND_EXEC,
+					 "configure str9 flash controller");
+					 
+	return ERROR_OK;
+}
+
+int str9x_build_block_list(struct flash_bank_s *bank)
+{
+	str9x_flash_bank_t *str9x_info = bank->driver_priv;
+	
+	int i;
+	int num_sectors = 0, b0_sectors = 0;
+		
+	switch (bank->size)
+	{
+		case 256 * 1024:
+			b0_sectors = 4;
+			break;
+		case 512 * 1024:
+			b0_sectors = 8;
+			break;
+		default:
+			ERROR("BUG: unknown bank->size encountered");
+			exit(-1);
+	}
+	
+	num_sectors = b0_sectors + 2;
+	
+	bank->num_sectors = num_sectors;
+	bank->sectors = malloc(sizeof(flash_sector_t) * num_sectors);
+	str9x_info->sector_bits = malloc(sizeof(u32) * num_sectors);
+	
+	num_sectors = 0;
+	
+	for (i = 0; i < b0_sectors; i++)
+	{
+		bank->sectors[num_sectors].offset = mem_layout_str9[i].sector_start;
+		bank->sectors[num_sectors].size = mem_layout_str9[i].sector_size;
+		bank->sectors[num_sectors].is_erased = -1;
+		bank->sectors[num_sectors].is_protected = 1;
+		str9x_info->sector_bits[num_sectors++] = mem_layout_str9[i].sector_bit;
+	}
+	
+	for (i = 8; i < 12; i++)
+	{
+		bank->sectors[num_sectors].offset = mem_layout_str9[i].sector_start;
+		bank->sectors[num_sectors].size = mem_layout_str9[i].sector_size;
+		bank->sectors[num_sectors].is_erased = -1;
+		bank->sectors[num_sectors].is_protected = 1;
+		str9x_info->sector_bits[num_sectors++] = mem_layout_str9[i].sector_bit;
+	}
+	
+	return ERROR_OK;
+}
+
+/* flash bank str9x <base> <size> 0 0 <target#>
+ */
+int str9x_flash_bank_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct flash_bank_s *bank)
+{
+	str9x_flash_bank_t *str9x_info;
+	
+	if (argc < 6)
+	{
+		WARNING("incomplete flash_bank str9x configuration");
+		return ERROR_FLASH_BANK_INVALID;
+	}
+	
+	str9x_info = malloc(sizeof(str9x_flash_bank_t));
+	bank->driver_priv = str9x_info;
+	
+	if (bank->base != 0x00000000)
+	{
+		WARNING("overriding flash base address for STR91x device with 0x00000000");
+		bank->base = 0x00000000;
+	}
+	
+	str9x_info->target = get_target_by_num(strtoul(args[5], NULL, 0));
+	if (!str9x_info->target)
+	{
+		ERROR("no target '%s' configured", args[5]);
+		exit(-1);
+	}
+
+	str9x_build_block_list(bank);
+	
+	str9x_info->write_algorithm = NULL;
+	
+	return ERROR_OK;
+}
+
+int str9x_blank_check(struct flash_bank_s *bank, int first, int last)
+{
+	str9x_flash_bank_t *str9x_info = bank->driver_priv;
+	target_t *target = str9x_info->target;
+	u8 *buffer;
+	int i;
+	int nBytes;
+	
+	if ((first < 0) || (last > bank->num_sectors))
+		return ERROR_FLASH_SECTOR_INVALID;
+
+	if (str9x_info->target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+	
+	buffer = malloc(256);
+	
+	for (i = first; i <= last; i++)
+	{
+		bank->sectors[i].is_erased = 1;
+
+		target->type->read_memory(target, bank->base + bank->sectors[i].offset, 4, 256/4, buffer);
+		
+		for (nBytes = 0; nBytes < 256; nBytes++)
+		{
+			if (buffer[nBytes] != 0xFF)
+			{
+				bank->sectors[i].is_erased = 0;
+				break;
+			}
+		}	
+	}
+	
+	free(buffer);
+
+	return ERROR_OK;
+}
+
+int str9x_protect_check(struct flash_bank_s *bank)
+{
+	str9x_flash_bank_t *str9x_info = bank->driver_priv;
+	target_t *target = str9x_info->target;
+	
+	int i;
+	u32 adr;
+	u16 status;
+
+	if (str9x_info->target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+
+	/* read level one protection */
+	
+	adr = mem_layout_str9[10].sector_start + 4;
+	
+	target_write_u32(target, adr, 0x90);
+	target_read_u16(target, adr, &status);
+	target_write_u32(target, adr, 0xFF);
+	
+	for (i = 0; i < bank->num_sectors; i++)
+	{
+		if (status & str9x_info->sector_bits[i])
+			bank->sectors[i].is_protected = 1;
+		else
+			bank->sectors[i].is_protected = 0;
+	}
+	
+	return ERROR_OK;
+}
+
+int str9x_erase(struct flash_bank_s *bank, int first, int last)
+{
+	str9x_flash_bank_t *str9x_info = bank->driver_priv;
+	target_t *target = str9x_info->target;
+	int i;
+	u32 adr;
+	u8 status;
+	
+	if (str9x_info->target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+    
+	for (i = first; i <= last; i++)
+	{
+		adr = bank->sectors[i].offset;
+		
+    	/* erase sectors */
+		target_write_u16(target, adr, 0x20);
+		target_write_u16(target, adr, 0xD0);
+		
+		/* get status */
+		target_write_u16(target, adr, 0x70);
+		
+		while (1) {
+			target_read_u8(target, adr, &status);
+			if( status & 0x80 )
+				break;
+			usleep(1000);
+		}
+		
+		/* clear status, also clear read array */
+		target_write_u16(target, adr, 0x50);
+		
+		/* read array command */
+		target_write_u16(target, adr, 0xFF);
+		
+		if( status & 0x22 )
+		{
+			ERROR("error erasing flash bank, status: 0x%x", status);
+			return ERROR_FLASH_OPERATION_FAILED;
+		}
+	}
+	
+	for (i = first; i <= last; i++)
+		bank->sectors[i].is_erased = 1;
+
+	return ERROR_OK;
+}
+
+int str9x_protect(struct flash_bank_s *bank, int set, int first, int last)
+{
+	str9x_flash_bank_t *str9x_info = bank->driver_priv;
+	target_t *target = str9x_info->target;
+	int i;
+	u32 adr;
+	u8 status;
+	
+	if (str9x_info->target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+	
+	for (i = first; i <= last; i++)
+	{
+		/* Level One Protection */
+	
+		adr = bank->sectors[i].offset;
+		
+		target_write_u16(target, adr, 0x60);
+		if( set )
+			target_write_u16(target, adr, 0x01);
+		else
+			target_write_u16(target, adr, 0xD0);
+		
+		/* query status */
+		target_read_u8(target, adr, &status);
+	}
+	
+	return ERROR_OK;
+}
+
+int str9x_write_block(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
+{
+	str9x_flash_bank_t *str9x_info = bank->driver_priv;
+	target_t *target = str9x_info->target;
+	u32 buffer_size = 8192;
+	working_area_t *source;
+	u32 address = bank->base + offset;
+	reg_param_t reg_params[4];
+	armv4_5_algorithm_t armv4_5_info;
+	int retval;
+	
+	u32 str9x_flash_write_code[] = {
+					/* write:				*/
+		0xe3c14003,	/*	bic	r4, r1, #3		*/
+		0xe3a03040,	/*	mov	r3, #0x40		*/
+		0xe1c430b0,	/*	strh r3, [r4, #0]	*/
+		0xe0d030b2,	/*	ldrh r3, [r0], #2	*/
+		0xe0c130b2,	/*	strh r3, [r1], #2	*/
+		0xe3a03070,	/*	mov r3, #0x70		*/
+		0xe1c430b0,	/*	strh r3, [r4, #0]	*/
+					/* busy:				*/
+		0xe5d43000,	/*	ldrb r3, [r4, #0]	*/
+		0xe3130080,	/*	tst r3, #0x80		*/
+		0x0afffffc,	/*	beq busy			*/
+		0xe3a05050,	/*	mov	r5, #0x50		*/
+		0xe1c450b0,	/*	strh r5, [r4, #0]	*/
+		0xe3a050ff,	/*	mov	r5, #0xFF		*/
+		0xe1c450b0,	/*	strh r5, [r4, #0]	*/
+		0xe3130012,	/*	tst	r3, #0x12		*/
+		0x1a000001,	/*	bne exit			*/
+		0xe2522001,	/*	subs r2, r2, #1		*/
+		0x1affffed,	/*	bne write			*/
+					/* exit:				*/
+		0xeafffffe,	/*	b exit				*/
+	};
+	
+	u8 str9x_flash_write_code_buf[76];
+	int i;
+	
+	/* flash write code */
+	if (!str9x_info->write_algorithm)
+	{
+		if (target_alloc_working_area(target, 4 * 19, &str9x_info->write_algorithm) != ERROR_OK)
+		{
+			WARNING("no working area available, can't do block memory writes");
+			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+		};
+
+		/* convert flash writing code into a buffer in target endianness */
+		for (i = 0; i < 19; i++)
+			target_buffer_set_u32(target, str9x_flash_write_code_buf + i*4, str9x_flash_write_code[i]);
+			
+		target_write_buffer(target, str9x_info->write_algorithm->address, 19 * 4, str9x_flash_write_code_buf);
+	}
+
+	/* memory buffer */
+	while (target_alloc_working_area(target, buffer_size, &source) != ERROR_OK)
+	{
+		buffer_size /= 2;
+		if (buffer_size <= 256)
+		{
+			/* if we already allocated the writing code, but failed to get a buffer, free the algorithm */
+			if (str9x_info->write_algorithm)
+				target_free_working_area(target, str9x_info->write_algorithm);
+			
+			WARNING("no large enough working area available, can't do block memory writes");
+			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
+		}
+	};
+	
+	armv4_5_info.common_magic = ARMV4_5_COMMON_MAGIC;
+	armv4_5_info.core_mode = ARMV4_5_MODE_SVC;
+	armv4_5_info.core_state = ARMV4_5_STATE_ARM;
+	
+	init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
+	init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
+	init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
+	init_reg_param(&reg_params[3], "r3", 32, PARAM_IN);
+	
+	while (count > 0)
+	{
+		u32 thisrun_count = (count > (buffer_size / 2)) ? (buffer_size / 2) : count;
+		
+		target_write_buffer(target, source->address, thisrun_count * 2, buffer);
+		
+		buf_set_u32(reg_params[0].value, 0, 32, source->address);
+		buf_set_u32(reg_params[1].value, 0, 32, address);
+		buf_set_u32(reg_params[2].value, 0, 32, thisrun_count);
+
+		if ((retval = target->type->run_algorithm(target, 0, NULL, 4, reg_params, str9x_info->write_algorithm->address, str9x_info->write_algorithm->address + (18 * 4), 10000, &armv4_5_info)) != ERROR_OK)
+		{
+			ERROR("error executing str9x flash write algorithm");
+			return ERROR_FLASH_OPERATION_FAILED;
+		}
+	
+		if (buf_get_u32(reg_params[3].value, 0, 32) != 0x80)
+		{
+			return ERROR_FLASH_OPERATION_FAILED;
+		}
+		
+		buffer += thisrun_count * 2;
+		address += thisrun_count * 2;
+		count -= thisrun_count;
+	}
+	
+	destroy_reg_param(&reg_params[0]);
+	destroy_reg_param(&reg_params[1]);
+	destroy_reg_param(&reg_params[2]);
+	destroy_reg_param(&reg_params[3]);
+	
+	return ERROR_OK;
+}
+
+int str9x_write(struct flash_bank_s *bank, u8 *buffer, u32 offset, u32 count)
+{
+	str9x_flash_bank_t *str9x_info = bank->driver_priv;
+	target_t *target = str9x_info->target;
+	u32 words_remaining = (count / 2);
+	u32 bytes_remaining = (count & 0x00000001);
+	u32 address = bank->base + offset;
+	u32 bytes_written = 0;
+	u8 status;
+	u32 retval;
+	u32 check_address = offset;
+	u32 bank_adr;
+	int i;
+	
+	if (str9x_info->target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+	
+	if (offset & 0x1)
+	{
+		WARNING("offset 0x%x breaks required 2-byte alignment", offset);
+		return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
+	}
+	
+	for (i = 0; i < bank->num_sectors; i++)
+	{
+		u32 sec_start = bank->sectors[i].offset;
+		u32 sec_end = sec_start + bank->sectors[i].size;
+		
+		/* check if destination falls within the current sector */
+		if ((check_address >= sec_start) && (check_address < sec_end))
+		{
+			/* check if destination ends in the current sector */
+			if (offset + count < sec_end)
+				check_address = offset + count;
+			else
+				check_address = sec_end;
+		}
+	}
+	
+	if (check_address != offset + count)
+		return ERROR_FLASH_DST_OUT_OF_BANK;
+	
+	/* multiple half words (2-byte) to be programmed? */
+	if (words_remaining > 0) 
+	{
+		/* try using a block write */
+		if ((retval = str9x_write_block(bank, buffer, offset, words_remaining)) != ERROR_OK)
+		{
+			if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
+			{
+				/* if block write failed (no sufficient working area),
+				 * we use normal (slow) single dword accesses */ 
+				WARNING("couldn't use block writes, falling back to single memory accesses");
+			}
+			else if (retval == ERROR_FLASH_OPERATION_FAILED)
+			{
+				ERROR("flash writing failed with error code: 0x%x", retval);
+				return ERROR_FLASH_OPERATION_FAILED;
+			}
+		}
+		else
+		{
+			buffer += words_remaining * 2;
+			address += words_remaining * 2;
+			words_remaining = 0;
+		}
+	}
+
+	while (words_remaining > 0)
+	{
+		bank_adr = address & 0x03;
+		
+		/* write data command */
+		target_write_u16(target, bank_adr, 0x40);
+		target->type->write_memory(target, address, 2, 1, buffer + bytes_written);
+		
+		/* get status command */
+		target_write_u16(target, bank_adr, 0x70);
+		
+		while (1) {
+			target_read_u8(target, bank_adr, &status);
+			if( status & 0x80 )
+				break;
+			usleep(1000);
+		}
+		
+		/* clear status reg and read array */
+		target_write_u16(target, bank_adr, 0x50);
+		target_write_u16(target, bank_adr, 0xFF);
+		
+		if (status & 0x10)
+			return ERROR_FLASH_OPERATION_FAILED;
+		else if (status & 0x02)
+			return ERROR_FLASH_OPERATION_FAILED;
+
+		bytes_written += 2;
+		words_remaining--;
+		address += 2;
+	}
+	
+	if (bytes_remaining)
+	{
+		u8 last_halfword[2] = {0xff, 0xff};
+		int i = 0;
+				
+		while(bytes_remaining > 0)
+		{
+			last_halfword[i++] = *(buffer + bytes_written); 
+			bytes_remaining--;
+			bytes_written++;
+		}
+		
+		bank_adr = address & 0x03;
+		
+		/* write data comamnd */
+		target_write_u16(target, bank_adr, 0x40);
+		target->type->write_memory(target, address, 2, 1, last_halfword);
+		
+		/* query status command */
+		target_write_u16(target, bank_adr, 0x70);
+		
+		while (1) {
+			target_read_u8(target, bank_adr, &status);
+			if( status & 0x80 )
+				break;
+			usleep(1000);
+		}
+		
+		/* clear status reg and read array */
+		target_write_u16(target, bank_adr, 0x50);
+		target_write_u16(target, bank_adr, 0xFF);
+		
+		if (status & 0x10)
+			return ERROR_FLASH_OPERATION_FAILED;
+		else if (status & 0x02)
+			return ERROR_FLASH_OPERATION_FAILED;
+	}
+		
+	return ERROR_OK;
+}
+
+int str9x_probe(struct flash_bank_s *bank)
+{
+	return ERROR_OK;
+}
+
+int str9x_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+	return ERROR_OK;
+}
+
+int str9x_erase_check(struct flash_bank_s *bank)
+{
+	return str9x_blank_check(bank, 0, bank->num_sectors - 1);
+}
+
+int str9x_info(struct flash_bank_s *bank, char *buf, int buf_size)
+{
+	snprintf(buf, buf_size, "str9x flash driver info" );
+	return ERROR_OK;
+}
+
+int str9x_handle_flash_config_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
+{
+	str9x_flash_bank_t *str9x_info;
+	flash_bank_t *bank;
+	target_t *target = NULL;
+	
+	if (argc < 4)
+	{
+		command_print(cmd_ctx, "usage: str9x flash_config b0size b1size b0start b1start");
+		return ERROR_OK;
+	}
+	
+	bank = get_flash_bank_by_num(0);
+	str9x_info = bank->driver_priv;
+	target = str9x_info->target;
+	
+	if (str9x_info->target->state != TARGET_HALTED)
+	{
+		return ERROR_TARGET_NOT_HALTED;
+	}
+	
+	/* config flash controller */
+	target_write_u32(target, FLASH_BBSR, strtoul(args[0], NULL, 0));
+	target_write_u32(target, FLASH_NBBSR, strtoul(args[1], NULL, 0));
+    target_write_u32(target, FLASH_BBADR, (strtoul(args[2], NULL, 0) >> 2));
+    target_write_u32(target, FLASH_NBBADR, (strtoul(args[3], NULL, 0) >> 2));
+
+	/* enable flash bank 1 */
+    target_write_u32(target, FLASH_CR, 0x18);
+	return ERROR_OK;
+}
diff --git a/src/flash/str9x.h b/src/flash/str9x.h
new file mode 100644
index 000000000..0cd1f1962
--- /dev/null
+++ b/src/flash/str9x.h
@@ -0,0 +1,85 @@
+/***************************************************************************
+ *   Copyright (C) 2005 by Dominic Rath                                    *
+ *   Dominic.Rath@gmx.de                                                   *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   This program is distributed in the hope that it will be useful,       *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU General Public License for more details.                          *
+ *                                                                         *
+ *   You should have received a copy of the GNU General Public License     *
+ *   along with this program; if not, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+#ifndef STR9X_H
+#define STR9X_H
+
+#include "flash.h"
+#include "target.h"
+
+typedef struct str9x_flash_bank_s
+{
+	struct target_s *target;
+	u32 *sector_bits;
+	working_area_t *write_algorithm;
+} str9x_flash_bank_t;
+
+enum str9x_status_codes
+{
+	STR9X_CMD_SUCCESS = 0,
+	STR9X_INVALID_COMMAND = 1,
+	STR9X_SRC_ADDR_ERROR = 2,
+	STR9X_DST_ADDR_ERROR = 3,
+	STR9X_SRC_ADDR_NOT_MAPPED = 4,
+	STR9X_DST_ADDR_NOT_MAPPED = 5,
+	STR9X_COUNT_ERROR = 6,
+	STR9X_INVALID_SECTOR = 7,
+	STR9X_SECTOR_NOT_BLANK = 8,
+	STR9X_SECTOR_NOT_PREPARED = 9,
+	STR9X_COMPARE_ERROR = 10,
+	STR9X_BUSY = 11
+};
+
+/* FMI sectors */
+
+#define FMI_BANK_0	(0x5400000C << 2)			/* FMI Bank 0 */
+#define FMI_BANK_1	(0x54000010 << 2)			/* FMI Bank 1 */
+
+#define FMI_B0S0	(0x00000000 + FMI_BANK_0)	/* Bank 0 sector 0 */
+#define FMI_B0S1	(0x00010000 + FMI_BANK_0)	/* Bank 0 sector 1 */
+#define FMI_B0S2	(0x00020000 + FMI_BANK_0)	/* Bank 0 sector 2 */
+#define FMI_B0S3	(0x00030000 + FMI_BANK_0)	/* Bank 0 sector 3 */
+#define FMI_B0S4	(0x00040000 + FMI_BANK_0)	/* Bank 0 sector 4 */
+#define FMI_B0S5	(0x00050000 + FMI_BANK_0)	/* Bank 0 sector 5 */
+#define FMI_B0S6	(0x00060000 + FMI_BANK_0)	/* Bank 0 sector 6 */
+#define FMI_B0S7	(0x00070000 + FMI_BANK_0)	/* Bank 0 sector 7 */
+
+#define FMI_B1S0	(0x00000000 + FMI_BANK_1)	/* Bank 1 sector 0 */
+#define FMI_B1S1	(0x00002000 + FMI_BANK_1)	/* Bank 1 sector 1 */
+#define FMI_B1S2	(0x00004000 + FMI_BANK_1)	/* Bank 1 sector 2 */
+#define FMI_B1S3	(0x00006000 + FMI_BANK_1)	/* Bank 1 sector 3 */
+
+/*  Flash registers */
+
+#define FLASH_BBSR		0x54000000		/* Boot Bank Size Register                */
+#define FLASH_NBBSR		0x54000004		/* Non-Boot Bank Size Register            */
+#define FLASH_BBADR		0x5400000C		/* Boot Bank Base Address Register        */
+#define FLASH_NBBADR	0x54000010		/* Non-Boot Bank Base Address Register    */
+#define FLASH_CR		0x54000018		/* Control Register                       */
+#define FLASH_SR		0x5400001C		/* Status Register                        */
+#define FLASH_BCE5ADDR	0x54000020		/* BC Fifth Entry Target Address Register */
+
+typedef struct str9x_mem_layout_s {
+	u32 sector_start;
+	u32 sector_size;
+	u32 sector_bit;
+} str9x_mem_layout_t;
+
+#endif /* STR9X_H */
+
diff --git a/src/helper/binarybuffer.c b/src/helper/binarybuffer.c
index ce33f138f..6afd6e593 100644
--- a/src/helper/binarybuffer.c
+++ b/src/helper/binarybuffer.c
@@ -208,56 +208,156 @@ u32 flip_u32(u32 value, unsigned int num)
 	return c;
 }
 
-char* buf_to_char(u8 *buf, int size)
+int ceil_f_to_u32(float x)
 {
-	int char_len = CEIL(size, 8) * 2;
-	char *char_buf = malloc(char_len + 1);
-	int i;
-	int bits_left = size;
+	u32 y;
+	
+	if (x < 0)	/* return zero for negative numbers */
+		return 0;
 	
-	char_buf[char_len] = 0;
+	y = x;	/* cut off fraction */
 	
-	for (i = 0; i < CEIL(size, 8); i++)
+	if ((x - y) > 0.0) /* if there was a fractional part, increase by one */
+		y++;
+	
+	return y;
+}
+
+char* buf_to_str(u8 *buf, int buf_len, int radix)
+{
+	const char *DIGITS = "0123456789abcdef";
+	float factor;
+	char *str;
+	int str_len;
+	int b256_len = CEIL(buf_len, 8);
+	u32 tmp;
+
+	int j; /* base-256 digits */
+	int i; /* output digits (radix) */
+	
+	if (radix == 16)
 	{
-		if (bits_left < 8)
-		{
-			buf[i] &= ((1 << bits_left) - 1);
-		}
-		
-		if (((buf[i] & 0x0f) >= 0) && ((buf[i] & 0x0f) <= 9))
-			char_buf[char_len - 2*i - 1] = '0' + (buf[i] & 0xf);
-		else
-			char_buf[char_len - 2*i - 1] = 'a' + (buf[i] & 0xf) - 10;
-		
-		if (((buf[i] & 0xf0) >> 4 >= 0) && ((buf[i] & 0xf0) >> 4 <= 9))
-			char_buf[char_len - 2*i - 2] = '0' + ((buf[i] & 0xf0) >> 4);
-		else
-			char_buf[char_len - 2*i - 2] = 'a' + ((buf[i] & 0xf0) >> 4) - 10;
-		
+		factor = 2.0;   /* log(256) / log(16) = 2.0 */
 	}
+	else if (radix == 10)
+	{
+		factor = 2.40824;   /* log(256) / log(10) = 2.40824 */
+    }
+	else if (radix == 8)
+	{
+		factor = 2.66667;	/* log(256) / log(8) = 2.66667 */
+	}
+	else
+		return NULL;
+	
+	str_len = ceil_f_to_u32(CEIL(buf_len, 8) * factor);
+	str = calloc(str_len + 1, 1);
+	
+	for (i = b256_len - 1; i >= 0; i--)
+    {
+        tmp = buf[i];
+    	if ((i == (buf_len / 8)) && (buf_len % 8))
+    		tmp &= (0xff >> (8 - (buf_len % 8)));
 
-	return char_buf;
+        for (j = str_len; j > 0; j--)
+        {
+            tmp += (u32)str[j-1] * 256;
+            str[j-1] = (u8)(tmp % radix);
+            tmp /= radix;
+        }
+    }
+    
+    for (j = 0; j < str_len; j++)
+		str[j] = DIGITS[(int)str[j]];
+	
+	return str;
 }
 
-int char_to_buf(char *buf, int len, u8 *bin_buf, int buf_size)
+int str_to_buf(char* str, int str_len, u8 *buf, int buf_len, int radix)
 {
-	int bin_len = CEIL(len, 2);
-	int i;
+	char *charbuf;
+	u32 tmp;
+	float factor;
+	u8 *b256_buf;
+	int b256_len; 
 	
-	if (buf_size < CEIL(bin_len, 8))
-		return 0;
+	int j; /* base-256 digits */
+	int i; /* input digits (ASCII) */
+	
+	if (radix == 0)	
+	{
+		/* identify radix, and skip radix-prefix (0, 0x or 0X) */
+		if ((str[0] == '0') && (str[1] && ((str[1] == 'x') || (str[1] == 'X'))))
+		{
+			radix = 16;
+			str += 2;
+			str_len -= 2;
+		}
+		else if ((str[0] == '0') && (str_len != 1))
+		{
+			radix = 8;
+			str += 1;
+			str_len -= 1;
+		}
+		else
+		{
+			radix = 10;
+		}
+	}
 	
-	if (len % 2)
+	if (radix == 16)
+		factor = 0.5; /* log(16) / log(256) = 0.5 */
+	else if (radix == 10)
+		factor = 0.41524; /* log(10) / log(256) = 0.41524 */
+	else if (radix == 8)
+		factor = 0.375; /* log(8) / log(256) = 0.375 */
+	else
 		return 0;
+
+	/* copy to zero-terminated buffer */
+	charbuf = malloc(str_len + 1);
+	memcpy(charbuf, str, str_len);
+	charbuf[str_len] = '\0';
 	
-	for (i = 0; i < strlen(buf); i++)
-	{
-		u32 tmp;
-		sscanf(buf + 2*i, "%2x", &tmp);
-		bin_buf[i] = tmp & 0xff;
+	/* number of digits in base-256 notation */
+	b256_len = ceil_f_to_u32(str_len * factor);
+	b256_buf = calloc(b256_len, 1);
+		
+	/* go through zero terminated buffer */
+	for (i = 0; charbuf[i]; i++)
+	{ 
+		tmp = charbuf[i];
+        if ((tmp >= '0') && (tmp <= '9'))
+        	tmp = (tmp - '0');
+        else if ((tmp >= 'a') && (tmp <= 'f'))
+        	tmp = (tmp - 'a' + 10);
+        else if ((tmp >= 'A') && (tmp <= 'F'))
+        	tmp = (tmp - 'A' + 10);
+        else continue;	/* skip characters other than [0-9,a-f,A-F] */
+		
+		if (tmp >= radix)
+			continue;	/* skip digits invalid for the current radix */ 
+		
+		for (j = 0; j < b256_len; j++)
+        {
+            tmp += (u32)b256_buf[j] * radix;
+            b256_buf[j] = (u8)(tmp & 0xFF);
+            tmp >>= 8;
+        }
+		
 	}
 	
-	return bin_len * 8;
+	for (j = 0; j < CEIL(buf_len, 8); j++)
+		buf[j] = b256_buf[j];
+
+	/* mask out bits that don't belong to the buffer */
+	if (buf_len % 8)
+		buf[(buf_len / 8)] &= 0xff >> (8 - (buf_len % 8));
+		
+	free(b256_buf);
+	free(charbuf);
+	
+	return i;
 }
 
 int buf_to_u32_handler(u8 *in_buf, void *priv)
diff --git a/src/helper/binarybuffer.h b/src/helper/binarybuffer.h
index 0a6889450..6f39e7cf4 100644
--- a/src/helper/binarybuffer.h
+++ b/src/helper/binarybuffer.h
@@ -38,8 +38,8 @@ extern u8* buf_cpy(u8 *from, u8 *to, int size);
 extern u8* buf_set_ones(u8 *buf, int count);
 extern u8* buf_set_buf(u8 *src, int src_start, u8 *dst, int dst_start, int len);
 
-extern char* buf_to_char(u8 *buf, int size);
-extern int char_to_buf(char *buf, int len, u8 *bin_buf, int buf_size);
+extern int str_to_buf(char* str, int len, u8 *bin_buf, int buf_size, int radix);
+extern char* buf_to_str(u8 *buf, int size, int radix);
 
 extern int buf_to_u32_handler(u8 *in_buf, void *priv);
 
diff --git a/src/helper/interpreter.c b/src/helper/interpreter.c
index 17d24b1fe..7b0432abc 100644
--- a/src/helper/interpreter.c
+++ b/src/helper/interpreter.c
@@ -126,7 +126,7 @@ int handle_var_command(struct command_context_s *cmd_ctx, char *cmd, char **args
 			last_var_p = &((*last_var_p)->next);
 		}
 
-		if ((args[0][0] >= 0) && (args[0][0] <= 9))
+		if ((args[0][0] >= '0') && (args[0][0] <= '9'))
 		{
 			command_print(cmd_ctx, "invalid name specified (first character may not be a number)");
 			return ERROR_OK;
diff --git a/src/jtag/jtag.c b/src/jtag/jtag.c
index b05f19d99..5ae746216 100644
--- a/src/jtag/jtag.c
+++ b/src/jtag/jtag.c
@@ -958,12 +958,14 @@ int jtag_build_buffer(scan_command_t *cmd, u8 **buffer)
 	{
 		if (cmd->fields[i].out_value)
 		{
-			char* char_buf = buf_to_char(cmd->fields[i].out_value, cmd->fields[i].num_bits);
-			buf_set_buf(cmd->fields[i].out_value, 0, *buffer, bit_count, cmd->fields[i].num_bits);
 #ifdef _DEBUG_JTAG_IO_
-			DEBUG("fields[%i].out_value: %s", i, char_buf);
+			char* char_buf = buf_to_str(cmd->fields[i].out_value, cmd->fields[i].num_bits, 16);
 #endif
+			buf_set_buf(cmd->fields[i].out_value, 0, *buffer, bit_count, cmd->fields[i].num_bits);
+#ifdef _DEBUG_JTAG_IO_
+			DEBUG("fields[%i].out_value: 0x%s", i, char_buf);
 			free(char_buf);
+#endif
 		}
 		
 		bit_count += cmd->fields[i].num_bits;
@@ -991,8 +993,8 @@ int jtag_read_buffer(u8 *buffer, scan_command_t *cmd)
 			#ifdef _DEBUG_JTAG_IO_
 				char *char_buf;
 
-				char_buf = buf_to_char(captured, num_bits);
-				DEBUG("fields[%i].in_value: %s", i, char_buf);
+				char_buf = buf_to_str(captured, num_bits, 16);
+				DEBUG("fields[%i].in_value: 0x%s", i, char_buf);
 				free(char_buf);
 			#endif
 
@@ -1030,11 +1032,11 @@ int jtag_read_buffer(u8 *buffer, scan_command_t *cmd)
 				if ((cmd->fields[i].in_check_mask && buf_cmp_mask(captured, cmd->fields[i].in_check_value, cmd->fields[i].in_check_mask, num_bits))
 					|| (!cmd->fields[i].in_check_mask && buf_cmp(captured, cmd->fields[i].in_check_mask, num_bits)))
 				{
-					char *captured_char = buf_to_char(captured, num_bits);
-					char *in_check_value_char = buf_to_char(cmd->fields[i].in_check_value, num_bits);
-					char *in_check_mask_char = buf_to_char(cmd->fields[i].in_check_mask, num_bits);
+					char *captured_char = buf_to_str(captured, num_bits, 16);
+					char *in_check_value_char = buf_to_str(cmd->fields[i].in_check_value, num_bits, 16);
+					char *in_check_mask_char = buf_to_str(cmd->fields[i].in_check_mask, num_bits, 16);
 					/* TODO: error reporting */
-					WARNING("value captured during scan didn't pass the requested check: captured: %s check_value: %s check_mask: %s", captured_char, in_check_value_char, in_check_mask_char);
+					WARNING("value captured during scan didn't pass the requested check: captured: 0x%s check_value: 0x%s check_mask: 0x%s", captured_char, in_check_value_char, in_check_mask_char);
 					retval = ERROR_JTAG_QUEUE_FAILED;
 					free(captured_char);
 					free(in_check_value_char);
@@ -1144,8 +1146,8 @@ int jtag_validate_chain()
 	{
 		if (buf_get_u32(ir_test, chain_pos, 2) != 0x1)
 		{
-			char *cbuf = buf_to_char(ir_test, total_ir_length);
-			ERROR("Error validating JTAG scan chain, IR mismatch, scan returned %s", cbuf);
+			char *cbuf = buf_to_str(ir_test, total_ir_length, 16);
+			ERROR("Error validating JTAG scan chain, IR mismatch, scan returned 0x%s", cbuf);
 			free(cbuf);
 			exit(-1);
 		}
@@ -1155,8 +1157,8 @@ int jtag_validate_chain()
 	
 	if (buf_get_u32(ir_test, chain_pos, 2) != 0x3)
 	{
-		char *cbuf = buf_to_char(ir_test, total_ir_length);
-		ERROR("Error validating JTAG scan chain, IR mismatch, scan returned %s", cbuf);
+		char *cbuf = buf_to_str(ir_test, total_ir_length, 16);
+		ERROR("Error validating JTAG scan chain, IR mismatch, scan returned 0x%s", cbuf);
 		free(cbuf);
 		exit(-1);
 	}
diff --git a/src/server/gdb_server.c b/src/server/gdb_server.c
index c0a2fe84b..5bbb446be 100644
--- a/src/server/gdb_server.c
+++ b/src/server/gdb_server.c
@@ -464,6 +464,13 @@ int gdb_connection_closed(connection_t *connection)
 	return ERROR_OK;
 }
 
+void gdb_send_error(connection_t *connection, u8 the_error)
+{
+    char err[4];
+    snprintf(err, 4, "E%2.2X", the_error );
+    gdb_put_packet(connection, err, 3);
+}
+
 int gdb_last_signal_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
 {
 	char sig_reply[4];
@@ -477,7 +484,63 @@ int gdb_last_signal_packet(connection_t *connection, target_t *target, char* pac
 	return ERROR_OK;
 }
 
-void gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
+void gdb_str_to_target(target_t *target, char *str, char *tstr)
+{
+	int str_len = strlen(str);
+	int i;
+	
+	if (str_len % 2)
+	{
+		ERROR("BUG: gdb value with uneven number of characters encountered");
+		exit(-1);
+	}
+	
+	if (target->endianness == TARGET_LITTLE_ENDIAN)
+	{
+		for (i = 0; i < str_len; i+=2)
+		{
+			tstr[str_len - i - 1] = str[i + 1];
+			tstr[str_len - i - 2] = str[i];
+		}
+	}
+	else
+	{
+		for (i = 0; i < str_len; i++)
+		{
+			tstr[i] = str[i];
+		}
+	}	
+}
+
+void gdb_target_to_str(target_t *target, char *tstr, char *str)
+{
+	int str_len = strlen(tstr);
+	int i;
+
+	if (str_len % 2)
+	{
+		ERROR("BUG: gdb value with uneven number of characters encountered");
+		exit(-1);
+	}
+	
+	if (target->endianness == TARGET_LITTLE_ENDIAN)
+	{
+		for (i = 0; i < str_len; i+=2)
+		{
+			str[str_len - i - 1] = tstr[i + 1];
+			str[str_len - i - 2] = tstr[i];
+		}
+	}
+	else
+	{
+		for (i = 0; i < str_len; i++)
+		{
+			str[i] = tstr[i];
+		}
+	}	
+}
+
+int gdb_get_registers_packet(connection_t *connection, target_t *target, char* packet, int packet_size)
 {
 	reg_t **reg_list;
 	int reg_list_size;
@@ -494,9 +557,10 @@ void gdb_get_registers_packet(connection_t *connection, target_t *target, char*
 		switch (retval)
 		{
 			case ERROR_TARGET_NOT_HALTED:
-				ERROR("gdb requested registers, but we're not halted");
-				exit(-1);
+				ERROR("gdb requested registers but we're not halted, dropping connection");
+				return ERROR_SERVER_REMOTE_CLOSED;
 			default:
+				/* this is a bug condition - get_gdb_reg_list() may not return any other error */
 				ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 				exit(-1);
 		}
@@ -512,14 +576,10 @@ void gdb_get_registers_packet(connection_t *connection, target_t *target, char*
 	
 	for (i = 0; i < reg_list_size; i++)
 	{
-		int j;
-		char *hex_buf = buf_to_char(reg_list[i]->value, reg_list[i]->size);
+		char *hex_buf = buf_to_str(reg_list[i]->value, reg_list[i]->size, 16);
 		DEBUG("hex_buf: %s", hex_buf);
-		for (j = CEIL(reg_list[i]->size, 8) * 2; j > 0; j -= 2)
-		{
-			*reg_packet_p++ = hex_buf[j - 2];
-			*reg_packet_p++ = hex_buf[j - 1];
-		}
+		gdb_str_to_target(target, hex_buf, reg_packet_p);
+		reg_packet_p += CEIL(reg_list[i]->size, 8) * 2;
 		free(hex_buf);
 	}
 
@@ -530,9 +590,12 @@ void gdb_get_registers_packet(connection_t *connection, target_t *target, char*
 	gdb_put_packet(connection, reg_packet, CEIL(reg_packet_size, 8) * 2);
 	free(reg_packet);
 	
+	free(reg_list);
+	
+	return ERROR_OK;
 }
 
-void gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_set_registers_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 {
 	int i;
 	reg_t **reg_list;
@@ -548,8 +611,8 @@ void gdb_set_registers_packet(connection_t *connection, target_t *target, char *
 
 	if (packet_size % 2)
 	{
-		WARNING("GDB set_registers packet with uneven characters received");
-		return;
+		WARNING("GDB set_registers packet with uneven characters received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
 	}
 
 	if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
@@ -557,9 +620,10 @@ void gdb_set_registers_packet(connection_t *connection, target_t *target, char *
 		switch (retval)
 		{
 			case ERROR_TARGET_NOT_HALTED:
-				ERROR("gdb requested registers, but we're not halted");
-				exit(-1);
+				ERROR("gdb tried to registers but we're not halted, dropping connection");
+				return ERROR_SERVER_REMOTE_CLOSED;
 			default:
+				/* this is a bug condition - get_gdb_reg_list() may not return any other error */
 				ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 				exit(-1);
 		}
@@ -568,23 +632,50 @@ void gdb_set_registers_packet(connection_t *connection, target_t *target, char *
 	packet_p = packet;
 	for (i = 0; i < reg_list_size; i++)
 	{
-		char_to_buf(packet, CEIL(reg_list[i]->size, 8) * 2, reg_list[i]->value, reg_list[i]->size);
-		reg_list[i]->dirty = 1;
+		u8 *bin_buf;
+		char *hex_buf;
+		reg_arch_type_t *arch_type;
+		
+		/* convert from GDB-string (target-endian) to hex-string (big-endian) */
+		hex_buf = malloc(CEIL(reg_list[i]->size, 8) * 2);
+		gdb_target_to_str(target, packet_p, hex_buf);
+		
+		/* convert hex-string to binary buffer */
+		bin_buf = malloc(CEIL(reg_list[i]->size, 8));
+		str_to_buf(hex_buf, CEIL(reg_list[i]->size, 8) * 2, bin_buf, reg_list[i]->size, 16);
+
+		/* get register arch_type, and call set method */	
+		arch_type = register_get_arch_type(reg_list[i]->arch_type);
+		if (arch_type == NULL)
+		{
+			ERROR("BUG: encountered unregistered arch type");
+			exit(-1);
+		}
+		arch_type->set(reg_list[i], bin_buf);
+
+		/* advance packet pointer */		
+		packet_p += (CEIL(reg_list[i]->size, 8) * 2);
+		
+		free(bin_buf);
+		free(hex_buf);
 	}
+	
+	/* free reg_t *reg_list[] array allocated by get_gdb_reg_list */ 
+	free(reg_list);
 
 	gdb_put_packet(connection, "OK", 2);
+	
+	return ERROR_OK;
 }
 
-void gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_get_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 {
-	char *hex_buf;
 	char *reg_packet;
-	char *reg_packet_p;
 	int reg_num = strtoul(packet + 1, NULL, 16);
 	reg_t **reg_list;
 	int reg_list_size;
 	int retval;
-	int i;
+	char *hex_buf;
 	
 	DEBUG("");
 	
@@ -593,9 +684,10 @@ void gdb_get_register_packet(connection_t *connection, target_t *target, char *p
 		switch (retval)
 		{
 			case ERROR_TARGET_NOT_HALTED:
-				ERROR("gdb requested registers, but we're not halted");
-				exit(-1);
+				ERROR("gdb requested registers but we're not halted, dropping connection");
+				return ERROR_SERVER_REMOTE_CLOSED;
 			default:
+				/* this is a bug condition - get_gdb_reg_list() may not return any other error */
 				ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 				exit(-1);
 		}
@@ -607,30 +699,32 @@ void gdb_get_register_packet(connection_t *connection, target_t *target, char *p
 		exit(-1);
 	}
 
-	hex_buf = buf_to_char(reg_list[reg_num]->value, reg_list[reg_num]->size);
-	reg_packet = reg_packet_p = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
+	reg_packet = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
+
+	hex_buf = buf_to_str(reg_list[reg_num]->value, reg_list[reg_num]->size, 16);
 	
-	for (i = CEIL(reg_list[reg_num]->size, 8) * 2; i > 0; i -= 2)
-	{
-		*reg_packet_p++ = hex_buf[i - 2];
-		*reg_packet_p++ = hex_buf[i - 1];
-	}
+	gdb_str_to_target(target, reg_packet, hex_buf);
 	
 	gdb_put_packet(connection, reg_packet, CEIL(reg_list[reg_num]->size, 8) * 2);
 	
+	free(reg_list);
 	free(reg_packet);
 	free(hex_buf);
 	
+	return ERROR_OK;
 }
 
-void gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_set_register_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 {
 	char *separator;
+	char *hex_buf;
+	u8 *bin_buf;
 	int reg_num = strtoul(packet + 1, &separator, 16);
 	reg_t **reg_list;
 	int reg_list_size;
 	int retval;
-
+	reg_arch_type_t *arch_type;
+	
 	DEBUG("");
 	
 	if ((retval = target->type->get_gdb_reg_list(target, &reg_list, &reg_list_size)) != ERROR_OK)
@@ -638,9 +732,10 @@ void gdb_set_register_packet(connection_t *connection, target_t *target, char *p
 		switch (retval)
 		{
 			case ERROR_TARGET_NOT_HALTED:
-				ERROR("gdb requested registers, but we're not halted");
-				exit(-1);
+				ERROR("gdb tried to set a register but we're not halted, dropping connection");
+				return ERROR_SERVER_REMOTE_CLOSED;
 			default:
+				/* this is a bug condition - get_gdb_reg_list() may not return any other error */
 				ERROR("BUG: unexpected error returned by get_gdb_reg_list()");
 				exit(-1);
 		}
@@ -649,23 +744,67 @@ void gdb_set_register_packet(connection_t *connection, target_t *target, char *p
 	if (reg_list_size < reg_num)
 	{
 		ERROR("gdb requested a non-existing register");
-		exit(-1);
+		return ERROR_SERVER_REMOTE_CLOSED;
 	}
 
 	if (*separator != '=')
 	{
-		ERROR("GDB set register packet, but no '=' following the register number");
-		exit(-1);
+		ERROR("GDB 'set register packet', but no '=' following the register number");
+		return ERROR_SERVER_REMOTE_CLOSED;
 	}
 	
-	char_to_buf(separator + 1, CEIL(reg_list[reg_num]->size, 8) * 2, reg_list[reg_num]->value, reg_list[reg_num]->size);
-	reg_list[reg_num]->dirty = 1;
+	/* convert from GDB-string (target-endian) to hex-string (big-endian) */
+	hex_buf = malloc(CEIL(reg_list[reg_num]->size, 8) * 2);
+	gdb_target_to_str(target, separator + 1, hex_buf);
+	
+	/* convert hex-string to binary buffer */
+	bin_buf = malloc(CEIL(reg_list[reg_num]->size, 8));
+	str_to_buf(hex_buf, CEIL(reg_list[reg_num]->size, 8) * 2, bin_buf, reg_list[reg_num]->size, 16);
+
+	/* get register arch_type, and call set method */	
+	arch_type = register_get_arch_type(reg_list[reg_num]->arch_type);
+	if (arch_type == NULL)
+	{
+		ERROR("BUG: encountered unregistered arch type");
+		exit(-1);
+	}
+	arch_type->set(reg_list[reg_num], bin_buf);
 
 	gdb_put_packet(connection, "OK", 2);
 
+	free(bin_buf);
+	free(hex_buf);
+	free(reg_list);
+
+	return ERROR_OK;
 }
 
-void gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_memory_packet_error(connection_t *connection, int retval)
+{
+	switch (retval)
+	{
+		case ERROR_TARGET_NOT_HALTED:
+			ERROR("gdb tried to read memory but we're not halted, dropping connection");
+			return ERROR_SERVER_REMOTE_CLOSED;
+			break;
+		case ERROR_TARGET_DATA_ABORT:
+			gdb_send_error(connection, EIO);
+			break;
+		case ERROR_TARGET_TRANSLATION_FAULT:
+			gdb_send_error(connection, EFAULT);
+			break;
+		case ERROR_TARGET_UNALIGNED_ACCESS:
+			gdb_send_error(connection, EFAULT);
+			break;
+		default:
+			ERROR("BUG: unexpected error %i", retval);
+			exit(-1);
+	}
+	
+	return ERROR_OK;
+}
+
+int gdb_read_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 {
 	char *separator;
 	u32 addr = 0;
@@ -675,6 +814,7 @@ void gdb_read_memory_packet(connection_t *connection, target_t *target, char *pa
 	char *hex_buffer;
 
 	int i;
+	int retval;
 
 	/* skip command character */
 	packet++;
@@ -682,7 +822,10 @@ void gdb_read_memory_packet(connection_t *connection, target_t *target, char *pa
 	addr = strtoul(packet, &separator, 16);
 	
 	if (*separator != ',')
-		return;
+	{
+		ERROR("incomplete read memory packet received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
 
 	len = strtoul(separator+1, NULL, 16);
 
@@ -694,35 +837,46 @@ void gdb_read_memory_packet(connection_t *connection, target_t *target, char *pa
 	{
 		case 4:
 			if ((addr % 4) == 0)
-				target->type->read_memory(target, addr, 4, 1, buffer);
+				retval = target->type->read_memory(target, addr, 4, 1, buffer);
 			else
-				target->type->read_memory(target, addr, 1, len, buffer);
+				retval = target->type->read_memory(target, addr, 1, len, buffer);
 			break;
 		case 2:
 			if ((addr % 2) == 0)
-				target->type->read_memory(target, addr, 2, 1, buffer);
+				retval = target->type->read_memory(target, addr, 2, 1, buffer);
 			else
-				target->type->read_memory(target, addr, 1, len, buffer);
+				retval = target->type->read_memory(target, addr, 1, len, buffer);
 			break;
 		default:
 			if (((addr % 4) == 0) && ((len % 4) == 0))
-				target->type->read_memory(target, addr, 4, len / 4, buffer);
+				retval = target->type->read_memory(target, addr, 4, len / 4, buffer);
 			else
-				target->type->read_memory(target, addr, 1, len, buffer);
+				retval = target->type->read_memory(target, addr, 1, len, buffer);
 	}
 
-	hex_buffer = malloc(len * 2 + 1);
+	if (retval == ERROR_OK)
+	{
+		hex_buffer = malloc(len * 2 + 1);
+		
+		for (i=0; i<len; i++)
+			snprintf(hex_buffer + 2*i, 3, "%2.2x", buffer[i]);
 	
-	for (i=0; i<len; i++)
-		snprintf(hex_buffer + 2*i, 3, "%2.2x", buffer[i]);
-
-	gdb_put_packet(connection, hex_buffer, len * 2);
+		gdb_put_packet(connection, hex_buffer, len * 2);
 	
-	free(hex_buffer);
+		free(hex_buffer);
+	}
+	else
+	{
+		if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
+			return retval; 
+	}
+
 	free(buffer);
+	
+	return ERROR_OK;
 }
 
-void gdb_write_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_write_memory_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 {
 	char *separator;
 	u32 addr = 0;
@@ -731,6 +885,7 @@ void gdb_write_memory_packet(connection_t *connection, target_t *target, char *p
 	u8 *buffer;
 
 	int i;
+	int retval;
 
 	/* skip command character */
 	packet++;
@@ -738,12 +893,18 @@ void gdb_write_memory_packet(connection_t *connection, target_t *target, char *p
 	addr = strtoul(packet, &separator, 16);
 	
 	if (*separator != ',')
-		return;
+	{
+		ERROR("incomplete write memory packet received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
 
 	len = strtoul(separator+1, &separator, 16);
 
 	if (*(separator++) != ':')
-		return;
+	{
+		ERROR("incomplete write memory packet received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
 
 	buffer = malloc(len);
 
@@ -761,38 +922,49 @@ void gdb_write_memory_packet(connection_t *connection, target_t *target, char *p
 		/* handle sized writes */
 		case 4:
 			if ((addr % 4) == 0)
-				target->type->write_memory(target, addr, 4, 1, buffer);
+				retval = target->type->write_memory(target, addr, 4, 1, buffer);
 			else
-				target->type->write_memory(target, addr, 1, len, buffer);
+				retval = target->type->write_memory(target, addr, 1, len, buffer);
 			break;
 		case 2:
 			if ((addr % 2) == 0)
-				target->type->write_memory(target, addr, 2, 1, buffer);
+				retval = target->type->write_memory(target, addr, 2, 1, buffer);
 			else
-				target->type->write_memory(target, addr, 1, len, buffer);
+				retval = target->type->write_memory(target, addr, 1, len, buffer);
 			break;
 		case 3:
 		case 1:
-			target->type->write_memory(target, addr, 1, len, buffer);
+			retval = target->type->write_memory(target, addr, 1, len, buffer);
 			break;
 		/* handle bulk writes */
 		default:
-			target_write_buffer(target, addr, len, buffer);
+			retval = target_write_buffer(target, addr, len, buffer);
 			break;
 	}
 
-	gdb_put_packet(connection, "OK", 2);
+	if (retval == ERROR_OK)
+	{
+		gdb_put_packet(connection, "OK", 2);
+	}
+	else
+	{
+		if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
+			return retval; 
+	}
 	
 	free(buffer);
+	
+	return ERROR_OK;
 }
 
-void gdb_write_memory_binary_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_write_memory_binary_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 {
 	char *separator;
 	u32 addr = 0;
 	u32 len = 0;
 
 	u8 *buffer;
+	int retval;
 
 	/* skip command character */
 	packet++;
@@ -800,12 +972,18 @@ void gdb_write_memory_binary_packet(connection_t *connection, target_t *target,
 	addr = strtoul(packet, &separator, 16);
 	
 	if (*separator != ',')
-		return;
+	{
+		ERROR("incomplete write memory binary packet received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
 
 	len = strtoul(separator+1, &separator, 16);
 
 	if (*(separator++) != ':')
-		return;
+	{
+		ERROR("incomplete write memory binary packet received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
 
 	if( len ) {
 		
@@ -819,29 +997,39 @@ void gdb_write_memory_binary_packet(connection_t *connection, target_t *target,
 		{
 			case 4:
 				if ((addr % 4) == 0)
-					target->type->write_memory(target, addr, 4, 1, buffer);
+					retval = target->type->write_memory(target, addr, 4, 1, buffer);
 				else
-					target->type->write_memory(target, addr, 1, len, buffer);
+					retval = target->type->write_memory(target, addr, 1, len, buffer);
 				break;
 			case 2:
 				if ((addr % 2) == 0)
-					target->type->write_memory(target, addr, 2, 1, buffer);
+					retval = target->type->write_memory(target, addr, 2, 1, buffer);
 				else
-					target->type->write_memory(target, addr, 1, len, buffer);
+					retval = target->type->write_memory(target, addr, 1, len, buffer);
 				break;
 			case 3:
 			case 1:
-				target->type->write_memory(target, addr, 1, len, buffer);
+				retval = target->type->write_memory(target, addr, 1, len, buffer);
 				break;
 			default:
-				target_write_buffer(target, addr, len, buffer);
+				retval = target_write_buffer(target, addr, len, buffer);
 				break;
 		}
 		
 		free(buffer);
 	}
 
-	gdb_put_packet(connection, "OK", 2);
+	if (retval == ERROR_OK)
+	{
+		gdb_put_packet(connection, "OK", 2);
+	}
+	else
+	{
+		if ((retval = gdb_memory_packet_error(connection, retval)) != ERROR_OK)
+			return retval; 
+	}
+	
+	return ERROR_OK;
 }
 
 void gdb_step_continue_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
@@ -853,7 +1041,6 @@ void gdb_step_continue_packet(connection_t *connection, target_t *target, char *
 
 	if (packet_size > 1)
 	{
-		u32 address = 0;
 		packet[packet_size] = 0;
 		address = strtoul(packet + 1, NULL, 16);
 	}
@@ -874,7 +1061,26 @@ void gdb_step_continue_packet(connection_t *connection, target_t *target, char *
 	}
 }
 
-void gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
+int gdb_bp_wp_packet_error(connection_t *connection, int retval)
+{
+	switch (retval)
+	{
+		case ERROR_TARGET_NOT_HALTED:
+			ERROR("gdb tried to set a breakpoint but we're not halted, dropping connection");
+			return ERROR_SERVER_REMOTE_CLOSED;
+			break;
+		case ERROR_TARGET_RESOURCE_NOT_AVAILABLE:
+			gdb_send_error(connection, EBUSY);
+			break;
+		default:
+			ERROR("BUG: unexpected error %i", retval);
+			exit(-1);
+	}
+	
+	return ERROR_OK;
+}
+
+int gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target, char *packet, int packet_size)
 {
 	int type;
 	enum breakpoint_type bp_type;
@@ -900,12 +1106,18 @@ void gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target
 		wp_type = WPT_ACCESS;
 		
 	if (*separator != ',')
-		return;
+	{
+		ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
 
 	address = strtoul(separator+1, &separator, 16);
 
 	if (*separator != ',')
-		return;
+	{
+		ERROR("incomplete breakpoint/watchpoint packet received, dropping connection");
+		return ERROR_SERVER_REMOTE_CLOSED;
+	}
 
 	size = strtoul(separator+1, &separator, 16);
 
@@ -917,41 +1129,53 @@ void gdb_breakpoint_watchpoint_packet(connection_t *connection, target_t *target
 			{
 				if ((retval = breakpoint_add(target, address, size, bp_type)) != ERROR_OK)
 				{
-					if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
-					{
-						gdb_put_packet(connection, "E00", 3);
-						break;
-					}
+					if ((retval = gdb_bp_wp_packet_error(connection, retval)) != ERROR_OK)
+						return retval;
+				}
+				else
+				{
+					gdb_put_packet(connection, "OK", 2);
 				}
 			}
 			else
 			{
 				breakpoint_remove(target, address);
+				gdb_put_packet(connection, "OK", 2);
 			}
-			gdb_put_packet(connection, "OK", 2);
 			break;
 		case 2:
 		case 3:
 		case 4:
 		{
 			if (packet[0] == 'Z')
-				watchpoint_add(target, address, size, type-2, 0, 0xffffffffu);
+			{
+				if ((retval = watchpoint_add(target, address, size, type-2, 0, 0xffffffffu)) != ERROR_OK)
+				{
+					if ((retval = gdb_bp_wp_packet_error(connection, retval)) != ERROR_OK)
+						return retval;
+				}
+				else
+				{
+					gdb_put_packet(connection, "OK", 2);
+				}
+			}
 			else
+			{
 				watchpoint_remove(target, address);
-			gdb_put_packet(connection, "OK", 2);
+				gdb_put_packet(connection, "OK", 2);
+			}
 			break;
 		}
 		default:
 			break;
 	}
 
+	return ERROR_OK;
 }
 
 void gdb_query_packet(connection_t *connection, char *packet, int packet_size)
 {
 	command_context_t *cmd_ctx = connection->cmd_ctx;
-	gdb_service_t *gdb_service = connection->service->priv;
-	target_t *target = gdb_service->target;
 
 	if (strstr(packet, "qRcmd,"))
 	{
@@ -1000,7 +1224,7 @@ int gdb_input(connection_t *connection)
 				case ERROR_SERVER_REMOTE_CLOSED:
 					return ERROR_SERVER_REMOTE_CLOSED;
 				default:
-					ERROR("unexpected error");
+					ERROR("BUG: unexpected error");
 					exit(-1);
 			}
 		}
@@ -1012,6 +1236,7 @@ int gdb_input(connection_t *connection)
 		
 		if (packet_size > 0)
 		{
+			retval = ERROR_OK;
 			switch (packet[0])
 			{
 				case 'H':
@@ -1023,26 +1248,26 @@ int gdb_input(connection_t *connection)
 					gdb_query_packet(connection, packet, packet_size);
 					break;
 				case 'g':
-					gdb_get_registers_packet(connection, target, packet, packet_size);
+					retval = gdb_get_registers_packet(connection, target, packet, packet_size);
 					break;
 				case 'G':
-					gdb_set_registers_packet(connection, target, packet, packet_size);
+					retval = gdb_set_registers_packet(connection, target, packet, packet_size);
 					break;
 				case 'p':
-					gdb_get_register_packet(connection, target, packet, packet_size);
+					retval = gdb_get_register_packet(connection, target, packet, packet_size);
 					break;
 				case 'P':
-					gdb_set_register_packet(connection, target, packet, packet_size);
+					retval = gdb_set_register_packet(connection, target, packet, packet_size);
 					break;
 				case 'm':
-					gdb_read_memory_packet(connection, target, packet, packet_size);
+					retval = gdb_read_memory_packet(connection, target, packet, packet_size);
 					break;
 				case 'M':
-					gdb_write_memory_packet(connection, target, packet, packet_size);
+					retval = gdb_write_memory_packet(connection, target, packet, packet_size);
 					break;
 				case 'z':
 				case 'Z':
-					gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
+					retval = gdb_breakpoint_watchpoint_packet(connection, target, packet, packet_size);
 					break;
 				case '?':
 					gdb_last_signal_packet(connection, target, packet, packet_size);
@@ -1056,7 +1281,8 @@ int gdb_input(connection_t *connection)
 					gdb_put_packet(connection, "OK", 2);
 					break;
 				case 'X':
-					gdb_write_memory_binary_packet(connection, target, packet, packet_size);
+					if ((retval = gdb_write_memory_binary_packet(connection, target, packet, packet_size)) != ERROR_OK)
+						return retval;
 					break;
 				case 'k':
 					gdb_put_packet(connection, "OK", 2);
@@ -1067,6 +1293,10 @@ int gdb_input(connection_t *connection)
 					gdb_put_packet(connection, NULL, 0);
 					break;
 			}
+			
+			/* if a packet handler returned an error, exit input loop */
+			if (retval != ERROR_OK)
+				return retval;
 		}
 				
 		if (gdb_con->ctrl_c)
diff --git a/src/target/arm966e.c b/src/target/arm966e.c
index b7cfea805..f5f4a209f 100644
--- a/src/target/arm966e.c
+++ b/src/target/arm966e.c
@@ -70,6 +70,8 @@ target_type_t arm966e_target =
 	.write_memory = arm7_9_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 
+	.run_algorithm = armv4_5_run_algorithm,
+	
 	.add_breakpoint = arm7_9_add_breakpoint,
 	.remove_breakpoint = arm7_9_remove_breakpoint,
 	.add_watchpoint = arm7_9_add_watchpoint,
diff --git a/src/target/arm9tdmi.c b/src/target/arm9tdmi.c
index 7584a8bbd..ccd30312d 100644
--- a/src/target/arm9tdmi.c
+++ b/src/target/arm9tdmi.c
@@ -68,6 +68,8 @@ target_type_t arm9tdmi_target =
 	.write_memory = arm7_9_write_memory,
 	.bulk_write_memory = arm7_9_bulk_write_memory,
 
+	.run_algorithm = armv4_5_run_algorithm,
+	
 	.add_breakpoint = arm7_9_add_breakpoint,
 	.remove_breakpoint = arm7_9_remove_breakpoint,
 	.add_watchpoint = arm7_9_add_watchpoint,
diff --git a/src/target/armv4_5.c b/src/target/armv4_5.c
index 86d5dc89d..00fb2f078 100644
--- a/src/target/armv4_5.c
+++ b/src/target/armv4_5.c
@@ -223,16 +223,42 @@ int armv4_5_get_core_reg(reg_t *reg)
 	return retval;
 }
 
-int armv4_5_set_core_reg(reg_t *reg, u32 value)
+int armv4_5_set_core_reg(reg_t *reg, u8 *buf)
 {
 	armv4_5_core_reg_t *armv4_5 = reg->arch_info;
 	target_t *target = armv4_5->target;
+	armv4_5_common_t *armv4_5_target = target->arch_info;
+	u32 value = buf_get_u32(buf, 0, 32);
 		
 	if (target->state != TARGET_HALTED)
 	{
 		return ERROR_TARGET_NOT_HALTED;
 	}
 	
+	if (reg == &armv4_5_target->core_cache->reg_list[ARMV4_5_CPSR])
+	{
+		if (value & 0x20)
+		{
+			/* T bit should be set */
+			if (armv4_5_target->core_state == ARMV4_5_STATE_ARM)
+			{
+				/* change state to Thumb */
+				DEBUG("changing to Thumb state");
+				armv4_5_target->core_state = ARMV4_5_STATE_THUMB;	
+			}
+		}
+		else
+		{
+			/* T bit should be cleared */
+			if (armv4_5_target->core_state == ARMV4_5_STATE_THUMB)
+			{
+				/* change state to ARM */
+				DEBUG("changing to ARM state");
+				armv4_5_target->core_state = ARMV4_5_STATE_ARM;	
+			}
+		}
+	}
+	
 	buf_set_u32(reg->value, 0, 32, value);
 	reg->dirty = 1;
 	reg->valid = 1;
@@ -518,7 +544,7 @@ int armv4_5_run_algorithm(struct target_s *target, int num_mem_params, mem_param
 			exit(-1);
 		}
 		
-		armv4_5_set_core_reg(reg, buf_get_u32(reg_params[i].value, 0, 32));
+		armv4_5_set_core_reg(reg, reg_params[i].value);
 	}
 	
 	armv4_5->core_state = armv4_5_algorithm_info->core_state;
diff --git a/src/target/embeddedice.c b/src/target/embeddedice.c
index 0cb4e0170..b063bd2c3 100644
--- a/src/target/embeddedice.c
+++ b/src/target/embeddedice.c
@@ -78,6 +78,7 @@ int embeddedice_reg_arch_type = -1;
 
 int embeddedice_get_reg(reg_t *reg);
 int embeddedice_set_reg(reg_t *reg, u32 value);
+int embeddedice_set_reg_w_exec(reg_t *reg, u8 *buf);
 
 int embeddedice_write_reg(reg_t *reg, u32 value);
 int embeddedice_read_reg(reg_t *reg);
@@ -231,9 +232,9 @@ int embeddedice_set_reg(reg_t *reg, u32 value)
 	return ERROR_OK;
 }
 
-int embeddedice_set_reg_w_exec(reg_t *reg, u32 value)
+int embeddedice_set_reg_w_exec(reg_t *reg, u8 *buf)
 {
-	embeddedice_set_reg(reg, value);
+	embeddedice_set_reg(reg, buf_get_u32(buf, 0, reg->size));
 	
 	if (jtag_execute_queue() != ERROR_OK)
 	{
diff --git a/src/target/embeddedice.h b/src/target/embeddedice.h
index 8631e7b93..eedc21912 100644
--- a/src/target/embeddedice.h
+++ b/src/target/embeddedice.h
@@ -95,6 +95,6 @@ extern int embeddedice_write_reg(reg_t *reg, u32 value);
 extern int embeddedice_read_reg_w_check(reg_t *reg, u8* check_value, u8* check_mask);
 extern int embeddedice_store_reg(reg_t *reg);
 extern int embeddedice_set_reg(reg_t *reg, u32 value);
-extern int embeddedice_set_reg_w_exec(reg_t *reg, u32 value);
+extern int embeddedice_set_reg_w_exec(reg_t *reg, u8 *buf);
 
 #endif /* EMBEDDED_ICE_H */
diff --git a/src/target/etm.c b/src/target/etm.c
index a6b63451d..9c82acc92 100644
--- a/src/target/etm.c
+++ b/src/target/etm.c
@@ -199,6 +199,7 @@ int etm_reg_arch_type = -1;
 
 int etm_get_reg(reg_t *reg);
 int etm_set_reg(reg_t *reg, u32 value);
+int etm_set_reg_w_exec(reg_t *reg, u8 *buf);
 
 int etm_write_reg(reg_t *reg, u32 value);
 int etm_read_reg(reg_t *reg);
@@ -338,9 +339,9 @@ int etm_set_reg(reg_t *reg, u32 value)
 	return ERROR_OK;
 }
 
-int etm_set_reg_w_exec(reg_t *reg, u32 value)
+int etm_set_reg_w_exec(reg_t *reg, u8 *buf)
 {
-	etm_set_reg(reg, value);
+	etm_set_reg(reg, buf_get_u32(buf, 0, reg->size));
 	
 	if (jtag_execute_queue() != ERROR_OK)
 	{
diff --git a/src/target/etm.h b/src/target/etm.h
index dbe78f35e..4b24e5c88 100644
--- a/src/target/etm.h
+++ b/src/target/etm.h
@@ -71,6 +71,6 @@ extern int etm_write_reg(reg_t *reg, u32 value);
 extern int etm_read_reg_w_check(reg_t *reg, u8* check_value, u8* check_mask);
 extern int etm_store_reg(reg_t *reg);
 extern int etm_set_reg(reg_t *reg, u32 value);
-extern int etm_set_reg_w_exec(reg_t *reg, u32 value);
+extern int etm_set_reg_w_exec(reg_t *reg, u8 *buf);
 
 #endif /* ETM_H */
diff --git a/src/target/register.c b/src/target/register.c
index 182ff9a22..2adf73e75 100644
--- a/src/target/register.c
+++ b/src/target/register.c
@@ -66,7 +66,7 @@ reg_cache_t** register_get_last_cache_p(reg_cache_t **first)
 	return cache_p;
 }
 
-int register_reg_arch_type(int (*get)(reg_t *reg), int (*set)(reg_t *reg, u32 value))
+int register_reg_arch_type(int (*get)(reg_t *reg), int (*set)(reg_t *reg, u8 *buf))
 {
 	reg_arch_type_t** arch_type_p = &reg_arch_types;
 	int id = 0;
diff --git a/src/target/register.h b/src/target/register.h
index 8a903eddf..456ab5901 100644
--- a/src/target/register.h
+++ b/src/target/register.h
@@ -56,13 +56,13 @@ typedef struct reg_arch_type_s
 {
 	int id;
 	int (*get)(reg_t *reg);
-	int (*set)(reg_t *reg, u32 value);
+	int (*set)(reg_t *reg, u8 *buf);
 	struct reg_arch_type_s *next;
 } reg_arch_type_t;
 
 extern reg_t* register_get_by_name(reg_cache_t *first, char *name, int search_all);
 extern reg_cache_t** register_get_last_cache_p(reg_cache_t **first);
-extern int register_reg_arch_type(int (*get)(reg_t *reg), int (*set)(reg_t *reg, u32 value));
+extern int register_reg_arch_type(int (*get)(reg_t *reg), int (*set)(reg_t *reg, u8 *buf));
 extern reg_arch_type_t* register_get_arch_type(int id);
 
 #endif /* REGISTER_H */
diff --git a/src/target/target.c b/src/target/target.c
index f1229d86f..531d632e6 100644
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -1085,7 +1085,7 @@ int handle_reg_command(struct command_context_s *cmd_ctx, char *cmd, char **args
 			int i;
 			for (i = 0; i < cache->num_regs; i++)
 			{
-				value = buf_to_char(cache->reg_list[i].value, cache->reg_list[i].size);
+				value = buf_to_str(cache->reg_list[i].value, cache->reg_list[i].size, 16);
 				command_print(cmd_ctx, "(%i) %s (/%i): 0x%s (dirty: %i, valid: %i)", count++, cache->reg_list[i].name, cache->reg_list[i].size, value, cache->reg_list[i].dirty, cache->reg_list[i].valid);
 				free(value);
 			}
@@ -1150,7 +1150,7 @@ int handle_reg_command(struct command_context_s *cmd_ctx, char *cmd, char **args
 			}
 			arch_type->get(reg);
 		}
-		value = buf_to_char(reg->value, reg->size);
+		value = buf_to_str(reg->value, reg->size, 16);
 		command_print(cmd_ctx, "%s (/%i): 0x%s", reg->name, reg->size, value);
 		free(value);
 		return ERROR_OK;
@@ -1159,7 +1159,9 @@ int handle_reg_command(struct command_context_s *cmd_ctx, char *cmd, char **args
 	/* set register value */
 	if (argc == 2)
 	{
-		u32 new_value = strtoul(args[1], NULL, 0);
+		u8 *buf = malloc(CEIL(reg->size, 8));
+		str_to_buf(args[1], strlen(args[1]), buf, reg->size, 0);
+
 		reg_arch_type_t *arch_type = register_get_arch_type(reg->arch_type);
 		if (arch_type == NULL)
 		{
@@ -1167,11 +1169,14 @@ int handle_reg_command(struct command_context_s *cmd_ctx, char *cmd, char **args
 			return ERROR_OK;
 		}
 		
-		arch_type->set(reg, new_value);
-		value = buf_to_char(reg->value, reg->size);
+		arch_type->set(reg, buf);
+		
+		value = buf_to_str(reg->value, reg->size, 16);
 		command_print(cmd_ctx, "%s (/%i): 0x%s", reg->name, reg->size, value);
 		free(value);
 		
+		free(buf);
+		
 		return ERROR_OK;
 	}
 	
@@ -1684,7 +1689,7 @@ int handle_bp_command(struct command_context_s *cmd_ctx, char *cmd, char **args,
 		{
 			if (breakpoint->type == BKPT_SOFT)
 			{
-				char* buf = buf_to_char(breakpoint->orig_instr, breakpoint->length);
+				char* buf = buf_to_str(breakpoint->orig_instr, breakpoint->length, 16);
 				command_print(cmd_ctx, "0x%8.8x, 0x%x, %i, 0x%s", breakpoint->address, breakpoint->length, breakpoint->set, buf);
 				free(buf);
 			}
-- 
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