From 1c28cbab0241b400cc7a7fc2e3f7170b0c7a952e Mon Sep 17 00:00:00 2001
From: oharboe <oharboe@b42882b7-edfa-0310-969c-e2dbd0fdcd60>
Date: Mon, 27 Apr 2009 09:12:18 +0000
Subject: [PATCH] Some devices such as AVR will return 0xffffffff instead of
the TDI data at the end of the chain. Added kludge to handle this.
git-svn-id: svn://svn.berlios.de/openocd/trunk@1537 b42882b7-edfa-0310-969c-e2dbd0fdcd60
---
src/jtag/jtag.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/src/jtag/jtag.c b/src/jtag/jtag.c
index 408f88fa5..59f199163 100644
--- a/src/jtag/jtag.c
+++ b/src/jtag/jtag.c
@@ -1531,7 +1531,9 @@ int jtag_examine_chain(void)
u32 part;
u32 version;
- if (idcode == 0x000000FF)
+ /* some devices, such as AVR will output all 1's instead of TDI
+ input value at end of chain. */
+ if ((idcode == 0x000000FF)||(idcode == 0xFFFFFFFF))
{
int unexpected=0;
/* End of chain (invalid manufacturer ID)
@@ -1548,7 +1550,7 @@ int jtag_examine_chain(void)
for (bit_count += 32; bit_count < (JTAG_MAX_CHAIN_SIZE * 32) - 31;bit_count += 32)
{
idcode = buf_get_u32(idcode_buffer, bit_count, 32);
- if (unexpected||(idcode != 0x000000FF))
+ if (unexpected||((idcode != 0x000000FF)&&(idcode != 0xFFFFFFFF)))
{
LOG_WARNING("Unexpected idcode after end of chain! %d 0x%08x", bit_count, idcode);
unexpected = 1;
@@ -3306,7 +3308,7 @@ tap_state_t jtag_debug_state_machine(const void *tms_buf, const void *tdi_buf,
tap_state_t last_state;
- // set startstate (and possibly last, if tap_bits == 0)
+ // set startstate (and possibly last, if tap_bits == 0)
last_state = next_state;
DEBUG_JTAG_IO("TAP/SM: START state: %s", tap_state_name(next_state));
--
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