Jonas Horberg [jhorberg@sauer-danfoss.com]

https://lists.berlios.de/pipermail/openocd-development/2009-August/009939.html

1. It can only be built with the FTD2XX driver. libftdi supports FT2232H/FT4232H 
since version 0.16 

2. A speed value of 0 is used as a RTCK request indicator. This clashes with the 
valid clock division value 0 that provide the highest fixed clock frequency. 

3. The ft2232_speed_div function return the maximum selectable frequency (30MHz) 
when RTCK is activated. It should return 0. 

4. The ft2232_khz function return ERROR_OK when RTCK is requested even for 
devices lacking RTCK support. It should return ERROR_FAIL so the upper driver layers 
can detect this and try to fallback to a fixed frequency. 

5. FT2232H/FT4232H have a backward compatibility function that divide the clock 
by 5 to get the same frequency range as FT2232D. There is no code that disable 
this functionality. I can not find anything about if this is enabled or disabled by default. 
I think it is safest to actively disable it. 


git-svn-id: svn://svn.berlios.de/openocd/trunk@2591 b42882b7-edfa-0310-969c-e2dbd0fdcd60

README

@@ -215,9 +215,10 @@ options may be available there:
                           FTD2XX
   --enable-ft2232_ftd2xx  Enable building support for FT2232 based devices
                           using the FTD2XX driver from ftdichip.com
-  --enable-ftd2xx-highspeed
+  --enable-ft2232-highspeed
                           Enable building support for FT2232H and
-                          FT4232H-based devices (requires >=libftd2xx-0.4.16)
+                          FT4232H-based devices (requires >=libftd2xx-0.4.16
+                          or >=libftdi-0.16)
 
   --enable-gw16012        Enable building support for the Gateworks GW16012
                           JTAG Programmer

configure.in

@@ -323,9 +323,9 @@ AC_ARG_ENABLE(ft2232_ftd2xx,
   AS_HELP_STRING([--enable-ft2232_ftd2xx], [Enable building support for FT2232 based devices using the FTD2XX driver from ftdichip.com]),
   [build_ft2232_ftd2xx=$enableval], [build_ft2232_ftd2xx=no])
 
-AC_ARG_ENABLE(ftd2xx_highspeed,
-  AS_HELP_STRING([--enable-ftd2xx-highspeed], [Enable building support for FT2232H and FT4232H-based devices (requires >=libftd2xx-0.4.16)]), 
-  [want_ftd2xx_highspeed=$enableval], [want_ftd2xx_highspeed=no])
+AC_ARG_ENABLE(ft2232_highspeed,
+  AS_HELP_STRING([--enable-ft2232-highspeed], [Enable building support for FT2232H and FT4232H-based devices (requires >=libftd2xx-0.4.16 or >=libftdi-0.16)]),
+  [want_ft2232_highspeed=$enableval], [want_ft2232_highspeed=no])
 
 AC_ARG_ENABLE(amtjtagaccel,
   AS_HELP_STRING([--enable-amtjtagaccel], [Enable building the Amontec JTAG-Accelerator driver]),
@@ -835,8 +835,8 @@ main( int argc, char **argv )
   ])
 
 AC_MSG_CHECKING([whether to build ftd2xx highspeed device support])
-AC_MSG_RESULT([$want_ftd2xx_highspeed])
-if test $want_ftd2xx_highspeed != no; then
+AC_MSG_RESULT([$want_ft2232_highspeed])
+if test $want_ft2232_highspeed != no; then
   AC_MSG_CHECKING([for ftd2xx highspeed device support])
   AC_COMPILE_IFELSE([
 #include "confdefs.h"
@@ -847,15 +847,15 @@ if test $want_ftd2xx_highspeed != no; then
 #include <ftd2xx.h>
 DWORD x = FT_DEVICE_4232H;
     ], [
-      AC_DEFINE(BUILD_FTD2XX_HIGHSPEED, [1],
-        [Support FT2232H/FT4232HS with FTD2XX.])
-      build_ftd2xx_highspeed=yes
+      AC_DEFINE(BUILD_FT2232_HIGHSPEED, [1],
+        [Support FT2232H/FT4232HS with FTD2XX or libftdi.])
+      build_ft2232_highspeed=yes
     ], [
-      build_ftd2xx_highspeed=no
+      build_ft2232_highspeed=no
     ])
-  AC_MSG_RESULT([$build_ftd2xx_highspeed])
+  AC_MSG_RESULT([$build_ft2232_highspeed])
 
-  if test $want_ftd2xx_highspeed = yes -a $build_ftd2xx_highspeed = no; then
+  if test $want_ft2232_highspeed = yes -a $build_ft2232_highspeed = no; then
     AC_MSG_ERROR([You need a newer FTD2XX driver (version 0.4.16 or later).])
   fi
 fi
@@ -903,6 +903,28 @@ main( int argc, char **argv )
       AC_MSG_RESULT([Skipping as we are cross-compiling])
     ])
 
+  AC_MSG_CHECKING([whether to build libftdi highspeed device support])
+  AC_MSG_RESULT([$want_ft2232_highspeed])
+  if test $want_ft2232_highspeed != no; then
+    AC_MSG_CHECKING([for libftdi highspeed device support])
+    AC_COMPILE_IFELSE([
+#include <stdio.h>
+#include <ftdi.h>
+enum ftdi_chip_type x = TYPE_2232H;
+    ], [
+      AC_DEFINE(BUILD_FT2232_HIGHSPEED, [1],
+        [Support FT2232H/FT4232HS with FTD2XX or libftdi.])
+      build_ft2232_highspeed=yes
+    ], [
+      build_ft2232_highspeed=no
+    ])
+    AC_MSG_RESULT([$build_ft2232_highspeed])
+
+    if test $want_ft2232_highspeed = yes -a $build_ft2232_highspeed = no; then
+      AC_MSG_ERROR([You need a newer libftdi version (0.16 or later).])
+    fi
+  fi
+
   # Restore the 'unexpanded ldflags'
   LDFLAGS=$LDFLAGS_SAVE
   CFLAGS=$CFLAGS_SAVE