- added info about libftdi support under win32

git-svn-id: svn://svn.berlios.de/openocd/trunk@638 b42882b7-edfa-0310-969c-e2dbd0fdcd60

contrib/libftdi/README

+libftdi can be built to work under win32 (cygwin/mingw) after applying the patch in this directory.
+
+The issue is caused by windows requiring usb_set_configuration to be called before the usb_claim_interface.
+
+Spen
+spen@spen-soft.co.uk
+

contrib/libftdi/libftdi-0.12_win32.patch

+--- src/ftdi.c.orig	Wed Apr 16 16:24:30 2008
++++ src/ftdi.c	Thu May 01 20:19:46 2008
+@@ -358,6 +358,17 @@
+     if (usb_detach_kernel_driver_np(ftdi->usb_dev, ftdi->interface) != 0 && errno != ENODATA)
+         detach_errno = errno;
+ #endif
++
++#if defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
++	if (usb_set_configuration(ftdi->usb_dev, 1) != 0) {
++		usb_close (ftdi->usb_dev);
++        if (detach_errno == EPERM) {
++            ftdi_error_return(-8, "inappropriate permissions on device!");
++        } else {
++            ftdi_error_return(-5, "unable to set configuration");
++        }
++	}
++#endif
+ 
+     if (usb_claim_interface(ftdi->usb_dev, ftdi->interface) != 0) {
+         usb_close (ftdi->usb_dev);

doc/openocd.texi

@@ -126,8 +126,8 @@ a FTDI FT2232 based interface:
 homepage (@uref{www.amontec.com}), as the JTAGkey uses a non-standard VID/PID. 
 @end itemize
 
-Please note that the ftdi2232 variant (using libftdi) isn't supported under Cygwin.
-You have to use the ftd2xx variant (using FTDI's D2XX) on Cygwin.
+libftdi is supported under windows. Versions earlier than 0.13 will require patching.
+see contrib/libftdi for more details.
 
 In general, the D2XX driver provides superior performance (several times as fast),
 but has the draw-back of being binary-only - though that isn't that bad, as it isn't