[Openocd-development] Correct PXA270 behaviour only, when TRST and SRST are NOT under control?

[Carsten S. <c.s...@ko...>]

Hi Dominik,

After spending some time with OOCD and the PXA270 today, I found that
the DCSR is read as expected and upload starts as long as I neither
touch nor control either TRST nor SRST.

Don't ask me why. But in this case I get the expected return value from
the DCSR. Then upload to miniIC starts. Later the software reports:

$ ./openocd.exe  -f ../../openocd.cfg
Info:    openocd.c:83 main(): Open On-Chip Debugger (XScale branch,
2006-11-22 14:00 CEST)
Warning: jtag.c:1074 jtag_read_buffer(): value captured during scan
didn't pass the requested check: captured: 0x00 check_value: 0x02
check_mask: 0x06
Error:   xscale.c:392 xscale_receive(): JTAG error while receiving data
from debug handler

This is absolutely reproduceable. I also checked inverted polarities for
TRST and SRST, but in this case the JTAG either stays in RESET state (so
TRST was configured the wrong way, always asserted). For SRST the same.
Any of the four possible permutations of polarity inversions causes the
DCSR to be read as all zero.

Removing the control for both signals from the parport.c file results in
DCSR to be always readable, and it reports the desired bits at least.  

It now hangs after the upload of the debug handler, while waiting for
some data from the debug handler. I captured a debug log - please tell
me if you need it. I will send it to your private email address.

I expect

Regards
Carsten Schlote


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