Hi,
some days ago I added a jtag connector to a ADuC7022 board and used an
olimex USB adapter with OpenOCD (compiled from SVN head) to test whether
that works.
Well, I stumbled into some strange problems, and after some hours of
debugging OpenOCD it looks like the ADuC7022's watchdog is the culprit.
After issuing a 'halt' via OpenOCD's telnet terminal, the watchdog timer
is not frozen, and when the watchdog finally tries to reset the
ADuC7022, the JTAG state is somewhat corrupted.
Of course I could rewrite the firmware to keep it from enabling the
watchdog in the first place. But the most elegant fix for that would be
to make OpenOCD periodically issue a 'mww 0xffff036c 0' to reset the
watchdog. But I didn't find any way to configure that. If OpenOCD had
a full TCL interpreter, the following code would work:
proc watchdog_service {} {
mww 0xffff036c 0
after 200 watchdog_service
}
target_script 0 post_halt watchdog_service
target_script 0 pre_resume { after cancel watchdog_service }
So, does anybody know how to achieve that without patching the sources?
If patching the sources were required, maybe adding another kind of
target script ("while_halted") might be a solution and I'd be happy to
write a patch if nobody objects.
cheers,
David
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