Hi Vitaly, and Grant.
What more is needed except breakpoints and uC description files to get
JTAG (CPU control, RAM reading, FLASH writing) working, like described
here: http://www.ti.com/litv/pdf/slaa149c ?
slaa149c does not provide anything about JTAG functionality necessary
for debugging, namely breakpoints and cpu registers access.
It only describes memory access and flash/fuse programming.
From what I can see, the only thing missing is the setting of break
points, and reading of registers. Reading/writing of memory is there,
programming flash, setting the PC, and Run/Halt is there.
So what about starting the programming effort to implement gdbproxy (the
commands received from gdb are quite simple) whith the information in
slaa149c as a starting point. Then once the run/halt/memory read/write
and flash read/write are implemented we can set about figuring out how
TI set breakpoints and read registers from a part attached to the JTAG port.
There are a few examples of gdbproxy implementations around maybe a good
place to start would be
http://avarice.sourceforge.net/
This would get the gdb end of things working, cut in the JTAG stuff from
slaa149c get that working and the work to decode the register operations
and breakpoints should not be that difficult.
In the long term I think it would be best to avoid the NDA/binary
library because your then locked in. Put the effort into an open
solution if TI are not going to come to the (open source) party.
There are quite a few examples where the register read/breakpoints are
implemented (although probably covered by no reverse engineering licence
agreements) IAR/Code studio etc.
Ideas?
Regards
--
Peter Jansen
STS
Antarctic Division
203 Channel Highway
Kingston
TAS 7050
AUSTRALIA
Phone +61 3 6232 3533
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