In the meantime I found out at the same site you sent me that there is a
directive for gdb not use breakpoints type thumb.
http://sourceware.org/gdb/onlinedocs/gdb/ARM.html
*set arm force-mode arm*
I'm going to test that tomorrow. If that works, it's all need.
On Tue, Oct 16, 2012 at 7:20 PM, Jorge Ventura <
[email protected]> wrote:
> Ok. I guess that the problem after MMU enabled is the same.
> While I wait for someone with a fix, I will read the link you sent me and
> try to figure out if I can do some kind of bubble gum.
> I'll keep you posted.
>
> Thank you.
>
>
> On Tue, Oct 16, 2012 at 6:36 PM, Andreas Fritiofson <
> [email protected]> wrote:
>
>> On Tue, Oct 16, 2012 at 11:11 PM, Jorge Ventura
>> <[email protected]> wrote:
>> > I did a single step at first instruction (0x80008000) but not the next
>> and
>> > you will see that it seems to be because size=3.
>> > I removed all arm thumb information from the kernel configuration for
>> not
>> > have mixed instructions.
>> >
>> > Make any sense for you gdb request read physical memory with size = 3
>> ???
>> > Maybe the problem is not openocd but gdb !!!
>>
>> GDB sends the packet 'Z0,80008008,3', where 3 is the breakpoint
>> "kind". Which is normally the length of the breakpoint. However, that
>> is architecture-defined and according to
>>
>> http://sourceware.org/gdb/onlinedocs/gdb/ARM-Breakpoint-Kinds.html#ARM-Breakpoint-Kinds
>> kind 3 is 32-bit Thumb-2 bp for ARM.
>>
>> I don't know if it makes sense or not for GDB to set a T2 bp in your
>> case but OpenOCD doesn't handle kind 3 so that's wrong anyway. We
>> erroneously refer to the parameter as "length" everywhere, and use it
>> as such in the Cortex-A target.
>>
>> We need to fix that in cortex_a8_set_breakpoint() and
>> cortex_a8_unset_breakpoint(). Patch welcome. I can probably come up
>> with a reasonable fix, but it would be even better if someone with
>> hardware to test it and better knowledge of armv7-a could do it.
>>
>> /Andreas
>>
>> > Debug: 1365 187001 gdb_server.c:2048 gdb_input_inner(): received packet:
>> > 'Z0,80008008,3'
>> > Debug: 1366 187001 gdb_server.c:1394
>> gdb_breakpoint_watchpoint_packet(): -
>> > Debug: 1367 187001 cortex_a.c:1986 cortex_a8_read_memory(): Reading
>> memory
>> > at address 0x80008008; size 3; count 1
>> > Debug: 1368 187001 cortex_a.c:1939 cortex_a8_read_phys_memory(): Reading
>> > memory at real address 0x80008008; size 3; count 1
>> > Error: 1369 187001 cortex_a.c:1408 cortex_a8_set_breakpoint(): Error @
>> > cortex_a8 read_memory:-601
>> > Error: 1370 187001 breakpoints.c:96 breakpoint_add_internal(): can't add
>> > breakpoint: unknown reason
>>
>
>
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