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Re: eCos GNU tools 4.6.2-20120125 ready for testing
On 04/03/12 19:37, John Dallaway wrote:
> However, this success was achieved using arm-eabi-gdb 6.8.50.20080706.
> There does appear to be an issue with the length of the 'g' packet when
> using the new arm-eabi-gdb 7.3.1:
>
>> (gdb) tar rem /dev/ttyS0
>> Remote debugging using /dev/ttyS0
>> Remote 'g' packet reply is too long: e14e000810000000000000001000000000000000000000000000000000000000000000000000000000000000fccf0d6800000000e8cf0d6895680008e24e00080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000021
>> (gdb)
>
> We will need to look into why the packet length has apparently changed
> for Cortex-M targets. I can connect to an ARM7 target using the new GDB
> without problem.
This is a mismatch between the number of registers a gdb server reports
and the number that gdb expects for the given architecture. In this case
too many registers are being reported. IIRC, there should be 8 hex
digits for a register, so the above string seems to represent 42
registers instead of the 21 that Cortex-M has. Looks like a bug in the
monitor stub code, or perhaps a work around for something broken in
older toolchains?
Tomas