Hi,
By default gdb uses software breakpoints and watchpoints and it doesn't work
on Cortex A8. You should use hardware bp/wp.
To do so execute next command in gdb:
monitor gdb_breakpoint_override hard
2010/10/6 Karl Kurbjun <kkurb...@gmail.com>
> Hi all,
>
> I am trying to use watchpoints with the A8, but they do not appear to be
> working. I have some simple test code that demonstrates this:
>
> -------------------------------------------------------------------------------
> void main()
> {
> while(1)
> {
> test_data++;
>
> delay_count = 50000;
> while(delay_count--) {};
> }
> }
>
> -------------------------------------------------------------------------------
>
> I tried to set a watchpoint on test_data (a global variable) with gdb:
>
> -------------------------------------------------------------------------------
> 0x00016f64 in ?? ()
> (gdb) load
> Loading section .boot_header, size 0x20 lma 0x40200000
> Loading section .vectors, size 0x20 lma 0x40200020
> Loading section .init, size 0xf0 lma 0x40200040
> Loading section .bob, size 0x374 lma 0x40200130
> Loading section .data, size 0x4 lma 0x402004a4
> Start address 0x40200020, load size 1192
> Transfer rate: 7 KB/sec, 238 bytes/write.
> (gdb) awatch test_data
> Hardware access (read/write) watchpoint 1: test_data
> (gdb) cont
> Continuing.
> ^C
>
> (gdb) info watchpoints
> Num Type Disp Enb Address What
> 1 acc watchpoint keep y test_data
>
> -------------------------------------------------------------------------------
>
> but the processor never stops.
>
> I double checked the objdump of the code:
>
> -------------------------------------------------------------------------------
> 402004a4 <test_data>:
> 402004a4: 00000002 andeq r0, r0, r2
>
> -------------------------------------------------------------------------------
>
> I then tried to set a watchpoint direct in OpenOCD and it appears to work:
>
> -------------------------------------------------------------------------------
> > wp 0x402004a4 4
> > resume
> target state: halted
> target halted in ARM state due to watchpoint, current mode: Supervisor
> cpsr: 0x600001d3 pc: 0x4020043c
> MMU: disabled, D-Cache: disabled, I-Cache: disabled
> Watchpoint triggered at PC 0x4020043c
>
> -------------------------------------------------------------------------------
>
> Is this a known issue with watchpoints within GDB or am I doing something
> wrong?
>
> -Karl
> _______________________________________________
> Openocd-development mailing list
> Openocd-development@lists.berlios.de
> https://lists.berlios.de/mailman/listinfo/openocd-development
>
_______________________________________________
Openocd-development mailing list
Openocd-development@lists.berlios.de
https://lists.berlios.de/mailman/listinfo/openocd-development
