[Openocd-development] 'flash write_image' and 'verify_image' commands fail if there are no more har

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Hi all,

I found that after manually setting hardware breakpoints 'flash write_image' 
and 'verify_image' commands fail if there are no more hardware breakpoints 
available.

I think they should be removed before command execution and then restored.

---------------------------------------------------------
(STR9comStick, ARM966E, FT2232, openocd svn 881)
---------------------------------------------------------
> bp 0x40 4 hw
> bp 0x100 4 hw
> verify_image prog.elf
no watchpoint unit available for hardware breakpoint
can't add hardware breakpoint, resource not available
can't add breakpoint to finish algorithm execution
error executing arm7_9 crc algorithm
Runtime error, file "?", line 1:
    no watchpoint unit available for hardware breakpoint
can't add hardware breakpoint, resource not available
can't add breakpoint to finish algorithm execution
error executing arm7_9 crc algorithm

In procedure 'verify_image' called at file "?", line 1
>
> rbp 0x40
> rbp 0x100
> verify_image prog.elf
verified 5588 bytes in 0.109375s
>
---------------------------------------------------------

Another question, about 'working_area'.

By default scripts (at least str9comstick.cfg) point at the beginning of 
SRAM.
For this reason it is not very clear what 'working_area' is (unless you read 
the documentation...) and one can believe (me, for example...) it is the 
beginning of internal SRAM.
If you load an application into the RAM at the same address (normally at the 
beginning of SRAM) using 'load-image' there is no check of this conflict and 
the load_image algorithm will overwrite itself while running.

Similar problem can happen if you are stepping an application (loaded in 
flash) and you want to load an image (data for debugging purpose) into the 
RAM at a known free address and then resume the application.
The beginning of the RAM will be overwritten by the algorithm code so some 
variable of your running application is now dirty (registers too?).
In this case you can use the 'backup' option of 'working_area' command but 
it is not in the default script (should it be?) nor a warning is given to 
the user.

The problem is evident only with 'dcc_downloads' enabled.

-----------------------------------------------------------------------------------
(STR9comStick, ARM966E, FT2232, openocd svn 881)
using default scripts (nobackup)
-----------------------------------------------------------------------------------
> mdw 0x50000000 64
0x50000000: e1a02000 e3e00000 e1a03001 e3a04000 ea00000b e7d21004 e59f7030 
e0200c01
0x50000020: e3a05000 e3500000 e1a06080 e2855001 e1a00006 b0260007 e3550008 
1afffff8
0x50000040: e2844001 e1540003 1afffff1 eafffffe 04c11db7 00000000 00000000 
00000000
0x50000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000080: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000a0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000c0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
> mww 0x50000000 0 64
> mdw 0x50000000 64
0x50000000: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000020: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000080: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000a0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000c0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
> dump_image zero.img 0x50000000 256
dumped 256 byte in 0.015625s
> load_image zero.img 0x50000000 bin
256 byte written at address 0x50000000
downloaded 256 byte in 0.015625s
> mdw 0x50000000 64
0x50000000: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000020: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000   [OK]
0x50000080: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000a0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000c0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
> arm7_9 dcc_downloads enable
dcc downloads are enabled
> load_image zero.img 0x50000000 bin
256 byte written at address 0x50000000
downloaded 256 byte in 0.015625s
> mdw 0x50000000 64
0x50000000: 00000000 e3110001 0afffffc ee111e10 e4801004 eafffff9 00000000 
00000000
0x50000020: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000   [NOT OK]
0x50000080: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000a0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000c0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
> mww 0x50000000 0x11111111 64
> mdw 0x50000000 64
0x50000000: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x50000020: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x50000040: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x50000060: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x50000080: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x500000a0: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x500000c0: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x500000e0: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
> load_image zero.img 0x50000000 bin
256 byte written at address 0x50000000
downloaded 256 byte in 0.015625s
> mdw 0x50000000 64
0x50000000: 50000410 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x50000020: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x50000040: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x50000060: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111   [NOT OK]
0x50000080: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x500000a0: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x500000c0: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
0x500000e0: 11111111 11111111 11111111 11111111 11111111 11111111 11111111 
11111111
> arm7_9 dcc_downloads disable
dcc downloads are disabled
> load_image zero.img 0x50000000 bin
256 byte written at address 0x50000000
downloaded 256 byte in 0.015625s
> mdw 0x50000000 64
0x50000000: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000020: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000040: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x50000060: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000   [OK]
0x50000080: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000a0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000c0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
0x500000e0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
00000000
>
-----------------------------------------------------------------------------------

Best regards,

              Dario 

[Openocd-development] 'flash write_image' and 'verify_image' commands fail if there are no more har

The Open On-Chip Debugger

[Openocd-development] 'flash write_image' and 'verify_image' commands fail if there are no more hardware breakpoints available