[ECOS] Re: Different section placement for kernel and application

[Grant Edwards <grant.b.edwards@gmail.com>]

On 2011-01-28, Grant Edwards <grant.b.edwards@gmail.com> wrote:

>> With this modification the sections of the eCos components (from vectors.o, extras.o and libtarget.a)
>> are placed in the flash region when loaded with the RedBoot ROM monitor and GDB,
>> but a Bus error occurs in the reset_vector function:
>>
>> Loading section .rom_vectors, size 0x8 lma 0x8010000
>> Loading section .ecos.text, size 0x10bcc lma 0x8010008
>> Loading section .ecos.rodata, size 0x49dc lma 0x8020bd8
>> Loading section .ARM.exidx, size 0x10 lma 0x64008000
>> Loading section .text, size 0x924 lma 0x64008010
>> Loading section .rodata, size 0x108 lma 0x64008938
>> Loading section .data, size 0xdcc lma 0x68000000
>> Start address 0x8010009, load size 93624
>> Transfer rate: 9 KB/sec, 300 bytes/write.
>>
>> Program received signal SIGBUS, Bus error.
>> reset_vector () at [snip]/repo/ecos/packages/hal/cortexm/arch/current/src/vectors.S:100
>> 100                ldr     sp,=hal_startup_stack
>>
>> Is there a chance to get this working?
>
> I think so, yes.
>
> AFAIK, GDB stubs don't know how to program flash (and there's no
> indication it attempted to do so),

I posted too quickly.  It appears that gdb did try to load
.rom_vectors .ecos.text .ecos.rodata into flash.  After you do the
load (but before you "continue"), can you verify that the code
actually got loaded into flash?  I didn't think that the gdb stubs
knew how to write to flash.

-- 
Grant Edwards               grant.b.edwards        Yow! DIDI ... is that a
                                  at               MARTIAN name, or, are we
                              gmail.com            in ISRAEL?


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