* [ECOS] eCos PowerPC Startup
@ 2000-06-28 11:02 amassa
2000-06-28 23:18 ` [ECOS] " Jesper Skov
0 siblings, 1 reply; 2+ messages in thread
From: amassa @ 2000-06-28 11:02 UTC (permalink / raw)
To: jlarmour, jskov; +Cc: ecos-discuss
Since I have been having so much trouble getting ecos running on my MBX
board I have stepped as far back to the beginning as possible. I have been
stepping through the startup code (in vectors.s) on my MBX board because it
seems to be hanging each time. I am using the EPPC-bug firmware to step
through each assembly line.
When I compile the code I see that the srec file is generated with an offset
of 0x10000 (if no exception vectors are copied) or 0x10100 (when exception
vectors are present).
I had to manually define CYGSEM_HAL_POWERPC_COPY_VECTORS in vectors.s
because it would not copy the vectors when I have it configured that way in
my ecos configuration.
I checked and found the correct assembly code present at the specified
address.
I ran the code in two different situations, the first was without any
exception vectors copied. I stepped through the code and the board hung as
soon as I tried to branch from vectors.s in the _start routine to mbx.s in
the hal_hardware_init routine.
The next time I ran I didn't get very far at all. The IP was at 0x10100
which is the reset vector. I step through the vector which basically just
jumps to _start at address 0x12000. As soon as I tried to step to the
branch instructions (bclr), the board hangs.
Any insight into what might be going on would be greatly appreciated.
Thanks,
Anthony
^ permalink raw reply [flat|nested] 2+ messages in thread
* [ECOS] Re: eCos PowerPC Startup
2000-06-28 11:02 [ECOS] eCos PowerPC Startup amassa
@ 2000-06-28 23:18 ` Jesper Skov
0 siblings, 0 replies; 2+ messages in thread
From: Jesper Skov @ 2000-06-28 23:18 UTC (permalink / raw)
To: amassa; +Cc: jlarmour, jskov, ecos-discuss
>>>>> "amassa@cts" == amassa@cts com <amassa@cts.com> writes:
amassa@cts> I had to manually define CYGSEM_HAL_POWERPC_COPY_VECTORS
amassa@cts> in vectors.s because it would not copy the vectors when I
amassa@cts> have it configured that way in my ecos configuration.
Then you probably _didn't_ change CYGSEM_HAL_USE_ROM_MONITOR - when
that is set, eCos relies on the ROM monitor to provide such things as
exception vectors.
Jesper
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2000-06-28 11:02 [ECOS] eCos PowerPC Startup amassa
2000-06-28 23:18 ` [ECOS] " Jesper Skov
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