Debugging broken BSP suggestions?

[Joel Sherrill]

On 3/6/2014 11:19 AM, Gedare Bloom wrote:
> On Thu, Mar 6, 2014 at 5:37 AM, James Fitzsimons
> <james.fitzsimons at gmail.com> wrote:
>> Hi all,
>>
>> I'm trying to get an old bsp working - the mrm332 bsp for a 68332 target. I
>> know it's old technology but I have one of these boards and it will be a
>> good fit for a project I want to do.
>>
>> Unfortunately I don't think the mrm332 bsp can every have been in a working
>> state, or at least it isn't anymore.
>>
> What version of RTEMS is this BSP on?
>
>> I managed to get it kind of working by using the RAM linker script which
>> just dumps everything into RAM, of course you can only run your program once
>> and then you have to reload because the .data section gets hosed.
>>
>> I think I'm close to a linker script to run out of ROM, but it seems to be
>> failing when it gets to bsp_get_work_area in bootcard.c. All I end up with
>> is garbage at the console. I've verified it works up to here by switching on
>> one of the onboard LED's just prior to the call to bsp_get_work_area. I've
>> also examined the memory (flash and RAM) and it all looks pretty good.
>> Moving the LED code to just after the call to bsp_get_work_area doesn't
>> work.
>>
> The most likely case is that the work area is overlapping with other
> memory sections in your linker script. The work area and program heap
> need to be well-defined regions that do not overlap with anything
> else, otherwise the initialization of those heaps will wipe out
> whatever memory they overlap.
>
>> I've gone over my linker script a dozen times. Anyone have any suggestions
>> as to how to debug this problem?
>>
> Try to find the bounds on the program heap and the work space. See
> what the start/end addresses are and whether they are overlapping with
> anything else in memory.
If on the head, this is a likely candidate. AFAIK this BSP has not been
tested since
we moved to the common code for initializing memory. A simple bug in memory
layout during the adjustment would do this.
> Good luck,
> Gedare
>
>> Many thanks!
>> James Fitzsimons
>>
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>>
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-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
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