Upper limit for BSS on SPARC BSP ?

[Sebastian Huber]

On 05/09/18 15:45, Hugues Jérôme wrote:
> Hi Sebastian,
>
>> Le 5 sept. 2018 à 14:20, Sebastian Huber <sebastian.huber at embedded-brains.de> a écrit :
>>
>> Hello Hugues,
>>
>> On 05/09/18 14:02, Hugues Jérôme wrote:
>>> Hi,
>>>
>>> I’m investigating a memory alignement issue using the GR740 BSP.
>>> It appears we have a memory corruption when the BSS is bigger than 4MB.
>> does the ELF file look all right? Is the stack pointer at the end of RAM right at the entry point (start)? Is the BSS section properly zeroed in the startup sequence?
> I’m not sure I can provide any positive answer to these questions.
> We used the default GR740 BSP, compiled by Thanassis Tsiodras. We did not change anything
>
> As far as i can see, the BSS is zeroed by start.S
> do you have any recommendation to perform the diagnosis you prescribe ?

I would check this with the debugger.

>
> As far as I can provide details
> size (from binutils) can parse the ELF file, but that does not mean a lot
> stack pointer is set by the linker script (if I understood correctly this part), and we did not change it

The boot loader sets the stack pointer to the end of the usable RAM.

I would try to test this BSS size with a simple example program from the 
RTEMS testsuite using the RTEMS BSP build tree (configure the BSP build 
with --enable-tests=samples), e.g. modify the testsuites/samples/ticker 
program.

-- 
Sebastian Huber, embedded brains GmbH

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