[PATCH] testsuite/spcache01: Clear allocated coherent cache memory

[Sebastian Huber]

On 18/10/2021 23:08, Chris Johns wrote:
> On 18/10/21 8:37 pm, Sebastian Huber wrote:
>> On 18/10/2021 09:53, Chris Johns wrote:
>>> On 18/10/21 4:50 pm, Sebastian Huber wrote:
>>>> On 18/10/2021 07:19,chrisj at rtems.org   wrote:
>>>>> From: Chris Johns<chrisj at rtems.org>
>>>>>
>>>>> - Coherent cache memory is used in libbsd for things like descriptors
>>>>>      and it optionally clears the memory on allocation. Test is works.
>>>> There is no guarantee that memset() and memcpy() work with cache coherent
>>>> memory. Such memory areas may disallow misaligned access for example.
>>> That seems reasonable however this change about testing the implicit
>>> requirements we have that memset works. LibBSD requires memset works ...
>>>
>>> https://git.rtems.org/rtems-libbsd/tree/rtemsbsd/rtems/rtems-kernel-bus-dma.c?h=6-freebsd-12#n260
>>>
>> Using memset() here could be a bug in libbsd.
> Yes, I also think so.
> 
> But what is a suitable mechanism to make sure the arch or BSP handle it
> correctly? Maybe a clear routine in libbsd using the bus space API? That
> interface has to work or the drivers will not work.

I think we had similar issues on another BSP. Christian, do you remember 
how we solved this?

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