[rpi bsp] configure fb section in mmu table and improvement for mailbox

[Sebastian Huber]

On 28/07/15 02:31, Pavel Pisa wrote:
>> >I think it's much closer to what we expected. you may checkout my github
>> >and my dropbox. 
>> >https://github.com/yangqiao/rtems/tree/framebuffer
>> >https://www.dropbox.com/sh/95bu6skofkmrlvc/AABXjwvvFhQScJdo_rwj12V6a?dl=0
>> >
>> >The commits log is messy, I'll rebase it afterward until we think it's
>> >acceptable.
> I think that Sebastian, Joel or some other core developer opinion
> would be nice there.

I don't have time to check out external repositories. I will only look 
at information included in e-mails posted to the devel list.

I am not sure why you need additional sections in the MMU table for the 
frame buffer. In case it needs non-cachable memory, why don't you put it 
into the .bsp_nocache section?  You can also use a heap for this 
section, see rtems_cache_coherent_allocate().

-- 
Sebastian Huber, embedded brains GmbH

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