[U-Boot] [PATCH 2/3] video: add support for display controller in MB86R0x SoCs

[Matthias Weißer]

Am 22.04.2010 14:41, schrieb Wolfgang Denk:
> Dear Matthias Weisser,
>
> In message<1271932257-14618-3-git-send-email-weisserm at arcor.de>  you wrote:
>> This patch adds support for the display controller in
>> the MB86R0x SoCs.
>>
>> Signed-off-by: Matthias Weisser<weisserm at arcor.de>
> ...
>> +	pGD->memSize = VIDEO_MEM_SIZE;
>> +	pGD->frameAdrs = PHYS_SDRAM + PHYS_SDRAM_SIZE - VIDEO_MEM_SIZE;
>
> Please pay attention to the global memory map requirements. PRAM might
> go first.

Can you please explain this a bit more in detail? I checked the source 
and README for CONFIG_PRAM and it seems to be reserving some space at 
the end of RAM. But I have only found reference to it in ppc and m68k code.

What would be the correct way to reserve some 2MB-4MB at the end of 
system RAM as a framebuffer for the integrated graphics device?

Thanks in advance

Matthias