Bug#493521: xserver-xorg: can only use half of my video RAM
On Tue, Sep 16, 2008 at 9:56 PM, Brice Goglin <Brice.Goglin@ens-lyon.org> wrote:
> Zack Weinberg wrote:
>> (II) RADEON(0): Generation 2 PCI interface, using max accessible memory
>> (II) RADEON(0): Detected total video RAM=524288K, accessible=262144K
>> (PCI BAR=262144K)
>> (--) RADEON(0): Mapped VideoRAM: 262144 kByte (256 bit DDR SDRAM)
>>
>
> I am reading this as:
> * the driver rea somewhere in the registers that the board has 512MB
> * the PCI config space only makes 256 available through I/O MEM
>
> It could mean that the board keeps 256MB available for its own use
> (internal memory management, or DMA from/to the host) but the host
> cannot write/read directly in there.
Yeah, that's how I read it too. It might be harmless; I'm really only
concerned with it because I wonder if it's a cause of some of the
other problems (like maybe the screen flicker issues would go away if
the X server wasn't having to do something unusually slow with the
frame buffer -- I guess a 3520x1200x32 fb is only 128MB or so, but
still)
The "Cannot get VRAM scratch space" part is more of a worry, honestly;
that seems like it might mess up things the firmware is doing.
zw
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