Radeon Xpress 200G Memory size
alexdeucher at gmail.com
Fri Jan 20 09:19:51 PST 2006
On 1/20/06, Erwin Rol <mailinglists at erwinrol.com> wrote:
> On Fri, 2006-01-20 at 12:09 -0500, Alex Deucher wrote:
> > On 1/20/06, Erwin Rol <mailinglists at erwinrol.com> wrote:
> > > Hey all,
> > >
> > > I have a question, what are the relations between the different ways of
> > > checking how much memory is used for the integrated graphics chip in the
> > > Radeon Xpress 200 ? I tired lspci (the size of the largest PCI region,
> > > xorg.logs (the size int10 reports as is found in the Xorg.log file),
> > > grub (the memory grub reports at the boot screen) and windows XP64 (the
> > > size the XP device manager reports) to check how much memory is used.
> > > When i select 16M, 32M, 64M or 128M in the BIOS for the UMA size i get
> > > the following values.
> > >
> > > BIOS lspci xorg xp64 grub
> > > 16M 64M 3072k 16M 632k/2078656k
> > > 32M 64M 7168k 128M 632k/2062272k
> > > 64M 128M 15360k 128M 632k/2029504k
> > > 128M 256M 31744k 256M 632k/1963968k
> > >
> > > These values just look weird to me, is there a explanation on why they
> > > look like that ?
> > Xpress chips need to be treated like IGP chips (the info->isIGP flag
> > must be set in the driver) so ram detect is currently wrong in the
> > xorg driver (this should be fixed by daniels latest commit in xorg
> > cvs).
> That would than explain the memory size xorg finds, but the lspci output
> still looks weird, why does it need a region that is bigger than what is
> setup in the BIOS, and why is it so "random". Shouldn't the BIOS setup
> the PCI ranges, if so , why are they different on lspci and XP ? This
> all just looks really weird to me.
the sizes in lspci are the sizes of the aperture, not the amount of
vram. They do not always correspond, even for cards with discrete
> - Erwin
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