Alex Deucher wrote:
On 12/24/05, Dave Jones <[EMAIL PROTECTED]> wrote:
On Fri, Dec 23, 2005 at 11:20:34PM +0000, Dave Airlie wrote:
>
> > Anyhow, I was wanting to volunteer my services and my Radeon Xpress 200M
for development work on this project. I have some kernel hacking/driver development
experience, but that was on a device with open specifications, so I wanted to ask the
following questions:
> > 1) What do we currently know about these chipsets?
>
> They have no on-board RAM and are PCI Express
I'm not entirely sure that's correct. Santa brought me a laptop
which gives me the option of using the onboard video ram, system ram,
or even both. I've not had chance to play with it much yet though.
Some of the new XPRESS chips have mixed on-board/system
configurations. There are supposedly desktop versions with mixed ram
types as well.
on the xpress chips, it's called sideport. It can apparently do
local/system ram accesses interleaved, though I've no idea how it works
(maybe per-tile access, half the tiles local half not?). The other
possible modes (i.e. uma only, sideport mem only, or sideport + uma but
not interleaved) look simpler.
On the desktop chips (at least for the "old" 3-letter Xxyz chips) it's
called hypermemory. As far as I can tell though those chips can't do
interleaved accesses, and I don't think there's anything different to
the non-hypermemory cards whatsoever (except they have less ram on a
half-as wide bus). At least all r300 based chips should be able to
render to system memory directly already.
Roland
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