Driver for ATI rs690t (xpress 1200m)

[Alex Deucher]

On 5/13/07, Warly <warly at warly.org> wrote:
>
> Hello, I want to detailed some trouble I have to investigate the non
> working rs690 support.
>
> The card is a IGP with a rs690 NB, AFAIK this is a x700 with the new NB
> from ATI.
>
> With the last 6.6.191 driver (with added pci ids), the driver only finds
> 64KB of RAM. Investigating, it seems the MC_FB_LOCATION or the NB_TOM
> registers are not working anymore.
>
> I use libsegfault to check what fglrx is doing, which brings me to find
> that this values seems now to be accessed through an indirect index/data
> query to 0x78/0x7C (likely the new value of R300_MC_IND_INDEX which is
> not working anymore).
>
> I figure out some other changes, dump a few values of the various
> potentially idx/data registers I found, but I couldn't get the LCD
> initialized correctly (the fglrx unfortunately seems to be using vesa
> mode on this chipset, but can I still use the trace to find out how the
> screen is setup?).
>
> I must admit it is my first look at a video driver, and I do not really
> know what I could do to progress, I figure out that my problem is likely
> a change in the RADEON_OV0_* registers, as everything else seems to
> initialized quite correctly.
>
> If you have any advice or some way I could investigate, I would be happy
> to check, please forgive me if I am missing some obvious steps. I can
> provide extra information if needed, I did not want to be long.
>

It could also be that the new XPRESS chips use the AVIVO display
engine, in which case, the current radeon driver will be of no use.

Alex