On Wed, 30 Jan 2002, Daryll Strauss wrote:
> On Wed, Jan 30, 2002 at 03:15:53PM -0500, Vladimir Dergachev wrote:
> > I completely agree with you.. but I did not give you details :))
> >
> > What happens is that if you try to use older drm driver with GATOS 2d
> > driver the GATOS driver will notice and complain. But if you use GATOS drm
> > driver with older 4.2.0 2d driver you will get a lockup.
> >
> > The reason is that the changes involve programming Radeon's memory
> > controller to place AGP aperture after the end of the framebuffer and not
> > at the start of PCI space as it is done currently. Both 2d driver and drm
> > driver have to agree on this - which is why a bump in major version is
> > necessary.
> >
> > The reason I did not do it is that the mesa driver checks major version as
> > well. Hence it will complain if it is bumped. Since I did not want to open
> > a new CVS module just for changing version in mesa driver I decided to go
> > the "slightly" broken way under assumption that few people with install
> > GATOS drm-kernel but will forget to install GATOS 2d driver.
> >
> > Does this make sense ?
>
> Sure does, but it sounds like we could change the Mesa drivers to have the
> same behavior as the GATOS drivers. If they see version x.y they use the
> old offset for AGP and if they see x.y+1 they use the new one. This
> would be much better than bumping the major version number.
>
> I may be glossing over details, in fact I probably am, but putting some
> effort into this is probably required if we want to be good Linux citizens.
That's a good idea.. Except that it wont' work. Mesa driver is distributed
with XFree86 anyway, so when GATOS patch gets merged in everything will
work ok. The problem is that I don't know how drm driver can check the
version of 2d driver that attempts to initialize it - if you know how
please let me know. Without this, first thing after we include mew drm
driver into Linux kernel we'll have people downloading it and getting a
lockup with 4.2.0 or earlier.
Vladimir Dergachev
>
> - |Daryll
>
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