Re: [Dri-devel] IRQ problems

[Jeff H. <jha...@pr...>]

Adam K Kirchhoff wrote:
> 
> Since not all BIOS' support this option, are there plans to make the DRI
> work on computers where this is not possible?
> 
> Adam
> 
> On Mon, 22 May 2000, Jeff Hartmann wrote:
> 
> > You need to setup your BIOS to allocate an irq for your video card.
> > Usually the option is Allocate IRQ for VGA (yes/no).  Set this to yes.
> >
> > -Jeff
> >
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> >
> 
> --

Are there bios' that don't allocate irq's for vga?  Currently the mga
requires an irq to function w/ the DRI.  Changing this is not really an
option, however it is possible at a LARGE performance penality (and
polling in the kernel which is BAD).  The way the DRI driver manages
buffers is quite different from how the UtahGLX driver does its
management.  Doing it like Utah really only makes sense for one direct
client.  

If there are bios' that do not do this, (and for various other reasons)
there needs to be code in the kernel to do resource remapping.  I'm
pretty sure that this can not be done properly in the DRM.  Something
like this probably would require changing the core kernel.

-Jeff