Re: CVS updates/VGA mode setting

[Petr V. <VAN...@vc...>]

On 30 Aug 00 at 8:04, James Simmons wrote:
> > ftp://platan.vc.cvut.cz/pub/linux/matrox-latest/2.4.0-test7-vgatext.gz.
> > It contains patch for 2.4.0-test7 which adds textmode and 8bpp modes
> > to vga16fb driver (8bpp of course only 320x200 cfb8 or 360x480 planar 8,
> > as standard VGA knows).
> 
> Nice. Support even for Mode X :-) I will take a look at it in depth. The

Yes. And it even works...

But 'cfb4' code (yes, even such thing is possible on VGA) works only
on some hardware... On other hardware you can have swapped even and
odd pixel columns (swapped nibbles in byte...). If memory serves correctly,
current version works on ATI chips, but does not on Matrox and C&T products.

> one thing I like to see is vgacon set the video mode itself instead of
> depending on the system firmware. The reason being is usually firmware is 

Problem is that for example Matrox devices are totaly dead after powerup.
And enabling framebuffer region and accessing it can cause PCI bus lockup,
because of memory clock (on old Millennium I) are programmed for 0Hz,
so PCI read cycle never finish.

                                        Petr