[LinuxBIOS] any chance to get X fbdev driver to work ?

Christian Sühs chris at suehsi.de
Sat Dec 24 11:02:49 CET 2005

Hey, and Happy X-Mas for all

For non working Bootsplash with vesafb and LinuxBios I use the Viafb 
from Epia2 patch Kernel 2.4.25. Now Bootsplash works, with a little 
trick in the bootsplash sources :D

But I'm not able to bring up a XServer with fbdev as driver. The system 
hangs without any errors. It seems the problem is the viafb inside the 
Kernel. Unfortunatly, I have the same problem with orginal Bios.
Furthermore, the X via driver does not work with the LinuxBios system.
I get an VGA_Bios checksum failure. With original Bios it works.

I have had a look on the X Via driver sources. The file called 
via_bios.c (search for checksum)
It seems the routine looks on 0xc0000 for a valid vga_bios, all other 
checks before are verified as true. Only the last check fails.

I have tried to start X without Bios Callbacks, but fail.

Is there any solution.

It should be a valid bios on 0xc0000, the checksum routine is a loop 
about 65536 bytes. the result must be zero.

As I create the vga bios, I have fill up the rest with OO to 65536. Is 
that the problem? Should I fill up with FF?


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