Mapping Video BIOS?

Greg 'groggy' Lehey grog at
Sun Jul 27 20:26:57 PDT 2003

On Saturday, 26 July 2003 at 22:18:59 -0600, M. Warner Losh wrote:
> In message: <20030727015903.GJ45069 at>
>             "Greg 'groggy' Lehey" <grog at> writes:
>> Presuming that it's the ROM driver, I get this in the dmesg I posted:
>> pnpbios: Bad PnP BIOS data checksum
> That's likely the problem.  However, PnP BIOS information isn't the
> same thing that the orm[sic] driver probes for.

They look related.  I've now found the orm output:

  orm0: <Option ROMs> at iomem 0xe0000-0xe3fff,0xdf800-0xdffff,0xd0000-0xd17ff,0xc0000-0xcefff on isa0

The last one is the video BIOS.  It's interesting to note that it
doesn't report the 4 kB BIOS at 0xcf000, which suggests that at this
point the 16 kB area is already unmapped.  

I've worked around the problem by compiling the video BIOS into the X
server and not trying to access the BIOS in the machine.  Obviously
not a solution, but it works for the moment.  I'd really like to track
down the problem.  Does anybody have an idea?

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