Mapping Video BIOS?

Greg 'groggy' Lehey grog at
Sat Jul 26 01:02:22 PDT 2003

I've spent the last couple of days tracking down a problem starting X
on a Dell Inspiron 5100.  I've got as far as discovering that the
video BIOS is not being completely mapped: it's 60 kB long, but only
48 kB are being mapped into memory.  To make matters worse, the
machine doesn't have a serial port, so I can't apply a kernel debugger
to find out what's going on.

Can anybody point me in the right direction?  Where should I be
looking for this?  Is this memory mapped permanently, or is it only
during X startup?

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