VRAM detection in controlfb.c

Michel Lanners mlan at cpu.lu
Fri Apr 28 16:09:20 EST 2000

Hi all,

On  28 Apr, this message from Daniel Jacobowitz echoed through cyberspace:
> On Thu, Apr 27, 2000 at 11:39:59PM -0400, Clint Hepner wrote:
>> I recently added another 2MB of VRAM to my PM8500
>> with control video, and was dismayed when linux wouldn't
>> recognize it.

Let me guess: you're running 2.2 kernel on an 8x00 machine....

>> My question is, is the problem only with detecting the
>> VRAM, or could there be problems addressing the VRAM as
>> well if the kernel isn't able to detect it on its own.
> No, there shouldn't be any problems.

The problem lies in the detection. 2.2 and 2.3 kernels have different
versions of the detection code; 2.2 will not work with 4MB on 8x00
machines, and 2.3 will not work with 4MB on 7x00 machines. So none of
the two versions is what we need :-(

> I may just support a boot parameter for this if I can't figure it
> out...

Considering that fewer and fewer people will use affected machines
(they're starting to get old...), adding a boot parameter may be the
right solution, except if by any magic we get at documentation from
Apple. I'm no magician, however ;-)


Michel Lanners                 |  " Read Philosophy.  Study Art.
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email   mlan at cpu.lu            |
http://www.cpu.lu/~mlan        |                     Learn Always. "

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