On Tue, Jul 15, 2003 at 06:35:57PM +0100, Jamie Lokier wrote:
> There used to be a vesafb problem with MTRRs when the framebuffer had
> an odd size: 2.5MB of RAM (my laptop has this).
>
> It would create an MTRR for the first 0.5MB of the framebuffer, and
> then try to create another for the subsequent 2MB.
>
> The latter failed because it's not suitably aligned - i.e. there was a
> problem in th logic which splits non-power-of-two regions.
> Is that fixed these days?
Better would be to use change_page_attr to manipulate PAT bits.
We then wouldn't have to worry at all about alignment, running out
of MTRRs, or collisions with other MTRRs.
Dave
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