Re: MTRR setting and framebuffer driver

Jeff Garzik (jgarzik@pobox.com)
Tue, 14 Sep 1999 17:45:52 -0400

Jamie Lokier wrote:
>
> Richard Gooch wrote:
> > I agree. I don't like the idea of adding kludges to the MTRR code. It
> > should provide a minimal interface, making no assumptions about PCI
> > regions or anything like that.
>
> > [...] since we are assuming PCI region rules.
>
> I don't think it has anything to do with PCI.

vesafb is ISA/PCI-only, at least.

> If we can assume that unregistered physical address space is never
> accessed (whatever the bus), it's safe to have MTRRs covering that space
> redundantly.

I don't think that assumption can be made until all the drivers use the
new resource code.

Jeff

-- 
Custom driver development	|    Never worry about theory as long
Open source programming		|    as the machinery does what it's
				|    supposed to do.  -- R. A. Heinlein


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