Linux-kernel mailing list archive 1999-37,: Re: MTRR setting and framebuffer driver

# Re: MTRR setting and framebuffer driver

Jamie Lokier (lkd@tantalophile.demon.co.uk)
Tue, 14 Sep 1999 22:49:54 +0200

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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.

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.

In some cases, that would allow an MTRR to be created where it is not
possible now.

-- Jamie

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