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    SubjectRe: K6-2 MTRR Problem
    Richard Gooch wrote:
    >
    > H. Peter Anvin writes:
    > > Followup to: <199906160823.SAA04602@vindaloo.atnf.CSIRO.AU>
    > > By author: Richard Gooch <rgooch@atnf.csiro.au>
    > > In newsgroup: linux.dev.kernel
    > > >
    > > > Michael McLinn writes:
    > > > >
    > > > > It seems something isn't right with MTRR support for the K6-2,
    > > > >
    > > > > I have a K6-2 450, running 2.2.10.
    > > > >
    > > > > When I boot, there is a /proc/mtrr, but it is empty.
    > > > >
    > > > > When I
    > > > > echo "base=0xe8000000 size=0x10000000 type=write-combining" >| /proc/mtrr
    > > > ^^^^^^^^^^
    > > >
    > > > So you have 256 MiB of RAM on you graphics card? Where can I buy one?
    > >
    > > The standard AGP aperture is 256 MiB; doesn't mean that the card
    > > actually has that much.
    >
    > Ah. How gross.
    >
    > > However, please note that the base address (0xe8000000) and the size
    > > (0x10000000) are incompatible!
    >
    > Indeed! So the AGP spec doesn't say anything about base address
    > increments? It would seem prudent for them to revise that part of the
    > PCI spec too...
    >

    AGP uses PCI base registers to assign the base of its window.
    Accordingly, the data Michael McLinn put in are simply bogus: (base &
    (size-1)) must be 0.

    -hpa

    --
    "The user's computer downloads the ActiveX code and simulates a 'Blue
    Screen' crash, a generally benign event most users are familiar with
    and that would not necessarily arouse suspicions."
    -- Security exploit description on http://www.zks.net/p3/how.asp

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