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    From
    SubjectRe: x86 36-bit support easier with Xeon?
    Date
    Followup to:  <199807062200.AAA00813@stefan.sime.com>
    By author: Stefan Traby <stefan@sime.com>
    In newsgroup: linux.dev.kernel
    >
    > Hi !
    >
    > > 'How do we DMA into >4G physical RAM?'
    > >
    > > 2) PCI cards which support 64 bit addresses might work (ie. none of most
    > > current PCI cards, and i guess chipsets arent too overtested either,
    > > regarding this feature).
    >
    > Hmm, the current "64 bit" PCI-Slots (ex. on Alphas) allow 64 Bit data but
    > only 32 bit addresses. This is no real problem for current boards
    > (UX && BX: 6x512M == 3GB max mem); but I'm not shure if the PCI specs
    > covers 64 bit addresses at all; I don't think so.
    >

    They do, but it's an extension, and most cards don't support them it
    seems.

    -hpa
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