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    SubjectRe: DRAM and PCI devices at same physical address
    On 25 Jun 2004 17:23:00 -0400, Matt Sexton <sexton@mc.com> wrote:

    >
    > Should they be appearing there at all? Does Linux make any guarantees
    > when there is more physical memory than specified by "mem=" ?

    You've told linux there is only 512M of physical memory and it
    believes you, so it is using the available address space for memory
    mapped i/o. I know of no way to reserve memory on the command line.
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