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    SubjectRe: [STATUS 2.5] October 30, 2002
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    On Fri, 2002-11-01 at 14:05, Eric W. Biederman wrote:
    > When you have a correctable ECC error on a page you need to rewrite the
    > memory to remove the error. This prevents the correctable error from becoming
    > an uncorrectable error if another bit goes bad. Also if you have a
    > working software memory scrub routine you can be certain multiple
    > errors from the same address are actually distinct. As opposed to
    > multiple reports of the same error.

    Note that this area has some extremely "interesting" properties. For one
    you have to be very careful what operation you use to scrub and its
    platform specific. On x86 for example you want to do something like lock
    addl $0, mem. A simple read/write isnt safe because if the memory area
    is a DMA target your read then write just corrupted data and made the
    problem worse not better!

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