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    SubjectRe: Bug#584846: Detects only 64MB and fails to boot on Intel Green City board if e820 hooked by GRUB2
    On Sat, Jun 12, 2010 at 04:02:44PM -0700, H. Peter Anvin wrote:
    > On 06/12/2010 03:26 PM, Josh Triplett wrote:
    > >
    > > Everything looks identical except for the region GRUB hooked right below
    > > the first reserved region; the unhooked version has available memory
    > > from 0-0x9cbf0, and the hooked version has available memory from
    > > 0-0x9cba0, then reserved from 0x9cba0-0x9cbec, then 4 bytes of available
    > > memory, and then the same reserved region as before.
    >
    > Actually... are both these done by chainloading Grub (with and without
    > mapping), or is the unhooked done without chainloading Grub at all?
    >
    > To me it looks like something is chaining INT 15h even in the
    > "unchained" case...

    The "unhooked" case still chainloaded from GRUB, just without calling
    drivemap and thus without hooking anything. I can test without
    chainloading from GRUB, though to the best of my knowledge GRUB doesn't
    hook int 15 unless it needs to intercept e820 (and e801 and 88).

    - Josh Triplett


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