lkml.org 
[lkml]   [2010]   [Jun]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Bug#584846: Detects only 64MB and fails to boot on Intel Green City board if e820 hooked by GRUB2
    On 06/12/2010 05:07 PM, Josh Triplett wrote:
    > 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

    Well *something* is... and it might not be Grub but one of the expansion
    ROMs. If so, the problem is probably Grub stepping on the expansion ROM
    by not honoring FBM.

    -hpa


    --
    H. Peter Anvin, Intel Open Source Technology Center
    I work for Intel. I don't speak on their behalf.



    \
     
     \ /
      Last update: 2010-06-13 02:19    [W:0.021 / U:31.052 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site