The bug is perfectly reproducible on a system with such a BIOS (for
instance ASROCK 939A785GMH).
With RAID disabled the RAM is free up to about 0x9f800 (displaymem in
GRUB and lsmmap in GRUB2), with RAID enabled a reserved area appears at
0x92400 (len 0x0dc00).
The bug was mentioned long ago some
** Changed in: grub (Ubuntu)
Status: New => Triaged
** Changed in: grub (Ubuntu)
Importance: Undecided => High
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GRUB fails with certain memory configurations
https://bugs.launchpad.net/bugs/638945
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