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(grub.info)uppermem

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uppermem
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 - Command: uppermem kbytes
     Force GRUB to assume that only KBYTES kilobytes of upper memory
     are installed. Any system address range maps are discarded.

     *Caution:* This should be used with great caution, and should only
     be necessary on some old machines. GRUB's BIOS probe can pick up
     all RAM on all new machines the author has ever heard of. It can
     also be used for debugging purposes to lie to an OS.