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13.3.37 uppermem

— 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.