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(grub.info)displaymem

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displaymem
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 - Command: displaymem
     Display what GRUB thinks the system address space map of the
     machine is, including all regions of physical RAM installed. GRUB's
     "upper/lower memory" display uses the standard BIOS interface for
     the available memory in the first megabyte, or "lower memory", and
     a synthesized number from various BIOS interfaces of the memory
     starting at 1MB and going up to the first chipset hole for "upper
     memory" (the standard PC "upper memory" interface is limited to
     reporting a maximum of 64MB).