grub2-dev: BIOS port memory map

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1 8 BIOS port memory map
1 **********************
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1 Start       End                Usage
1 --------------------------------------------------------------------
1 0           0x1000 - 1         BIOS and real mode interrupts
1 0x07BE      0x07FF             Partition table passed to another
1                                boot loader
1 ?           0x2000 - 1         Real mode stack
1 0x7C00      0x7D00 - 1         Boot sector
1 0x8000      ?                  GRUB kernel
1 0x68000     0x71000 - 1        Disk buffer
1 ?           0x80000 - 1        Protected mode stack
1 ?           0xA0000 - 1        Extended BIOS Data Area
1 0xA0000     0xC0000 - 1        Video RAM
1 0xC0000     0x100000 - 1       BIOS
1 0x100000    ?                  Heap and module code
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