[LinuxBIOS] BIOS-provided physical RAM map

How can I adjust the "BIOS-provided physical RAM map" that the linux  
kernel uses? Is this done in northbridge.c with ram_resource()???  
Because mine does not look the same.

ram_resource(dev, idx++, 0, 640);
ram_resource(dev, idx++, 1024, tolmk - 1024);

BIOS-provided physical RAM map:

BIOS-e820: 0000000000001000 - 00000000000a0000 (usable)

BIOS-e820: 0000000000100000 - 0000000008000000 (usable)

128MB LOWMEM available.

Thanks - Joe