linux - Reserving system memory using kernel boot parameters -


i playing of linux boot params. trying create hole in system memory using memmap option. have 6gb system , e820 map shows: 0x100000-0xcf49d000 usable memory. decided create hole 128mb 1g , mark reserved , allow system use memory 1g-2g.

in boot options configured follows: memmap=890m$128m memmap=1g@1g.

however, once system boots modified memory map quite different expect.

0000000000100000 - 0000000037a00000 (usable)
0000000040000000 - 0000000080000000 (usable)

what must doing wrong?

i know, kernel needs low memory , cant make whole 1m 1g. why thought of giving 128mb initial boot sequence.

thanks


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