how to use memmap= option

[Long Wind]

I have asked Debian users, they don't seem to know
kernel 2.4/2.6 fail to boot on my PC
probably because it can't detect my memory
so I have to tell kernel memory map

the following is copied from kernel-parameters.txt:

memmap=exactmap	[KNL,X86] Enable setting of an exact
			E820 memory map, as specified by the user.
			Such memmap=exactmap lines can be constructed based on
			BIOS output or other requirements. See the memmap=nn@ss
			option description.



Could you tell me how to construct memmap= lines?
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