Actual Ram size: memmap command line

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Hi,
I have a generic x86 board, running Linux 2.6.23 which has 768 Mbytes of
RAM.
My understanding is, I can pass the system memory size through kernel
command line:
through "memmap":

"memmap=640K@0 memmap=255M@1M"

The above kernel command line indicates to the kernel there are 255
Mbytes of available memory.

My questions is, when I change the "255" to a larger number e.g "768",
when I type "free" command
Or cat /proc/meminfo, the system still reports  255Mbytes of RAM.

Why? How do I fix it?

Many thanks in advance,
Bizhan

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