how to increase memory limit reduced at boot-time by "mem"

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Hi all!

If the upper memory limit is reduced at booting by using the kernel command
line parameter "mem" is there a way how this memory limit could be increased
at some later point of kernel execution? In other words, if I exclude the
upper part of system memory from kernel's use at boot time, can I reclaim it
back at some later point? 

Particularly I am interested if this would work on the PowerPC and ARM
architecture, or is it not architecture depending?

Thanks a lot for your answer!

Ondrej
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