Hello linux-embedders,
Currently, I'm working on a 486 PC equipped with 4MB RAM.
Memory space is a really vital part on my system.
a few times ago, I was working on the startup part of Linux
kernel.
I noticed that when pagination is activated, a temporary page table
allocating 4MB
of RAM is used. The 1st MB seems to be used to let BIOS run freely and
to reserve a bootloader-kernel data communication area (at 0x90000) and
kernel
code begins over this 1st MB.
My question is maybe quite simple for you, but I didn't find any answer in
the kernel code : are we sure that when kernel is running after init phase,
this part
of memory is entirely freeed by kernel for future memory use (such as module
insertion
or tasks usage). Thanks in advance,
Hiroaki.
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