Re: Reserve memory from the command line

[Kasper Dupont <kasperd@daimi.au.dk>]

Steven Rostedt wrote:
> 
> Hi,
> 
> Today I just discoved that my Toshiba laptop has a small bit of bad
> memory.  So I went on looking for a way to reserve the memory area from
> the command line, because I run several kernels for various reasons and
> that it would be easiest to just modify lilo.conf.
> 
> After seaching the web and scanning the source code I realize that there
> are only patches to do this and not in the vanilla kernel.  I was
> wondering why such a usefull feature is not in the kernel?
> 
> I'm using kernel versions 2.4.7 to 2.4.18 and didn't want to go patching
> each one.  I'll probably just hardcode the bad memory as reserved and be
> done with it.
> 
> Is this feature planned on becoming part of the kernel, at least as a
> config option, and if not, then why not?
> 
> If it is already there, and I missed it, please let me know.

I couldn't find it in the Documentation directory, but there
is a comment about it in linux/arch/i386/kernel/setup.c

                /*
                 * "mem=nopentium" disables the 4MB page tables.
                 * "mem=XXX[kKmM]" defines a memory region from HIGH_MEM
                 * to <mem>, overriding the bios size.
                 * "mem=XXX[KkmM]@XXX[KkmM]" defines a memory region from
                 * <start> to <start>+<mem>, overriding the bios size.
                 */

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