How do I use memmap to reserve memory on boot?

Posted by alexl on Super User See other posts from Super User or by alexl
Published on 2011-02-09T07:30:32Z Indexed on 2012/03/24 5:33 UTC
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linux

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boot

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memory

Ive got a laptop with some corrupted ram addresses, so I'm trying to use memmap to reserve them before linux boots up. Ive been trying to use memmap=10M$1024M' as a kernel boot option, but linux crashes (with no errors) and restarts. If I use a different syntax for memmap likememmap=1023M@0M` it boots fine. Do I have to specify a certain size block to reserve or could my kernel version not support reserving memory with memmap?

Maybe I'm better off using memmap=exactmap, and if so, could somebody point me to a good faq on how to use it?

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