Home » Forums » Linux » Linux general

memmap usage in 2.6.18 kernel

Submitted by er21012
on March 6, 2007 - 1:13pm

Hi, I'm trying to configure an HP DL585 server running the 2.6.18 kernel, x86_64, with 8GB of RAM in such a way that the server "sees" the first 3 Gigs of RAM, and then the last 4 Gigs of RAM....leaving me, 1 Gig, 3072-->4096, free for DMA access.

to do so, I am setting up in grub.conf

memmap=exactmap memmap=3072M@0M memmap=4096M@4096M

With this, the system hangs when booting the kernel with the message:

kernel direct mapping tables 200000000, 8000@11000

Does anyone know what Im doing wrong?

Thanks.

‹ localtime() function is having problem with getenv(), received signal SIGSEGV, so segmentation fault Memory problem with flash and firefox / System stops working ›

memmap usage

Anonymous (not verified)
on
September 18, 2007 - 4:43am

I am trying to reserve 702KB of memory using cmd line parameter

mem=32000K memmap=702K$15360K

My ARM ARM1026EJ based board having 32MB of memory. Where I want to reserve
702KB of memory starting at 15M(15360K).

When the kernel boots it crashes showing the message
"Unable to handle kernel paging request at virtual address c097f00c"
Can anyone suggest me whether reserving fraction of 1MB of memory is possible or not.

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.