Max RAM for Linux only 1GB?

Matt Porter mporter at
Sat Nov 1 05:25:00 EST 2003

On Fri, Oct 31, 2003 at 08:58:21AM -0800, Prakash Kanthi wrote:
> Folks,
> I have over 1GB DIMM RAM on my board running PPC 405.
> How can i ioremap that to my OS? As Linux virtual
> space starts at 0xC0000000, we have only 1GB more for
> all virtual space mappings.
> Even if i move 0xC0000000 to 0x80000000, what will
> happen to TLB settings? Any problem there to map 1GB
> additional RAM?
> Any idea as to how i can do this?

Use CONFIG_HIGHMEM or move KERNELBASE like you suggest.

You don't ioremap your system memory (well, under normal


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