Re: how to support more than 512MB RAM for MIPS32 ?

[Ralf Baechle <ralf@linux-mips.org>]

On Wed, Nov 25, 2009 at 11:31:14PM +0800, Figo.zhang wrote:

> how to do map extra RAM to any ouside I/O space?
> it is just motify:
> 
> 1. arch/mips/kernel/setup.c: bootm_init()function, motity the define
> "HIGHMEM_START", for me: 
> #define HIGHMEM_START 0x2000,0000   //512MB

Leave HIGHMEM_START unchanged; it should always be 512MB no matter what
the actual memory addresses of a particular platform are.  The kernel
needs to treat anything above 512MB differently because it's not
permanently mapped and HIGHMEM_START stands for this limit.

  Ralf