From: robert lazarski
Sent: Thursday, November 29, 2007 7:00 AM
Subject: Re: The question about the high memory support on MPC8360?
I also have a requirement to use more than 768MB and 0x30000000. I
have other problems at the moment, so I haven't tested this completely
yet. My limited understanding, though, is that to use more than 768MB
you have to change your kernel configuration, including shifting the
kernel start address. This is what I plan on testing for 1GB when I
have time:
=20
CONFIG_ADVANCED_OPTIONS=3Dy
CONFIG_LOWMEM_SIZE_BOOL=3Dy
CONFIG_LOWMEM_SIZE=3D0x40000000
CONFIG_KERNEL_START_BOOL=3Dy
CONFIG_KERNEL_START=3D0xa0000000
# CONFIG_CONSISTENT_START_BOOL is not set
# CONFIG_CONSISTENT_SIZE_BOOL is not set
# CONFIG_BOOT_LOAD_BOOL is not set
=20
If that works for current kernels, please respond to the list ;-) .

This is how I do 1G of mem on a /arch/ppc kernel. A short while (couple
of weeks ago) I commented about thei s on a thread about setting up the
TLB handlers on arch/powerpc, and asked if this was going to be possible
to do, and basically got a resouding NO as answer.

WHich means I'll be sticking to arch/ppc for a while yet.
It would be nice to have this also working on arch/powerpc though.