1 GB lowmem

Rune Torgersen runet at innovsys.com
Thu May 22 06:55:59 EST 2008

Rune Torgersen wrote:
> linuxppc-dev-bounces+runet=innovsys.com at ozlabs.org wrote:
>> Hi
>> I am trying to enable 1 GB of lowmem on a Freescale 8280.
>> In arch/ppc this was easilly done by:
>> CONFIG_LOWMEM_SIZE=0x40000000
>> This does not work in arch/powerpc. CPU hangs as soon as init starts.
>> Any ideas what to look at, what to change?
>> The reason I want to do this is because I cannot get highmem support
>> to work when using CONFIG_PREEMPT_RT.
>> (hitting a bug_on in kmap_atomic)
> Scratch that. 1 GB lowmem works with vanilla, but
> not at all with[13]

Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x80000000. Now it
works in both vaniulla an d RT kernel.
Highmem still doesn't work.

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