On May 21, 2008, at 3:55 PM, Rune Torgersen wrote:
Rune Torgersen wrote:
[EMAIL PROTECTED] wrote:
Hi
I am trying to enable 1 GB of lowmem on a Freescale 8280.
In arch/ppc this was easilly done by:
CONFIG_ADVANCED_OPTIONS=y
CONFIG_HIGHMEM_START=0xfe000000
CONFIG_LOWMEM_SIZE_BOOL=y
CONFIG_LOWMEM_SIZE=0x40000000
CONFIG_KERNEL_START_BOOL=y
CONFIG_KERNEL_START=0xa0000000
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 2.6.25.4, but
not at all with 2.6.25.4-rt[13]
Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x80000000. Now it
works in both vaniulla an d RT kernel.
We should really add some sanity check on CONFIG_TASK_SIZE vs
KERNEL_START.
- k
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