Re: [PATCH] PPC 85xx failure with odd memory sizes and CONFIG_HIGHMEM

On Wed, Oct 03, 2007 at 02:34:42PM -0500, Rune Torgersen wrote:

quoted

From: Dale Farnsworth

The CONFIG_FSL_BOOKE mmu setup code fails when CONFIG_HIGHMEM=y
and the 3 fixed TLB entries cannot exactly map the lowmem size.
Each TLB entry can map 4MB, 16MB, 64MB or 256MB, so the failure
is observed when the kernel lowmem size is not equal to the
sum of up to 3 of those values.

Does this mean you cannot run 1G of lowmem on a 85xx?

I think you can, and maybe I should have added 1GB to my list of
sizes above.  But, my 85xx system only has 256MB, so I can't test
it.

-Dale