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

On Oct 3, 2007, at 2:34 PM, 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?

On 82xx I run 1G of lowmem, and when we finaly upgrade our product  
to a
85xx something, Iw was planning on doing the same.

The code would have to change to allow for 1G of lowmem.

Max lowmem with KERNELBASE @ 0xc000_0000 is 768M.

- k