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SubjectRe: [PATCH] MIPS: init: Prevent adding memory before PHYS_OFFSET

Thomas Bogendoerfer wrote:
> On some SGI machines (IP28 and IP30) a small region of memory is mirrored
> to pyhsical address 0 for exception vectors while rest of the memory
> is reachable at a higher physical address. ARC PROM marks this
> region as reserved, but with commit a94e4f24ec83 ("MIPS: init: Drop
> boot_mem_map") this chunk is used, when searching for start of ram,
> which breaks at least IP28 and IP30 machines. To fix this
> add_region_memory() checks for start address < PHYS_OFFSET and ignores
> these chunks.

Applied to mips-fixes.

> commit bd848d1b9235
> Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map")
> Signed-off-by: Thomas Bogendoerfer <>
> Signed-off-by: Paul Burton <>


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