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MIPS: init: Prevent adding memory before PHYS_OFFSET
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 commita94e4f24ec
("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. Fixes:a94e4f24ec
("MIPS: init: Drop boot_mem_map") Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de> Signed-off-by: Paul Burton <paul.burton@mips.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: James Hogan <jhogan@kernel.org> Cc: linux-mips@vger.kernel.org Cc: linux-kernel@vger.kernel.org
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@ -108,6 +108,9 @@ void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
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return;
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}
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if (start < PHYS_OFFSET)
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return;
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memblock_add(start, size);
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/* Reserve any memory except the ordinary RAM ranges. */
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switch (type) {
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