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[PATCH] PPC64: Don't try to claim memory from OF at 1GB mark

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Some RS64-based machines (p620, F80, others) have problems with firmware
returning 0xdeadbeef instead of failure to allocations that end at the
1GB mark.

We have two options:
1. Detect the undocumented 0xdeadbeef return value and interpret it as
a failure.
2. Avoid allocating that high.

(2) is really the cleaner solution here. 768MB is plenty of room so use
that as the max alloc_top instead of 1GB.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olof Johansson 2005-08-28 21:42:10 -05:00 committed by Paul Mackerras
parent 6f9aa72743
commit 7fea82ab1a
1 changed files with 4 additions and 1 deletions
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5
arch/ppc64/kernel/prom_init.c
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@ -892,7 +892,10 @@ static void __init prom_init_mem(void)
if ( RELOC(of_platform) == PLATFORM_PSERIES_LPAR )
RELOC(alloc_top) = RELOC(rmo_top);
else
RELOC(alloc_top) = RELOC(rmo_top) = min(0x40000000ul, RELOC(ram_top));
/* Some RS64 machines have buggy firmware where claims up at 1GB
* fails. Cap at 768MB as a workaround. Still plenty of room.
*/
RELOC(alloc_top) = RELOC(rmo_top) = min(0x30000000ul, RELOC(ram_top));
prom_printf("memory layout at init:\n");
prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit));