The patch titled
ppc64: don't try to claim memory from OF at 1GB mark
has been added to the -mm tree. Its filename is
ppc64-dont-try-to-claim-memory-from-of-at-1gb-mark.patch
Patches currently in -mm which might be from [EMAIL PROTECTED] are
ppc64-add-vmx-save-flag-to-vpa.patch
ppc64-dont-try-to-claim-memory-from-of-at-1gb-mark.patch
add-rdinit-parameter-to-pick-early-userspace-init.patch
From: Olof Johansson <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
arch/ppc64/kernel/prom_init.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletion(-)
diff -puN
arch/ppc64/kernel/prom_init.c~ppc64-dont-try-to-claim-memory-from-of-at-1gb-mark
arch/ppc64/kernel/prom_init.c
---
devel/arch/ppc64/kernel/prom_init.c~ppc64-dont-try-to-claim-memory-from-of-at-1gb-mark
2005-08-29 23:31:34.000000000 -0700
+++ devel-akpm/arch/ppc64/kernel/prom_init.c 2005-08-29 23:31:34.000000000
-0700
@@ -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));
_
-
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