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authorOlof Johansson <olof@lixom.net>2005-08-28 21:42:10 -0500
committerPaul Mackerras <paulus@samba.org>2005-08-30 13:32:08 +1000
commit7fea82ab1a74030f79a2adfac1af3d93b8638fc3 (patch)
tree9bf8a09179f60ddddbebceb4df34445eff12de16 /arch
parent6f9aa727433fe7647869c9b64ce2f7b5feac0052 (diff)
[PATCH] PPC64: Don't try to claim memory from OF at 1GB mark
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/ppc64/kernel/prom_init.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/ppc64/kernel/prom_init.c b/arch/ppc64/kernel/prom_init.c
index adcf972711f..122283a1d39 100644
--- a/arch/ppc64/kernel/prom_init.c
+++ b/arch/ppc64/kernel/prom_init.c
@@ -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));