diff options
| author | Olof Johansson <olof@lixom.net> | 2005-08-28 21:42:10 -0500 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-08-30 13:32:08 +1000 |
| commit | 7fea82ab1a74030f79a2adfac1af3d93b8638fc3 (patch) | |
| tree | 9bf8a09179f60ddddbebceb4df34445eff12de16 /arch/ppc64 | |
| parent | 6f9aa727433fe7647869c9b64ce2f7b5feac0052 (diff) | |
| download | linux-7fea82ab1a74030f79a2adfac1af3d93b8638fc3.tar.bz2 | |
[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/ppc64')
| -rw-r--r-- | arch/ppc64/kernel/prom_init.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/ppc64/kernel/prom_init.c b/arch/ppc64/kernel/prom_init.c index adcf972711fc..122283a1d39a 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)); |