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author | Albert Herranz <albert_herranz@yahoo.es> | 2009-12-12 07:31:53 +0100 |
---|---|---|
committer | Grant Likely <grant.likely@secretlab.ca> | 2009-12-13 06:24:31 +0100 |
commit | de32400dd26e743c5d500aa42d8d6818b79edb73 (patch) | |
tree | 5fee868e4fac044dca4fb3a18532b67b62c90c96 /arch/powerpc/mm/init_32.c | |
parent | wii: bootwrapper: add fixup to calc useable mem2 (diff) | |
download | linux-de32400dd26e743c5d500aa42d8d6818b79edb73.tar.xz linux-de32400dd26e743c5d500aa42d8d6818b79edb73.zip |
wii: use both mem1 and mem2 as ram
The Nintendo Wii video game console has two discontiguous RAM regions:
- MEM1: 24MB @ 0x00000000
- MEM2: 64MB @ 0x10000000
Unfortunately, the kernel currently does not support discontiguous RAM
memory regions on 32-bit PowerPC platforms.
This patch adds a series of workarounds to allow the use of the second
memory region (MEM2) as RAM by the kernel.
Basically, a single range of memory from the beginning of MEM1 to the
end of MEM2 is reported to the kernel, and a memory reservation is
created for the hole between MEM1 and MEM2.
With this patch the system is able to use all the available RAM and not
just ~27% of it.
This will no longer be needed when proper discontig memory support
for 32-bit PowerPC is added to the kernel.
Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/powerpc/mm/init_32.c')
-rw-r--r-- | arch/powerpc/mm/init_32.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c index 9ddcfb4dc139..703c7c2e0d9f 100644 --- a/arch/powerpc/mm/init_32.c +++ b/arch/powerpc/mm/init_32.c @@ -131,9 +131,13 @@ void __init MMU_init(void) MMU_setup(); if (lmb.memory.cnt > 1) { +#ifndef CONFIG_WII lmb.memory.cnt = 1; lmb_analyze(); printk(KERN_WARNING "Only using first contiguous memory region"); +#else + wii_memory_fixups(); +#endif } total_lowmem = total_memory = lmb_end_of_DRAM() - memstart_addr; |