wii: use both mem1 and mem2 as ram

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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>

...

This commit is contained in:

Albert Herranz 2009-12-12 06:31:53 +00:00 • committed by Grant Likely

parent 02d748a9ee

commit de32400dd2

5 changed files with 106 additions and 7 deletions

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4

arch/powerpc/mm/init_32.c

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10

arch/powerpc/mm/mmu_decl.h

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32

arch/powerpc/mm/pgtable_32.c

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4

arch/powerpc/mm/ppc_mmu_32.c

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63

arch/powerpc/platforms/embedded6xx/wii.c

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