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MIPS: Loongson: Disallow 4kB pages 

Currently, with PAGE_SIZE_4KB, the kernel for loongson will hang on:

Kernel panic - not syncing: Attempted to kill init!

The possible reason is the cache aliases problem:

Loongson 2F has 64kb, 4 way L1 Cache, the way size is 16kb, which is bigger
then 4kb. so, If using 4kb page size, there is cache aliases problem.
To avoid this kind of problem, extra cache flushing.  The 2nd possible
solution is 16kb page size which avoids cache aliases without the need for
extra cache flushes.  So we disable 4kB pages until the aliasing issue is
solved.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/736/
Cc: linux-mips@linux-mips.org
Cc: zhangfx@lemote.com
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Wu Zhangjin 2009-12-01 14:55:25 +08:00 committed by Ralf Baechle
parent e1eb3a983b
commit 315fe625f8
1 changed files with 1 additions and 0 deletions
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arch/mips/Kconfig
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@ -1453,6 +1453,7 @@ choice
config PAGE_SIZE_4KB config PAGE_SIZE_4KB
bool "4kB" bool "4kB"
depends on !CPU_LOONGSON2
help help
This option select the standard 4kB Linux page size. On some This option select the standard 4kB Linux page size. On some
R3000-family processors this is the only available page size. Using R3000-family processors this is the only available page size. Using