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authorTrent Piepho <tpiepho@freescale.com>2008-12-09 06:34:58 +0300
committerKumar Gala <galak@kernel.crashing.org>2009-01-29 03:16:54 +0300
commit96051465fdc29e00dd14b484a45daac089c657f8 (patch)
tree4aa82c96d9a7e8c8b3b0c0c7f4ada4bf903ea422 /arch/powerpc/Kconfig
parentc8f3570b7e2dd070ba6da41f3ed4ffb4e1d296af (diff)
downloadlinux-96051465fdc29e00dd14b484a45daac089c657f8.tar.xz
powerpc/fsl-booke: Make CAM entries used for lowmem configurable
On booke processors, the code that maps low memory only uses up to three CAM entries, even though there are sixteen and nothing else uses them. Make this number configurable in the advanced options menu along with max low memory size. If one wants 1 GB of lowmem, then it's typically necessary to have four CAM entries. Signed-off-by: Trent Piepho <tpiepho@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/Kconfig')
-rw-r--r--arch/powerpc/Kconfig16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b408e352198c..8782b4b689a7 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -730,6 +730,22 @@ config LOWMEM_SIZE
hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
default "0x30000000"
+config LOWMEM_CAM_NUM_BOOL
+ bool "Set number of CAMs to use to map low memory"
+ depends on ADVANCED_OPTIONS && FSL_BOOKE
+ help
+ This option allows you to set the maximum number of CAM slots that
+ will be used to map low memory. There are a limited number of slots
+ available and even more limited number that will fit in the L1 MMU.
+ However, using more entries will allow mapping more low memory. This
+ can be useful in optimizing the layout of kernel virtual memory.
+
+ Say N here unless you know what you are doing.
+
+config LOWMEM_CAM_NUM
+ int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
+ default 3
+
config RELOCATABLE
bool "Build a relocatable kernel (EXPERIMENTAL)"
depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE