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ARM: mpu: Allow enabling of the MPU via kconfig 

Allows the user to select MPU support when compiling for ARM processors
that support the PMSAv7.

This ensures that CONFIG_SMP depends on the MPU in the case that no MMU
is present.

CONFIG_SMP_ON_UP is not implemented for nommu, so introduce an MMU
dependency there.

Signed-off-by: Jonathan Austin <jonathan.austin@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Jonathan Austin 2013-02-22 18:56:04 +00:00
parent eb08375ea6
commit 801bb21c60
2 changed files with 13 additions and 2 deletions
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4
arch/arm/Kconfig
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@ -1414,7 +1414,7 @@ config SMP
depends on CPU_V6K || CPU_V7
depends on GENERIC_CLOCKEVENTS
depends on HAVE_SMP
depends on MMU
depends on MMU || ARM_MPU
select USE_GENERIC_SMP_HELPERS
help
This enables support for systems with more than one CPU. If you have
@ -1435,7 +1435,7 @@ config SMP
config SMP_ON_UP
bool "Allow booting SMP kernel on uniprocessor systems (EXPERIMENTAL)"
depends on SMP && !XIP_KERNEL
depends on SMP && !XIP_KERNEL && MMU
default y
help
SMP kernels contain instructions which fail on non-SMP processors.

11
arch/arm/Kconfig-nommu
View File

@ -50,3 +50,14 @@ config REMAP_VECTORS_TO_RAM
Otherwise, say 'y' here. In this case, the kernel will require
external support to redirect the hardware exception vectors to
the writable versions located at DRAM_BASE.
config ARM_MPU
bool 'Use the ARM v7 PMSA Compliant MPU'
default y
help
Some ARM systems without an MMU have instead a Memory Protection
Unit (MPU) that defines the type and permissions for regions of
memory.
If your CPU has an MPU then you should choose 'y' here unless you
know that you do not want to use the MPU.