On Tuesday 24 April 2018 06:50 PM, Tom Rini wrote:
On Tue, Apr 24, 2018 at 06:24:46PM +0530, Lokesh Vutla wrote:
Add a Kconfig entry for MMU and imply for all platforms using cache-cp15.c. Using imply instead of select so that MMU can be disabled by defconfigs when not needed.
Signed-off-by: Lokesh Vutla lokeshvutla@ti.com
arch/arm/Kconfig | 15 +++++++++++++++ arch/arm/lib/Makefile | 6 +----- 2 files changed, 16 insertions(+), 5 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index de36ab6701..fe5bff097d 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -74,6 +74,12 @@ config ARM_ASM_UNIFIED config THUMB2_KERNEL bool
+config MMU
- bool "MMU-based Paged Memory Management Support"
- help
Select if you want MMU-based virtualised addressing spacesupport by paged memory management.# If set, the workarounds for these ARM errata are applied early during U-Boot # startup. Note that in general these options force the workarounds to be # applied; no CPU-type/version detection exists, unlike the similar options in @@ -158,33 +164,40 @@ config ARM_ERRATA_855873 config CPU_ARM720T bool select SYS_CACHE_SHIFT_5
- imply MMU
config CPU_ARM920T bool select SYS_CACHE_SHIFT_5
- imply MMU
config CPU_ARM926EJS bool select SYS_CACHE_SHIFT_5
- imply MMU
config CPU_ARM946ES bool select SYS_CACHE_SHIFT_5
- imply MMU
config CPU_ARM1136 bool select SYS_CACHE_SHIFT_5
- imply MMU
config CPU_ARM1176 bool select HAS_VBAR select SYS_CACHE_SHIFT_5
- imply MMU
config CPU_V7 bool select HAS_VBAR select HAS_THUMB2 select SYS_CACHE_SHIFT_6
- imply MMU
config CPU_V7M bool @@ -200,10 +213,12 @@ config CPU_V7R config CPU_PXA bool select SYS_CACHE_SHIFT_5
- imply MMU
config CPU_SA1100 bool select SYS_CACHE_SHIFT_5
- imply MMU
config SYS_CPU default "arm720t" if CPU_ARM720T diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile index 3d3085e917..f907adc161 100644 --- a/arch/arm/lib/Makefile +++ b/arch/arm/lib/Makefile @@ -63,11 +63,7 @@ obj-y += reset.o endif
obj-y += cache.o -ifndef CONFIG_ARM64 -ifndef CONFIG_CPU_V7M -obj-y += cache-cp15.o -endif -endif +obj-$(CONFIG_MMU) += cache-cp15.o
obj-y += psci-dt.o
So, funny enough. We have CONFIG_MMU code in ARM today that I bet doesn't work and is just copy/pasted from the kernel and we should drop.
For right here, I think I'd rather see some CONFIG flag about CONFIG_SYS_ARM_CACHE_CP15 instead.
Sure will update it in next version.
Thanks and regards, Lokesh