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 <lokeshvu...@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 space > + support 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. -- Tom
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