[RFC PATCH v2 0/7] ARM: NOMMU: MPU updates

Hi,

On 2017. May 19., at 11:46, Vladimir Murzin [off-list ref] wrote:

Hi,

This is an update of the existent MPU code which consist set of
clean-ups and enhancements. The most significant changes are in the way
how MPU settings sync-up for secondaries (PATCH 3/7) and more flexible
layout for memory (PATCH 7/7). Since there is no in-tree user of MPU,
support for M-class has been added (PATCH 6/7).

Thanks!

Changelog:
	    RFC -> RFC v2
	       - fixed MPU enable for v7m (PATCH 6/7)

Vladimir Murzin (7):
 ARM: NOMMU: Move out MPU setup in separate module
 ARM: NOMMU: Update MPU accessors to use cp15 helpers
 ARM: NOMMU: Rework MPU to be mostly done in C
 ARM: NOMMU: Disallow MPU for XIP
 ARM: Kconfig: Kill CONFIG_VECTORS_BASE
 ARM: V7M: Add support for MPU to M-class
 ARM: NOMMU: Use more MPU regions to cover memory

 I?ve tested these patches on my custom Atmel SAME70 armv7m board, along with the 
"ARM: Fix dma_alloc_coherent() and friends for NOMMU" patches.

Both series works fine for me. These MPU patches introduce a nice feature that it simplifies the bootloader:
do not need to setup the MPU, for example for coherent DMA region, which is described in device-tree too.

So you can add my Tested-by.


Booting Linux on physical CPU 0x0
Linux version 4.12.0-rc1 (root at devel) (gcc version 4.9.2 ( 4.9.2-10) ) #1 Fri May 19 06:26:34 EDT 2017
CPU: ARMv7-M [410fc271] revision 1 (ARMv7M), cr=00000000
CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
OF: fdt: Machine model: SAME70-sampione board
bootconsole [earlycon0] enabled
Reserved memory: created DMA memory pool at 0x73e00000, size 2 MiB
OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
Using ARMv7 PMSA Compliant MPU. Region independence: No, Used 4 of 16 regions
?


Thanks for the patches!

Regards,
Andras