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

[Szemző András]

Hi,

> On 2017. May 19., at 11:46, Vladimir Murzin <vladimir.murzin at arm.com> 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