[PATCH v2 0/4] Enable DMA on STM32 MCU based on cortex-M7

[Vladimir Murzin]

On 28/02/18 13:10, Alexandre Torgue wrote:
> This series enable DMA on several STM32 MCU based on cortex-M7.
> To make it possible, a dedicated dma pool memory area has to be
> created. This patchset activate also ARM_MPU flag which will configure 
> MPU (Memory Protection Unit) according to devicetree information (mem
> and dma-pool). Note that on cortex-M7 DMA has to use a NO cache-able 
> memory region.
> 
> 
> v2:
> -select ARM_MPU in mach-stm32 Kconfig instead of add it in stm32 defconfig
> -Remove XIP configuration from stm32_defconfig: ARM_MPU flag imposes XIP image
> to be aligned on 1MB. It is currently not the case. I had choice to either
> modify current XIP start address to be aligned on 1MB or to remove global
> configuration. I make choice to remove XIP configuration. Indeed, SD card
> support has been recently added for most of STM32 MCU boards (except for
> stm32f429-disco). As kernel is growing up for stm32 it will be more and more
> difficult to flash it in embeded flash (max size: 2MB).

It is sad we are loosing XIP configuration - it used to uncover some bugs
in a past. Probably, you might consider to have stm32 tiny (+xip) defconfig
for those who do not want/need all-in-one kernel.

Cheers
Vladimir

> -fix typo in commit message
> 
> Regards
> Alex
> 
> Alexandre Torgue (4):
>   ARM: dts: stm32: add DMA memory pool on MCU which embed a cortex-M7
>   ARM: configs: stm32: remove XIP configuration
>   ARM: stm32: Select ARM_MPU for cortex-M7 machines
>   ARM: dts: stm32: enable dma on MCU which embed a cortex-M7
> 
>  arch/arm/boot/dts/stm32746g-eval.dts   | 21 +++++++++++++++++++++
>  arch/arm/boot/dts/stm32f769-disco.dts  | 21 +++++++++++++++++++++
>  arch/arm/boot/dts/stm32h743i-disco.dts | 21 +++++++++++++++++++++
>  arch/arm/boot/dts/stm32h743i-eval.dts  | 21 +++++++++++++++++++++
>  arch/arm/configs/stm32_defconfig       |  2 --
>  arch/arm/mach-stm32/Kconfig            |  3 +++
>  6 files changed, 87 insertions(+), 2 deletions(-)
>