Hi Vlad
On 02/28/2018 02:22 PM, Vladimir Murzin wrote:
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.
I agree and I don't want to loose XIP configuration. I just want that
default stm32_defconfig covers the main MCU boards and the maximum
IPs/driver for those boards. SD cards will be the boot support that will
be supported in buildroot (except for stm32f429-disco).
But I agree, I could maybe use a frag to have a tiny configuration for
stm32 to be able to flash xip in embeded flash and provide a "basic"
support (kernel boot + console).
Regards
Alex
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(-)
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