| Message ID | 1519823458-27734-1-git-send-email-alexandre.torgue@st.com |
|---|---|
| Headers | show |
| Series | Enable DMA on STM32 MCU based on cortex-M7 | expand |
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(-) > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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(-) >> > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html