Merge tag 'u-boot-stm32-20200203' of https://gitlab.denx.de/u-boot/custodians/u-boot-stmWIP/02Mar2020

- convert stm32mp1 board documentation to rst format

6 files changed, 624 insertions, 520 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 1842569f24..37ff21a037 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -345,6 +345,7 @@ L:	uboot-stm32@st-md-mailman.stormreply.com (moderated for non-subscribers)
 T:	git https://gitlab.denx.de/u-boot/custodians/u-boot-stm.git
 S:	Maintained
 F:	arch/arm/mach-stm32mp/
+F:	doc/board/st/
 F:	drivers/adc/stm32-adc*
 F:	drivers/clk/clk_stm32mp1.c
 F:	drivers/gpio/stm32_gpio.c
diff --git a/board/st/stm32mp1/README b/board/st/stm32mp1/README
index 5d7465a8c8..8172d26a66 100644
--- a/board/st/stm32mp1/README
+++ b/board/st/stm32mp1/README
@@ -1,519 +1 @@
-SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
-#
-# Copyright (C) 2018 STMicroelectronics - All Rights Reserved
-#
-
-U-Boot on STMicroelectronics STM32MP15x
-=======================================
-
-1. Summary
-==========
-This is a quick instruction for setup stm32mp1 boards.
-
-2. Supported devices
-====================
-U-Boot supports STMP32MP15x SoCs: STM32MP157, STM32MP153 and STM32MP151
-
-The STM32MP15x is a Cortex-A MPU aimed at various applications.
-It features:
-- Dual core Cortex-A7 application core (Single on STM32MP151)
-- 2D/3D image composition with GPU (only on STM32MP157)
-- Standard memories interface support
-- Standard connectivity, widely inherited from the STM32 MCU family
-- Comprehensive security support
-
-Everything is supported in Linux but U-Boot is limited to:
-1. UART
-2. SDCard/MMC controller (SDMMC)
-3. NAND controller (FMC)
-4. NOR controller (QSPI)
-5. USB controller (OTG DWC2)
-6. Ethernet controller
-
-And the necessary drivers
-1. I2C
-2. STPMIC1 (PMIC and regulator)
-3. Clock, Reset, Sysreset
-4. Fuse
-
-Currently the following boards are supported:
-+ stm32mp157a-avenger96.dts
-+ stm32mp157a-dk1.dts
-+ stm32mp157c-dk2.dts
-+ stm32mp157c-ed1.dts
-+ stm32mp157c-ev1.dts
-
-3. Boot Sequences
-=================
-
-BootRom => FSBL in SYSRAM => SSBL in DDR => OS (Linux Kernel)
-
-with FSBL = First Stage Bootloader
-     SSBL = Second Stage Bootloader
-
-3 boot configurations are supported:
-
-1) The "Trusted" boot chain (defconfig_file : stm32mp15_trusted_defconfig)
-   BootRom => FSBL = Trusted Firmware-A (TF-A) => SSBL = U-Boot
-   TF-A performs a full initialization of Secure peripherals and installs a
-   secure monitor.
-   U-Boot is running in normal world and uses TF-A monitor
-   to access to secure resources.
-
-2) The "Trusted" boot chain with OP-TEE
-   (defconfig_file : stm32mp15_optee_defconfig)
-   BootRom => FSBL = Trusted Firmware-A (TF-A) => SSBL = U-Boot
-   TF-A performs a full initialization of Secure peripherals and installs OP-TEE
-   from specific partitions (teeh, teed, teex).
-   U-Boot is running in normal world and uses OP-TEE monitor to access
-   to secure resources.
-
-3) The "Basic" boot chain (defconfig_file : stm32mp15_basic_defconfig)
-   BootRom => FSBL = U-Boot SPL => SSBL = U-Boot
-   SPL has limited security initialisation
-   U-Boot is running in secure mode and provide a secure monitor to the kernel
-   with only PSCI support (Power State Coordination Interface defined by ARM).
-
-All the STM32MP15x boards supported by U-Boot use the same generic board
-stm32mp1 which support all the bootable devices.
-
-Each board is configurated only with the associated device tree.
-
-4. Device Tree Selection
-========================
-
-You need to select the appropriate device tree for your board,
-the supported device trees for stm32mp157 are:
-
-+ ev1: eval board with pmic stpmic1 (ev1 = mother board + daughter ed1)
-  dts: stm32mp157c-ev1
-
-+ ed1: daughter board with pmic stpmic1
-  dts: stm32mp157c-ed1
-
-+ dk1: Discovery board
-  dts: stm32mp157a-dk1
-
-+ dk2: Discovery board = dk1 with a BT/WiFI combo and a DSI panel
-  dts: stm32mp157c-dk2
-
-+ avenger96: Avenger96 board from Arrow Electronics
-  dts: stm32mp157a-avenger96
-
-5. Build Procedure
-==================
-
-1. Install required tools for U-Boot
-
-   + install package needed in U-Boot makefile
-     (libssl-dev, swig, libpython-dev...)
-   + install ARMv7 toolchain for 32bit Cortex-A (from Linaro,
-     from SDK for STM32MP15x, or any crosstoolchains from your distribution)
-
-2. Set the cross compiler:
-
-	# export CROSS_COMPILE=/path/to/toolchain/arm-linux-gnueabi-
-	(you can use any gcc cross compiler compatible with U-Boot)
-
-3. Select the output directory (optional)
-
-	# export KBUILD_OUTPUT=/path/to/output
-
-	for example: use one output directory for each configuration
-	# export KBUILD_OUTPUT=stm32mp15_trusted
-	# export KBUILD_OUTPUT=stm32mp15_optee
-	# export KBUILD_OUTPUT=stm32mp15_basic
-
-	you can build outside of code directory:
-	# export KBUILD_OUTPUT=../build/stm32mp15_trusted
-
-4. Configure U-Boot:
-
-	# make <defconfig_file>
-
-	- For trusted boot mode : "stm32mp15_trusted_defconfig"
-	- For trusted with OP-TEE boot mode : "stm32mp15_optee_defconfig"
-	- For basic boot mode: "stm32mp15_basic_defconfig"
-
-5. Configure the device-tree and build the U-Boot image:
-
-	# make DEVICE_TREE=<name> all
-
-  example:
-  a) trusted boot on ev1
-	# export KBUILD_OUTPUT=stm32mp15_trusted
-	# make stm32mp15_trusted_defconfig
-	# make DEVICE_TREE=stm32mp157c-ev1 all
-
-  b) trusted with OP-TEE boot on dk2
-	# export KBUILD_OUTPUT=stm32mp15_optee
-	# make stm32mp15_optee_defconfig
-	# make DEVICE_TREE=stm32mp157c-dk2 all
-
-  c) basic boot on ev1
-	# export KBUILD_OUTPUT=stm32mp15_basic
-	# make stm32mp15_basic_defconfig
-	# make DEVICE_TREE=stm32mp157c-ev1 all
-
-  d) basic boot on ed1
-	# export KBUILD_OUTPUT=stm32mp15_basic
-	# make stm32mp15_basic_defconfig
-	# make DEVICE_TREE=stm32mp157c-ed1 all
-
-  e) basic boot on dk1
-	# export KBUILD_OUTPUT=stm32mp15_basic
-	# make stm32mp15_basic_defconfig
-	# make DEVICE_TREE=stm32mp157a-dk1 all
-
-  f) basic boot on avenger96
-	# export KBUILD_OUTPUT=stm32mp15_basic
-	# make stm32mp15_basic_defconfig
-	# make DEVICE_TREE=stm32mp157a-avenger96 all
-
-6. Output files
-
-  BootRom and TF-A expect binaries with STM32 image header
-  SPL expects file with U-Boot uImage header
-
-  So in the output directory (selected by KBUILD_OUTPUT),
-  you can found the needed files:
-
-  a) For Trusted boot (with or without OP-TEE)
-   + FSBL = tf-a.stm32 (provided by TF-A compilation)
-   + SSBL = u-boot.stm32
-
-  b) For Basic boot
-   + FSBL = spl/u-boot-spl.stm32
-   + SSBL = u-boot.img
-
-6. Switch Setting for Boot Mode
-===============================
-
-You can select the boot mode, on the board with one switch :
-
-- on the daugther board ed1 with the switch SW1 : BOOT0, BOOT1, BOOT2
-
- -----------------------------------
-  Boot Mode   BOOT2   BOOT1   BOOT0
- -----------------------------------
-  Reserved	0	0	0
-  NOR		0	0	1
-  SD-Card	1	0	1
-  eMMC		0	1	0
-  NAND		0	1	1
-  Recovery	1	1	0
-  Recovery	0	0	0
-
-- on board DK1/DK2 with the switch SW1 : BOOT0, BOOT2
-  (BOOT1 forced to 0, NOR not supported)
-
- --------------------------
-  Boot Mode   BOOT2  BOOT0
- --------------------------
-  Reserved	1      0
-  SD-Card	1      1
-  Recovery	0      0
-
-- Boot mode of Avenger96 can be selected using switch S3
-
- -----------------------------------
-  Boot Mode   BOOT2   BOOT1   BOOT0
- -----------------------------------
-  Recovery	0	0	0
-  NOR		0	0	1
-  SD-Card	1	0	1
-  eMMC		0	1	0
-  NAND		0	1	1
-  Reserved	1	0	0
-  Recovery	1	1	0
-  SD-Card	1	1	1
-
-Recovery is a boot from serial link (UART/USB) and it is used with
-STM32CubeProgrammer tool to load executable in RAM and to update the flash
-devices available on the board (NOR/NAND/eMMC/SDCARD).
-The communication between HOST and board is based on
-- for UARTs : the uart protocol used with all MCU STM32
-- for USB : based on USB DFU 1.1 (without the ST extensions used on MCU STM32)
-
-7. Prepare an SDCard
-===================
-
-The minimal requirements for STMP32MP1 boot up to U-Boot are:
-- GPT partitioning (with gdisk or with sgdisk)
-- 2 fsbl partitions, named fsbl1 and fsbl2, size at least 256KiB
-- one ssbl partition for U-Boot
-
-Then the minimal GPT partition is:
-   ----- ------- --------- --------------
-  | Num | Name  | Size    |  Content     |
-   ----- ------- -------- ---------------
-  |  1  | fsbl1 | 256 KiB |  TF-A or SPL |
-  |  2  | fsbl2 | 256 KiB |  TF-A or SPL |
-  |  3  | ssbl  | enought |  U-Boot      |
-  |  *  |  -    |  -      |  Boot/Rootfs |
-   ----- ------- --------- --------------
-
-(*) add bootable partition for extlinux.conf
-    following Generic Distribution
-    (doc/README.distro for use)
-
-  according the used card reader select the block device
-  (/dev/sdx or /dev/mmcblk0)
-  in the next example I use /dev/mmcblk0
-
-for example: with gpt table with 128 entries
-
-  a) remove previous formatting
-	# sgdisk -o /dev/<SDCard dev>
-
-  b) create minimal image
-	# sgdisk --resize-table=128 -a 1 \
-		-n 1:34:545		-c 1:fsbl1 \
-		-n 2:546:1057		-c 2:fsbl2 \
-		-n 3:1058:5153		-c 3:ssbl \
-		-p /dev/<SDCard dev>
-
-	you can add other partitions for kernel
-	one partition rootfs for example:
-		-n 4:5154:		-c 4:rootfs \
-
-  c) copy the FSBL (2 times) and SSBL file on the correct partition.
-     in this example in partition 1 to 3
-
-     for basic boot mode : <SDCard dev> = /dev/mmcblk0
-	# dd if=u-boot-spl.stm32 of=/dev/mmcblk0p1
-	# dd if=u-boot-spl.stm32 of=/dev/mmcblk0p2
-	# dd if=u-boot.img of=/dev/mmcblk0p3
-
-     for trusted boot mode :
-	# dd if=tf-a.stm32 of=/dev/mmcblk0p1
-	# dd if=tf-a.stm32 of=/dev/mmcblk0p2
-	# dd if=u-boot.stm32 of=/dev/mmcblk0p3
-
-To boot from SDCard, select BootPinMode = 1 0 1 and reset.
-
-8. Prepare eMMC
-===============
-You can use U-Boot to copy binary in eMMC.
-
-In the next example, you need to boot from SDCARD and the images (u-boot-spl.stm32, u-boot.img)
-are presents on SDCARD (mmc 0) in ext4 partition 4 (bootfs).
-
-To boot from SDCard, select BootPinMode = 1 0 1 and reset.
-
-Then you update the eMMC with the next U-Boot command :
-
-a) prepare GPT on eMMC,
-	example with 2 partitions, bootfs and roots:
-
-	# setenv emmc_part "name=ssbl,size=2MiB;name=bootfs,type=linux,bootable,size=64MiB;name=rootfs,type=linux,size=512"
-	# gpt write mmc 1 ${emmc_part}
-
-b) copy SPL on eMMC on firts boot partition
-	(SPL max size is 256kB, with LBA 512, 0x200)
-
-	# ext4load mmc 0:4 0xC0000000 u-boot-spl.stm32
-	# mmc dev 1
-	# mmc partconf 1 1 1 1
-	# mmc write ${fileaddr} 0 200
-	# mmc partconf 1 1 1 0
-
-c) copy U-Boot in first GPT partition of eMMC
-
-	# ext4load mmc 0:4 0xC0000000 u-boot.img
-	# mmc dev 1
-	# part start mmc 1 1 partstart
-	# mmc write ${fileaddr} ${partstart} ${filesize}
-
-To boot from eMMC, select BootPinMode = 0 1 0 and reset.
-
-9. MAC Address
-==============
-
-Please read doc/README.enetaddr for the implementation guidelines for mac id
-usage. Basically, environment has precedence over board specific storage.
-
-For STMicroelectonics board, it is retrieved in STM32MP15x otp :
-- OTP_57[31:0] = MAC_ADDR[31:0]
-- OTP_58[15:0] = MAC_ADDR[47:32]
-
-To program a MAC address on virgin OTP words above, you can use the fuse command
-on bank 0 to access to internal OTP:
-
-    Prerequisite: check if a MAC address isn't yet programmed in OTP
-
-    1- check OTP: their value must be equal to 0
-
-       STM32MP> fuse sense 0 57 2
-       Sensing bank 0:
-       Word 0x00000039: 00000000 00000000
-
-    2- check environment variable
-
-       STM32MP> env print ethaddr
-       ## Error: "ethaddr" not defined
-
-    Example to set mac address "12:34:56:78:9a:bc"
-
-    1- Write OTP
-       STM32MP> fuse prog -y 0 57 0x78563412 0x0000bc9a
-
-    2- Read OTP
-       STM32MP> fuse sense 0 57 2
-       Sensing bank 0:
-       Word 0x00000039: 78563412 0000bc9a
-
-    3- next REBOOT :
-       ### Setting environment from OTP MAC address = "12:34:56:78:9a:bc"
-
-    4 check env update
-       STM32MP> env print ethaddr
-       ethaddr=12:34:56:78:9a:bc
-
-warning:: This MAC address provisioning can't be executed twice on the same
-          board as the OTP are protected. It is already done for the board
-          provided by STMicroelectronics.
-
-10. Coprocessor firmware
-========================
-
-U-Boot can boot the coprocessor before the kernel (coprocessor early boot).
-
-A/ Manuallly by using rproc commands (update the bootcmd)
-     Configurations
-	# env set name_copro "rproc-m4-fw.elf"
-	# env set dev_copro 0
-	# env set loadaddr_copro 0xC1000000
-
-     Load binary from bootfs partition (number 4) on SDCard (mmc 0)
-	# ext4load mmc 0:4 ${loadaddr_copro} ${name_copro}
-	=> ${filesize} updated with the size of the loaded file
-
-     Start M4 firmware with remote proc command
-	# rproc init
-	# rproc load ${dev_copro} ${loadaddr_copro} ${filesize}
-	# rproc start ${dev_copro}
-
-B/ Automatically by using FIT feature and generic DISTRO bootcmd
-
-   see examples in this directory :
-
-   Generate FIT including kernel + device tree + M4 firmware
-   with cfg with M4 boot
-        $> mkimage -f fit_copro_kernel_dtb.its fit_copro_kernel_dtb.itb
-
-    Then using DISTRO configuration file: see extlinux.conf to select
-    the correct configuration
-	=> stm32mp157c-ev1-m4
-	=> stm32mp157c-dk2-m4
-
-11. DFU support
-===============
-
-The DFU is supported on ST board.
-The env variable dfu_alt_info is automatically build, and all
-the memory present on the ST boards are exported.
-
-The mode is started by
-
-STM32MP> dfu 0
-
-On EV1 board:
-
-STM32MP> dfu 0 list
-
-DFU alt settings list:
-dev: RAM alt: 0 name: uImage layout: RAM_ADDR
-dev: RAM alt: 1 name: devicetree.dtb layout: RAM_ADDR
-dev: RAM alt: 2 name: uramdisk.image.gz layout: RAM_ADDR
-dev: eMMC alt: 3 name: sdcard_fsbl1 layout: RAW_ADDR
-dev: eMMC alt: 4 name: sdcard_fsbl2 layout: RAW_ADDR
-dev: eMMC alt: 5 name: sdcard_ssbl layout: RAW_ADDR
-dev: eMMC alt: 6 name: sdcard_bootfs layout: RAW_ADDR
-dev: eMMC alt: 7 name: sdcard_vendorfs layout: RAW_ADDR
-dev: eMMC alt: 8 name: sdcard_rootfs layout: RAW_ADDR
-dev: eMMC alt: 9 name: sdcard_userfs layout: RAW_ADDR
-dev: eMMC alt: 10 name: emmc_fsbl1 layout: RAW_ADDR
-dev: eMMC alt: 11 name: emmc_fsbl2 layout: RAW_ADDR
-dev: eMMC alt: 12 name: emmc_ssbl layout: RAW_ADDR
-dev: eMMC alt: 13 name: emmc_bootfs layout: RAW_ADDR
-dev: eMMC alt: 14 name: emmc_vendorfs layout: RAW_ADDR
-dev: eMMC alt: 15 name: emmc_rootfs layout: RAW_ADDR
-dev: eMMC alt: 16 name: emmc_userfs layout: RAW_ADDR
-dev: MTD alt: 17 name: nor_fsbl1 layout: RAW_ADDR
-dev: MTD alt: 18 name: nor_fsbl2 layout: RAW_ADDR
-dev: MTD alt: 19 name: nor_ssbl layout: RAW_ADDR
-dev: MTD alt: 20 name: nor_env layout: RAW_ADDR
-dev: MTD alt: 21 name: nand_fsbl layout: RAW_ADDR
-dev: MTD alt: 22 name: nand_ssbl1 layout: RAW_ADDR
-dev: MTD alt: 23 name: nand_ssbl2 layout: RAW_ADDR
-dev: MTD alt: 24 name: nand_UBI layout: RAW_ADDR
-dev: VIRT alt: 25 name: OTP layout: RAW_ADDR
-dev: VIRT alt: 26 name: PMIC layout: RAW_ADDR
-
-All the supported device are exported for dfu-util tool:
-
-$> dfu-util -l
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=26, name="PMIC", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=25, name="OTP", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=24, name="nand_UBI", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=23, name="nand_ssbl2", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=22, name="nand_ssbl1", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=21, name="nand_fsbl", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=20, name="nor_env", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=19, name="nor_ssbl", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=18, name="nor_fsbl2", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=17, name="nor_fsbl1", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=16, name="emmc_userfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=15, name="emmc_rootfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=14, name="emmc_vendorfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=13, name="emmc_bootfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=12, name="emmc_ssbl", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=11, name="emmc_fsbl2", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=10, name="emmc_fsbl1", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=9, name="sdcard_userfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=8, name="sdcard_rootfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=7, name="sdcard_vendorfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=6, name="sdcard_bootfs", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=5, name="sdcard_ssbl", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=4, name="sdcard_fsbl2", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=3, name="sdcard_fsbl1", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=2, name="uramdisk.image.gz", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=1, name="devicetree.dtb", serial="002700333338511934383330"
-Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=0, name="uImage", serial="002700333338511934383330"
-
-You can update the boot device:
-
-#SDCARD
-$> dfu-util -d 0483:5720 -a 3 -D tf-a-stm32mp157c-ev1-trusted.stm32
-$> dfu-util -d 0483:5720 -a 4 -D tf-a-stm32mp157c-ev1-trusted.stm32
-$> dfu-util -d 0483:5720 -a 5 -D u-boot-stm32mp157c-ev1-trusted.img
-$> dfu-util -d 0483:5720 -a 6 -D st-image-bootfs-openstlinux-weston-stm32mp1.ext4
-$> dfu-util -d 0483:5720 -a 7 -D st-image-vendorfs-openstlinux-weston-stm32mp1.ext4
-$> dfu-util -d 0483:5720 -a 8 -D st-image-weston-openstlinux-weston-stm32mp1.ext4
-$> dfu-util -d 0483:5720 -a 9 -D st-image-userfs-openstlinux-weston-stm32mp1.ext4
-
-#EMMC
-$> dfu-util -d 0483:5720 -a 10 -D tf-a-stm32mp157c-ev1-trusted.stm32
-$> dfu-util -d 0483:5720 -a 11 -D tf-a-stm32mp157c-ev1-trusted.stm32
-$> dfu-util -d 0483:5720 -a 12 -D u-boot-stm32mp157c-ev1-trusted.img
-$> dfu-util -d 0483:5720 -a 13 -D st-image-bootfs-openstlinux-weston-stm32mp1.ext4
-$> dfu-util -d 0483:5720 -a 14 -D st-image-vendorfs-openstlinux-weston-stm32mp1.ext4
-$> dfu-util -d 0483:5720 -a 15 -D st-image-weston-openstlinux-weston-stm32mp1.ext4
-$> dfu-util -d 0483:5720 -a 16 -D st-image-userfs-openstlinux-weston-stm32mp1.ext4
-
-#NOR
-$> dfu-util -d 0483:5720 -a 17 -D tf-a-stm32mp157c-ev1-trusted.stm32
-$> dfu-util -d 0483:5720 -a 18 -D tf-a-stm32mp157c-ev1-trusted.stm32
-$> dfu-util -d 0483:5720 -a 19 -D u-boot-stm32mp157c-ev1-trusted.img
-
-#NAND (UBI partition used for NAND only boot or NOR + NAND boot)
-$> dfu-util -d 0483:5720 -a 21 -D tf-a-stm32mp157c-ev1-trusted.stm32
-$> dfu-util -d 0483:5720 -a 22 -D u-boot-stm32mp157c-ev1-trusted.img
-$> dfu-util -d 0483:5720 -a 23 -D u-boot-stm32mp157c-ev1-trusted.img
-$> dfu-util -d 0483:5720 -a 24 -D st-image-weston-openstlinux-weston-stm32mp1_nand_4_256_multivolume.ubi
-
-And you can also dump the OTP and the PMIC NVM with:
-
-$> dfu-util -d 0483:5720 -a 25 -U otp.bin
-$> dfu-util -d 0483:5720 -a 26 -U pmic.bin
+see doc/board/st/stm32mp1.rst
diff --git a/doc/board/index.rst b/doc/board/index.rst
index b8b956d730..d43e536ca3 100644
--- a/doc/board/index.rst
+++ b/doc/board/index.rst
@@ -16,4 +16,5 @@ Board-specific doc
    renesas/index
    rockchip/index
    sifive/index
+   st/index
    xilinx/index
diff --git a/doc/board/st/index.rst b/doc/board/st/index.rst
new file mode 100644
index 0000000000..91f1d51b42
--- /dev/null
+++ b/doc/board/st/index.rst
@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
+STMicroelectronics
+==================
+
+.. toctree::
+   :maxdepth: 2
+
+   stm32mp1
diff --git a/doc/board/st/stm32mp1.rst b/doc/board/st/stm32mp1.rst
new file mode 100644
index 0000000000..1640bf910e
--- /dev/null
+++ b/doc/board/st/stm32mp1.rst
@@ -0,0 +1,611 @@
+.. SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+.. sectionauthor:: Patrick Delaunay <patrick.delaunay@st.com>
+
+STM32MP15x boards
+=================
+
+This is a quick instruction for setup STM32MP15x boards.
+
+Supported devices
+-----------------
+
+U-Boot supports STMP32MP15x SoCs:
+
+ - STM32MP157
+ - STM32MP153
+ - STM32MP151
+
+The STM32MP15x is a Cortex-A MPU aimed at various applications.
+
+It features:
+
+ - Dual core Cortex-A7 application core (Single on STM32MP151)
+ - 2D/3D image composition with GPU (only on STM32MP157)
+ - Standard memories interface support
+ - Standard connectivity, widely inherited from the STM32 MCU family
+ - Comprehensive security support
+
+Everything is supported in Linux but U-Boot is limited to:
+
+ 1. UART
+ 2. SD card/MMC controller (SDMMC)
+ 3. NAND controller (FMC)
+ 4. NOR controller (QSPI)
+ 5. USB controller (OTG DWC2)
+ 6. Ethernet controller
+
+And the necessary drivers
+
+ 1. I2C
+ 2. STPMIC1 (PMIC and regulator)
+ 3. Clock, Reset, Sysreset
+ 4. Fuse
+
+Currently the following boards are supported:
+
+ + stm32mp157a-avenger96.dts
+ + stm32mp157a-dk1.dts
+ + stm32mp157c-dk2.dts
+ + stm32mp157c-ed1.dts
+ + stm32mp157c-ev1.dts
+
+Boot Sequences
+--------------
+
+3 boot configurations are supported with:
+
++----------+------------------------+-------------------------+--------------+
+| **ROM**  | **FSBL**               | **SSBL**                | **OS**       |
++ **code** +------------------------+-------------------------+--------------+
+|          | First Stage Bootloader | Second Stage Bootloader | Linux Kernel |
++          +------------------------+-------------------------+--------------+
+|          | embedded RAM           | DDR                                    |
++----------+------------------------+-------------------------+--------------+
+
+The **Trusted** boot chain
+``````````````````````````
+
+defconfig_file : stm32mp15_trusted_defconfig
+
+    +-------------+-------------------------+------------+-------+
+    |  ROM code   | FSBL                    | SSBL       | OS    |
+    +             +-------------------------+------------+-------+
+    |             |Trusted Firmware-A (TF-A)| U-Boot     | Linux |
+    +-------------+-------------------------+------------+-------+
+    | TrustZone   |TF-A secure monitor                           |
+    +-------------+-------------------------+------------+-------+
+
+TF-A performs a full initialization of Secure peripherals and installs a
+secure monitor (BL32=SPMin).
+
+U-Boot is running in normal world and uses TF-A monitor to access
+to secure resources.
+
+The **Trusted** boot chain with **OP-TEE**
+``````````````````````````````````````````
+
+defconfig_file : stm32mp15_optee_defconfig
+
+    +-------------+-------------------------+------------+-------+
+    |  ROM code   | FSBL                    | SSBL       | OS    |
+    +             +-------------------------+------------+-------+
+    |             |Trusted Firmware-A (TF-A)| U-Boot     | Linux |
+    +-------------+-------------------------+------------+-------+
+    | TrustZone   |OP-TEE                                        |
+    +-------------+-------------------------+------------+-------+
+
+TF-A performs a full initialization of Secure peripherals and installs OP-TEE
+from specific partitions (teeh, teed, teex).
+
+U-Boot is running in normal world and uses OP-TEE monitor to access
+to secure resources.
+
+The **Basic** boot chain
+````````````````````````
+
+defconfig_file : stm32mp15_basic_defconfig
+
+    +-------------+------------+------------+-------+
+    |  ROM code   | FSBL       | SSBL       | OS    |
+    +             +------------+------------+-------+
+    |             |U-Boot SPL  | U-Boot     | Linux |
+    +-------------+------------+------------+-------+
+    | TrustZone   |            | PSCI from U-Boot   |
+    +-------------+------------+------------+-------+
+
+SPL has limited security initialization
+
+U-Boot is running in secure mode and provide a secure monitor to the kernel
+with only PSCI support (Power State Coordination Interface defined by ARM).
+
+All the STM32MP15x boards supported by U-Boot use the same generic board
+stm32mp1 which support all the bootable devices.
+
+Each board is configured only with the associated device tree.
+
+Device Tree Selection
+---------------------
+
+You need to select the appropriate device tree for your board,
+the supported device trees for STM32MP15x are:
+
++ ev1: eval board with pmic stpmic1 (ev1 = mother board + daughter ed1)
+
+   + stm32mp157c-ev1
+
++ ed1: daughter board with pmic stpmic1
+
+   + stm32mp157c-ed1
+
++ dk1: Discovery board
+
+   + stm32mp157a-dk1
+
++ dk2: Discovery board = dk1 with a BT/WiFI combo and a DSI panel
+
+   + stm32mp157c-dk2
+
++ avenger96: Avenger96 board from Arrow Electronics
+
+   + stm32mp157a-avenger96
+
+Build Procedure
+---------------
+
+1. Install the required tools for U-Boot
+
+   * install package needed in U-Boot makefile
+     (libssl-dev, swig, libpython-dev...)
+
+   * install ARMv7 toolchain for 32bit Cortex-A (from Linaro,
+     from SDK for STM32MP15x, or any crosstoolchains from your distribution)
+     (you can use any gcc cross compiler compatible with U-Boot)
+
+2. Set the cross compiler::
+
+    # export CROSS_COMPILE=/path/to/toolchain/arm-linux-gnueabi-
+
+3. Select the output directory (optional)::
+
+   # export KBUILD_OUTPUT=/path/to/output
+
+   for example: use one output directory for each configuration::
+
+   # export KBUILD_OUTPUT=stm32mp15_trusted
+   # export KBUILD_OUTPUT=stm32mp15_optee
+   # export KBUILD_OUTPUT=stm32mp15_basic
+
+   you can build outside of code directory::
+
+   # export KBUILD_OUTPUT=../build/stm32mp15_trusted
+
+4. Configure U-Boot::
+
+   # make <defconfig_file>
+
+   with <defconfig_file>:
+
+   - For **trusted** boot mode : **stm32mp15_trusted_defconfig**
+   - For **trusted** with OP-TEE boot mode : **stm32mp15_optee_defconfig**
+   - For basic boot mode: stm32mp15_basic_defconfig
+
+5. Configure the device-tree and build the U-Boot image::
+
+   # make DEVICE_TREE=<name> all
+
+   Examples:
+
+  a) trusted boot on ev1::
+
+     # export KBUILD_OUTPUT=stm32mp15_trusted
+     # make stm32mp15_trusted_defconfig
+     # make DEVICE_TREE=stm32mp157c-ev1 all
+
+  b) trusted with OP-TEE boot on dk2::
+
+      # export KBUILD_OUTPUT=stm32mp15_optee
+      # make stm32mp15_optee_defconfig
+      # make DEVICE_TREE=stm32mp157c-dk2 all
+
+  c) basic boot on ev1::
+
+      # export KBUILD_OUTPUT=stm32mp15_basic
+      # make stm32mp15_basic_defconfig
+      # make DEVICE_TREE=stm32mp157c-ev1 all
+
+  d) basic boot on ed1::
+
+      # export KBUILD_OUTPUT=stm32mp15_basic
+      # make stm32mp15_basic_defconfig
+      # make DEVICE_TREE=stm32mp157c-ed1 all
+
+  e) basic boot on dk1::
+
+     # export KBUILD_OUTPUT=stm32mp15_basic
+     # make stm32mp15_basic_defconfig
+     # make DEVICE_TREE=stm32mp157a-dk1 all
+
+  f) basic boot on avenger96::
+
+     # export KBUILD_OUTPUT=stm32mp15_basic
+     # make stm32mp15_basic_defconfig
+     # make DEVICE_TREE=stm32mp157a-avenger96 all
+
+6. Output files
+
+   BootRom and TF-A expect binaries with STM32 image header
+   SPL expects file with U-Boot uImage header
+
+   So in the output directory (selected by KBUILD_OUTPUT),
+   you can found the needed files:
+
+  - For **Trusted** boot (with or without OP-TEE)
+
+     - FSBL = **tf-a.stm32** (provided by TF-A compilation)
+     - SSBL = **u-boot.stm32**
+
+  - For Basic boot
+
+     - FSBL = spl/u-boot-spl.stm32
+     - SSBL = u-boot.img
+
+Switch Setting for Boot Mode
+----------------------------
+
+You can select the boot mode, on the board with one switch, to select
+the boot pin values = BOOT0, BOOT1, BOOT2
+
+  +-------------+---------+---------+---------+
+  |*Boot Mode*  | *BOOT2* | *BOOT1* | *BOOT0* |
+  +=============+=========+=========+=========+
+  | Recovery    |  0      |  0      |  0      |
+  +-------------+---------+---------+---------+
+  | NOR         |  0      |  0      |  1      |
+  +-------------+---------+---------+---------+
+  | eMMC        |  0      |  1      |  0      |
+  +-------------+---------+---------+---------+
+  | NAND        |  0      |  1      |  1      |
+  +-------------+---------+---------+---------+
+  | Reserved    |  1      |  0      |  0      |
+  +-------------+---------+---------+---------+
+  | SD-Card     |  1      |  0      |  1      |
+  +-------------+---------+---------+---------+
+  | Recovery    |  1      |  1      |  0      |
+  +-------------+---------+---------+---------+
+  | SPI-NAND    |  1      |  1      |  1      |
+  +-------------+---------+---------+---------+
+
+- on the **daugther board ed1 = MB1263** with the switch SW1
+- on **Avenger96** with switch S3 (NOR and SPI-NAND are not applicable)
+- on board **DK1/DK2** with the switch SW1 = BOOT0, BOOT2
+  with only 2 pins available (BOOT1 is forced to 0 and NOR not supported),
+  the possible value becomes:
+
+    +-------------+---------+---------+
+    |*Boot Mode*  | *BOOT2* | *BOOT0* |
+    +=============+=========+=========+
+    | Recovery    |  0      |  0      |
+    +-------------+---------+---------+
+    | NOR     (NA)|  0      |  1      |
+    +-------------+---------+---------+
+    | Reserved    |  1      |  0      |
+    +-------------+---------+---------+
+    | SD-Card     |  1      |  1      |
+    +-------------+---------+---------+
+
+Recovery is a boot from serial link (UART/USB) and it is used with
+STM32CubeProgrammer tool to load executable in RAM and to update the flash
+devices available on the board (NOR/NAND/eMMC/SD card).
+
+The communication between HOST and board is based on
+
+  - for UARTs : the uart protocol used with all MCU STM32
+  - for USB : based on USB DFU 1.1 (without the ST extensions used on MCU STM32)
+
+Prepare an SD card
+------------------
+
+The minimal requirements for STMP32MP15x boot up to U-Boot are:
+
+- GPT partitioning (with gdisk or with sgdisk)
+- 2 fsbl partitions, named fsbl1 and fsbl2, size at least 256KiB
+- one ssbl partition for U-Boot
+
+Then the minimal GPT partition is:
+
+  +-------+--------+---------+-------------+
+  | *Num* | *Name* | *Size*  | *Content*   |
+  +=======+========+=========+=============+
+  | 1     | fsbl1  | 256 KiB | TF-A or SPL |
+  +-------+--------+---------+-------------+
+  | 2     | fsbl2  | 256 KiB | TF-A or SPL |
+  +-------+--------+---------+-------------+
+  | 3     | ssbl   | enought | U-Boot      |
+  +-------+--------+---------+-------------+
+  | 4     | <any>  | <any>   | Rootfs      |
+  +-------+--------+---------+-------------+
+
+Add a 4th partition (Rootfs) marked bootable with a file extlinux.conf
+following the Generic Distribution feature (doc/README.distro for use).
+
+According the used card reader select the correct block device
+(for example /dev/sdx or /dev/mmcblk0).
+
+In the next example, it is /dev/mmcblk0
+
+For example: with gpt table with 128 entries
+
+a) remove previous formatting::
+
+     # sgdisk -o /dev/<SD card dev>
+
+b) create minimal image::
+
+    # sgdisk --resize-table=128 -a 1 \
+    -n 1:34:545		-c 1:fsbl1 \
+    -n 2:546:1057		-c 2:fsbl2 \
+    -n 3:1058:5153		-c 3:ssbl \
+    -n 4:5154:		    -c 4:rootfs \
+    -p /dev/<SD card dev>
+
+  With other partition for kernel one partition rootfs for kernel.
+
+c) copy the FSBL (2 times) and SSBL file on the correct partition.
+   in this example in partition 1 to 3
+
+   for basic boot mode : <SD card dev> = /dev/mmcblk0::
+
+    # dd if=u-boot-spl.stm32 of=/dev/mmcblk0p1
+    # dd if=u-boot-spl.stm32 of=/dev/mmcblk0p2
+    # dd if=u-boot.img of=/dev/mmcblk0p3
+
+   for trusted boot mode: ::
+
+    # dd if=tf-a.stm32 of=/dev/mmcblk0p1
+    # dd if=tf-a.stm32 of=/dev/mmcblk0p2
+    # dd if=u-boot.stm32 of=/dev/mmcblk0p3
+
+To boot from SD card, select BootPinMode = 1 0 1 and reset.
+
+Prepare eMMC
+------------
+
+You can use U-Boot to copy binary in eMMC.
+
+In the next example, you need to boot from SD card and the images
+(u-boot-spl.stm32, u-boot.img) are presents on SD card (mmc 0)
+in ext4 partition 4 (bootfs).
+
+To boot from SD card, select BootPinMode = 1 0 1 and reset.
+
+Then you update the eMMC with the next U-Boot command :
+
+a) prepare GPT on eMMC,
+   example with 2 partitions, bootfs and roots::
+
+    # setenv emmc_part "name=ssbl,size=2MiB;name=bootfs,type=linux,bootable,size=64MiB;name=rootfs,type=linux,size=512"
+    # gpt write mmc 1 ${emmc_part}
+
+b) copy SPL on eMMC on firts boot partition
+   (SPL max size is 256kB, with LBA 512, 0x200)::
+
+    # ext4load mmc 0:4 0xC0000000 u-boot-spl.stm32
+    # mmc dev 1
+    # mmc partconf 1 1 1 1
+    # mmc write ${fileaddr} 0 200
+    # mmc partconf 1 1 1 0
+
+c) copy U-Boot in first GPT partition of eMMC::
+
+    # ext4load mmc 0:4 0xC0000000 u-boo	t.img
+    # mmc dev 1
+    # part start mmc 1 1 partstart
+    # mmc write ${fileaddr} ${partstart} ${filesize}
+
+To boot from eMMC, select BootPinMode = 0 1 0 and reset.
+
+MAC Address
+-----------
+
+Please read doc/README.enetaddr for the implementation guidelines for mac id
+usage. Basically, environment has precedence over board specific storage.
+
+For STMicroelectonics board, it is retrieved in STM32MP15x OTP :
+
+ - OTP_57[31:0] = MAC_ADDR[31:0]
+ - OTP_58[15:0] = MAC_ADDR[47:32]
+
+To program a MAC address on virgin OTP words above, you can use the fuse command
+on bank 0 to access to internal OTP:
+
+Prerequisite: check if a MAC address isn't yet programmed in OTP
+
+1) check OTP: their value must be equal to 0
+
+   STM32MP> fuse sense 0 57 2
+   Sensing bank 0:
+   Word 0x00000039: 00000000 00000000
+
+2) check environment variable
+
+   STM32MP> env print ethaddr
+   ## Error: "ethaddr" not defined
+
+Example to set mac address "12:34:56:78:9a:bc"
+
+1) Write OTP::
+
+    STM32MP> fuse prog -y 0 57 0x78563412 0x0000bc9a
+
+2) Read OTP::
+
+    STM32MP> fuse sense 0 57 2
+    Sensing bank 0:
+    Word 0x00000039: 78563412 0000bc9a
+
+3) next REBOOT, in the trace::
+
+    ### Setting environment from OTP MAC address = "12:34:56:78:9a:bc"
+
+4) check env update::
+
+    STM32MP> env print ethaddr
+    ethaddr=12:34:56:78:9a:bc
+
+.. warning:: This command can't be executed twice on the same board as
+             OTP are protected. It is already done for the board
+             provided by STMicroelectronics.
+
+Coprocessor firmware
+--------------------
+
+U-Boot can boot the coprocessor before the kernel (coprocessor early boot).
+
+a) Manuallly by using rproc commands (update the bootcmd)
+
+   Configurations::
+
+	# env set name_copro "rproc-m4-fw.elf"
+	# env set dev_copro 0
+	# env set loadaddr_copro 0xC1000000
+
+   Load binary from bootfs partition (number 4) on SD card (mmc 0)::
+
+	# ext4load mmc 0:4 ${loadaddr_copro} ${name_copro}
+
+   => ${filesize} variable is updated with the size of the loaded file.
+
+   Start M4 firmware with remote proc command::
+
+	# rproc init
+	# rproc load ${dev_copro} ${loadaddr_copro} ${filesize}
+	# rproc start ${dev_copro}"00270033
+
+b) Automatically by using FIT feature and generic DISTRO bootcmd
+
+   see examples in the board stm32mp1 directory: fit_copro_kernel_dtb.its
+
+   Generate FIT including kernel + device tree + M4 firmware with cfg with M4 boot::
+
+   $> mkimage -f fit_copro_kernel_dtb.its fit_copro_kernel_dtb.itb
+
+   Then using DISTRO configuration file: see extlinux.conf to select the correct
+   configuration:
+
+   - stm32mp157c-ev1-m4
+   - stm32mp157c-dk2-m4
+
+DFU support
+-----------
+
+The DFU is supported on ST board.
+
+The env variable dfu_alt_info is automatically build, and all
+the memory present on the ST boards are exported.
+
+The dfu mode is started by the command::
+
+  STM32MP> dfu 0
+
+On EV1 board, booting from SD card, without OP-TEE::
+
+  STM32MP> dfu 0 list
+  DFU alt settings list:
+  dev: RAM alt: 0 name: uImage layout: RAM_ADDR
+  dev: RAM alt: 1 name: devicetree.dtb layout: RAM_ADDR
+  dev: RAM alt: 2 name: uramdisk.image.gz layout: RAM_ADDR
+  dev: eMMC alt: 3 name: sdcard_fsbl1 layout: RAW_ADDR
+  dev: eMMC alt: 4 name: sdcard_fsbl2 layout: RAW_ADDR
+  dev: eMMC alt: 5 name: sdcard_ssbl layout: RAW_ADDR
+  dev: eMMC alt: 6 name: sdcard_bootfs layout: RAW_ADDR
+  dev: eMMC alt: 7 name: sdcard_vendorfs layout: RAW_ADDR
+  dev: eMMC alt: 8 name: sdcard_rootfs layout: RAW_ADDR
+  dev: eMMC alt: 9 name: sdcard_userfs layout: RAW_ADDR
+  dev: eMMC alt: 10 name: emmc_fsbl1 layout: RAW_ADDR
+  dev: eMMC alt: 11 name: emmc_fsbl2 layout: RAW_ADDR
+  dev: eMMC alt: 12 name: emmc_ssbl layout: RAW_ADDR
+  dev: eMMC alt: 13 name: emmc_bootfs layout: RAW_ADDR
+  dev: eMMC alt: 14 name: emmc_vendorfs layout: RAW_ADDR
+  dev: eMMC alt: 15 name: emmc_rootfs layout: RAW_ADDR
+  dev: eMMC alt: 16 name: emmc_userfs layout: RAW_ADDR
+  dev: MTD alt: 17 name: nor_fsbl1 layout: RAW_ADDR
+  dev: MTD alt: 18 name: nor_fsbl2 layout: RAW_ADDR
+  dev: MTD alt: 19 name: nor_ssbl layout: RAW_ADDR
+  dev: MTD alt: 20 name: nor_env layout: RAW_ADDR
+  dev: MTD alt: 21 name: nand_fsbl layout: RAW_ADDR
+  dev: MTD alt: 22 name: nand_ssbl1 layout: RAW_ADDR
+  dev: MTD alt: 23 name: nand_ssbl2 layout: RAW_ADDR
+  dev: MTD alt: 24 name: nand_UBI layout: RAW_ADDR
+  dev: VIRT alt: 25 name: OTP layout: RAW_ADDR
+  dev: VIRT alt: 26 name: PMIC layout: RAW_ADDR
+
+All the supported device are exported for dfu-util tool::
+
+  $> dfu-util -l
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=26, name="PMIC", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=25, name="OTP", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=24, name="nand_UBI", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=23, name="nand_ssbl2", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=22, name="nand_ssbl1", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=21, name="nand_fsbl", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=20, name="nor_env", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=19, name="nor_ssbl", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=18, name="nor_fsbl2", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=17, name="nor_fsbl1", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=16, name="emmc_userfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=15, name="emmc_rootfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=14, name="emmc_vendorfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=13, name="emmc_bootfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=12, name="emmc_ssbl", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=11, name="emmc_fsbl2", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=10, name="emmc_fsbl1", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=9, name="sdcard_userfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=8, name="sdcard_rootfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=7, name="sdcard_vendorfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=6, name="sdcard_bootfs", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=5, name="sdcard_ssbl", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=4, name="sdcard_fsbl2", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=3, name="sdcard_fsbl1", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=2, name="uramdisk.image.gz", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=1, name="devicetree.dtb", serial="002700333338511934383330"
+  Found DFU: [0483:5720] ver=9999, devnum=99, cfg=1, intf=0, alt=0, name="uImage", serial="002700333338511934383330"
+
+You can update the boot device:
+
+- SD card (mmc0) ::
+
+  $> dfu-util -d 0483:5720 -a 3 -D tf-a-stm32mp157c-ev1-trusted.stm32
+  $> dfu-util -d 0483:5720 -a 4 -D tf-a-stm32mp157c-ev1-trusted.stm32
+  $> dfu-util -d 0483:5720 -a 5 -D u-boot-stm32mp157c-ev1-trusted.img
+  $> dfu-util -d 0483:5720 -a 6 -D st-image-bootfs-openstlinux-weston-stm32mp1.ext4
+  $> dfu-util -d 0483:5720 -a 7 -D st-image-vendorfs-openstlinux-weston-stm32mp1.ext4
+  $> dfu-util -d 0483:5720 -a 8 -D st-image-weston-openstlinux-weston-stm32mp1.ext4
+  $> dfu-util -d 0483:5720 -a 9 -D st-image-userfs-openstlinux-weston-stm32mp1.ext4
+
+- EMMC (mmc1)::
+
+  $> dfu-util -d 0483:5720 -a 10 -D tf-a-stm32mp157c-ev1-trusted.stm32
+  $> dfu-util -d 0483:5720 -a 11 -D tf-a-stm32mp157c-ev1-trusted.stm32
+  $> dfu-util -d 0483:5720 -a 12 -D u-boot-stm32mp157c-ev1-trusted.img
+  $> dfu-util -d 0483:5720 -a 13 -D st-image-bootfs-openstlinux-weston-stm32mp1.ext4
+  $> dfu-util -d 0483:5720 -a 14 -D st-image-vendorfs-openstlinux-weston-stm32mp1.ext4
+  $> dfu-util -d 0483:5720 -a 15 -D st-image-weston-openstlinux-weston-stm32mp1.ext4
+  $> dfu-util -d 0483:5720 -a 16 -D st-image-userfs-openstlinux-weston-stm32mp1.ext4
+
+- NOR::
+
+  $> dfu-util -d 0483:5720 -a 17 -D tf-a-stm32mp157c-ev1-trusted.stm32
+  $> dfu-util -d 0483:5720 -a 18 -D tf-a-stm32mp157c-ev1-trusted.stm32
+  $> dfu-util -d 0483:5720 -a 19 -D u-boot-stm32mp157c-ev1-trusted.img
+
+- NAND (UBI partition used for NAND only boot or NOR + NAND boot)::
+
+  $> dfu-util -d 0483:5720 -a 21 -D tf-a-stm32mp157c-ev1-trusted.stm32
+  $> dfu-util -d 0483:5720 -a 22 -D u-boot-stm32mp157c-ev1-trusted.img
+  $> dfu-util -d 0483:5720 -a 23 -D u-boot-stm32mp157c-ev1-trusted.img
+  $> dfu-util -d 0483:5720 -a 24 -D st-image-weston-openstlinux-weston-stm32mp1_nand_4_256_multivolume.ubi
+
+- you can also dump the OTP and the PMIC NVM with::
+
+  $> dfu-util -d 0483:5720 -a 25 -U otp.bin
+  $> dfu-util -d 0483:5720 -a 26 -U pmic.bin
diff --git a/drivers/rng/stm32mp1_rng.c b/drivers/rng/stm32mp1_rng.c
index dab3b995eb..e0f0a66c6e 100644
--- a/drivers/rng/stm32mp1_rng.c
+++ b/drivers/rng/stm32mp1_rng.c
@@ -33,7 +33,7 @@ struct stm32_rng_platdata {
 
 static int stm32_rng_read(struct udevice *dev, void *data, size_t len)
 {
-	int retval = 0, i;
+	int retval, i;
 	u32 sr, count, reg;
 	size_t increment;
 	struct stm32_rng_platdata *pdata = dev_get_platdata(dev);