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- convert stm32mp1 board documentation to rst format

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

- convert stm32mp1 board documentation to rst format
This commit is contained in:
Tom Rini 2020-03-02 09:20:30 -05:00
commit 8aad16916d
6 changed files with 624 additions and 520 deletions
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1
MAINTAINERS
View File

@ -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

520
board/st/stm32mp1/README
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@ -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

1
doc/board/index.rst
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@ -16,4 +16,5 @@ Board-specific doc
renesas/index
rockchip/index
sifive/index
st/index
xilinx/index

9
doc/board/st/index.rst Normal file
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@ -0,0 +1,9 @@
.. SPDX-License-Identifier: GPL-2.0+
STMicroelectronics
==================
.. toctree::
:maxdepth: 2
stm32mp1

611
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.. 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

2
drivers/rng/stm32mp1_rng.c
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@ -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);