269 lines
7.5 KiB
Plaintext
269 lines
7.5 KiB
Plaintext
SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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#
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# Copyright (C) 2018 STMicroelectronics - All Rights Reserved
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#
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U-Boot on STMicroelectronics STM32MP1
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======================================
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1. Summary
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==========
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This is a quick instruction for setup stm32mp1 boards.
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2. Supported devices
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====================
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U-Boot supports one STMP32MP1 SoCs: STM32MP157
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The STM32MP157 is a Cortex-A MPU aimed at various applications.
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It features:
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- Dual core Cortex-A7 application core
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- 2D/3D image composition with GPU
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- Standard memories interface support
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- Standard connectivity, widely inherited from the STM32 MCU family
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- Comprehensive security support
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Everything is supported in Linux but U-Boot is limited to:
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1. UART
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2. SDCard/MMC controller (SDMMC)
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And the necessary drivers
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1. I2C
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2. STPMU1
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2. STPMU1 (PMIC and regulator)
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3. Clock, Reset, Sysreset
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4. Fuse
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Currently the following boards are supported:
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+ stm32mp157c-ev1
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+ stm32mp157c-ed1
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3. Boot Sequences
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=================
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BootRom => FSBL in SYSRAM => SSBL in DDR => OS (Linux Kernel)
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with FSBL = First Stage Bootloader
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SSBL = Second Stage Bootloader
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One boot configuration is supported:
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The "Basic" boot chain (defconfig_file : stm32mp15_basic_defconfig)
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BootRom => FSBL = U-Boot SPL => SSBL = U-Boot
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SPL has limited security initialisation
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U-Boot is running in secure mode and provide a secure monitor to the kernel
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with only PSCI support (Power State Coordination Interface defined by ARM)
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All the STM32MP1 board supported by U-Boot use the same generic board
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stm32mp1 which support all the bootable devices.
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Each board is configurated only with the associated device tree.
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4. Device Tree Selection
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========================
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You need to select the appropriate device tree for your board,
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the supported device trees for stm32mp157 are:
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+ ev1: eval board with pmic stpmu1 (ev1 = mother board + daughter ed1)
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dts: stm32mp157c-ev1
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+ ed1: daughter board with pmic stpmu1
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dts: stm32mp157c-ed1
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5. Build Procedure
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==================
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1. Install required tools for U-Boot
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+ install package needed in U-Boot makefile
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(libssl-dev, swig, libpython-dev...)
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+ install ARMv7 toolchain for 32bit Cortex-A (from Linaro,
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from SDK for STM32MP1, or any crosstoolchains from your distribution)
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2. Set the cross compiler:
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# export CROSS_COMPILE=/path/to/toolchain/arm-linux-gnueabi-
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(you can use any gcc cross compiler compatible with U-Boot)
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3. Select the output directory (optional)
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# export KBUILD_OUTPUT=/path/to/output
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for example: use one output directory for each configuration
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# export KBUILD_OUTPUT=stm32mp15_basic
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4. Configure the U-Boot:
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# make <defconfig_file>
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- For basic boot mode: "stm32mp15_basic_defconfig"
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5. Configure the device-tree and build the U-Boot image:
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# make DEVICE_TREE=<name> all
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example:
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basic boot on ev1
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# export KBUILD_OUTPUT=stm32mp15_basic
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# make stm32mp15_basic_defconfig
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# make DEVICE_TREE=stm32mp157c-ev1 all
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basic boot on ed1
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# export KBUILD_OUTPUT=stm32mp15_basic
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# make stm32mp15_basic_defconfig
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# make DEVICE_TREE=stm32mp157c-ed1 all
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6. Output files
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BootRom and TF-A expect binaries with STM32 image header
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SPL expects file with U-Boot uImage header
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So in the output directory (selected by KBUILD_OUTPUT),
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you can found the needed files:
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+ FSBL = spl/u-boot-spl.stm32
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+ SSBL = u-boot.img
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6. Switch Setting for Boot Mode
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===============================
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You can select the boot mode, on the board ed1 with the switch SW1
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-----------------------------------
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Boot Mode BOOT2 BOOT1 BOOT0
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-----------------------------------
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Reserved 0 0 0
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NOR 0 0 1
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SD-Card 1 1 1
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SD-Card 1 0 1
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eMMC 0 1 0
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NAND 0 1 1
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Recovery 1 1 0
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Recovery 0 0 0
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Recovery is a boot from serial link (UART/USB) and it is used with
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STM32CubeProgrammer tool to load executable in RAM and to update the flash
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devices available on the board (NOR/NAND/eMMC/SDCARD).
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The communication between HOST and board is based on
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- for UARTs : the uart protocol used with all MCU STM32
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- for USB : based on USB DFU 1.1 (without the ST extensions used on MCU STM32)
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7. Prepare an SDCard
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===================
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The minimal requirements for STMP32MP1 boot up to U-Boot are:
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- GPT partitioning (with gdisk or with sgdisk)
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- 2 fsbl partitions, named fsbl1 and fsbl2, size at least 256KiB
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- one ssbl partition for U-Boot
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Then the minimal GPT partition is:
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----- ------- --------- -------------
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| Num | Name | Size | Content |
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----- ------- -------- --------------
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| 1 | fsbl1 | 256 KiB | TF-A or SPL |
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| 2 | fsbl2 | 256 KiB | TF-A or SPL |
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| 3 | ssbl | enought | U-Boot |
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| * | - | - | Boot/Rootfs|
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----- ------- --------- -------------
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(*) add bootable partition for extlinux.conf
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following Generic Distribution
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(doc/README.distro for use)
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according the used card reader select the block device
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(/dev/sdx or /dev/mmcblk0)
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in the next example I use /dev/mmcblk0
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for example: with gpt table with 128 entries
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a) remove previous formatting
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# sgdisk -o /dev/<SDCard dev>
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b) create minimal image
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# sgdisk --resize-table=128 -a 1 \
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-n 1:34:545 -c 1:fsbl1 \
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-n 2:546:1057 -c 2:fsbl2 \
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-n 3:1058:5153 -c 3:ssbl \
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-p /dev/<SDCard dev>
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you can add other partitions for kernel
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one partition rootfs for example:
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-n 3:5154: -c 4:rootfs
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c) copy the FSBL (2 times) and SSBL file on the correct partition.
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in this example in partition 1 to 3
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for basic boot mode : <SDCard dev> = /dev/mmcblk0
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# dd if=u-boot-spl.stm32 of=/dev/mmcblk0p1
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# dd if=u-boot-spl.stm32 of=/dev/mmcblk0p2
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# dd if=u-boot.img of=/dev/mmcblk0p3
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To boot from SDCard, select BootPinMode = 1 1 1 and reset.
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8. Prepare eMMC
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===============
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You can use U-Boot to copy binary in eMMC.
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In the next example, you need to boot from SDCARD and the images (u-boot-spl.stm32, u-boot.img)
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are presents on SDCARD (mmc 0) in ext4 partition 4 (bootfs).
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To boot from SDCard, select BootPinMode = 1 1 1 and reset.
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Then you update the eMMC with the next U-Boot command :
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a) prepare GPT on eMMC,
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example with 2 partitions, bootfs and roots:
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# setenv emmc_part "name=ssbl,size=2MiB;name=bootfs,type=linux,bootable,size=64MiB;name=rootfs,type=linux,size=512"
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# gpt write mmc 1 ${emmc_part}
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b) copy SPL on eMMC on firts boot partition
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(SPL max size is 256kB, with LBA 512, 0x200)
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# ext4load mmc 0:4 0xC0000000 u-boot-spl.stm32
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# mmc dev 1
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# mmc partconf 1 1 1 1
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# mmc write ${fileaddr} 0 200
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# mmc partconf 1 1 1 0
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b) copy U-Boot in first GPT partition of eMMC
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# ext4load mmc 0:4 0xC0000000 u-boot.img
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# mmc dev 1
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# part start mmc 1 1 partstart
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# part size mmc 1 1 partsize
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# mmc write ${fileaddr} ${partstart} ${partsize}
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To boot from eMMC, select BootPinMode = 0 1 0 and reset.
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9. MAC Address
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==============
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Please read doc/README.enetaddr for the implementation guidelines for mac id
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usage. Basically, environment has precedence over board specific storage.
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Mac id storage and retrieval in stm32mp otp :
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- OTP_57[31:0] = MAC_ADDR[31:0]
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- OTP_58[15:0] = MAC_ADDR[47:32]
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To program a MAC address on virgin OTP words above, you can use the fuse command
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on bank 0 to access to internal OTP:
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example to set mac address "12:34:56:78:9a:bc"
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1- Write OTP
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STM32MP> fuse prog -y 0 57 0x78563412 0x0000bc9a
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2- Read OTP
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STM32MP> fuse sense 0 57 2
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Sensing bank 0:
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Word 0x00000039: 78563412 0000bc9a
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3- next REBOOT :
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### Setting environment from OTP MAC address = "12:34:56:78:9a:bc"
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4 check env update
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STM32MP> print ethaddr
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ethaddr=12:34:56:78:9a:bc
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