board: st: add generic board for STM32MP1 family
Add first support for STM32MP157C-ED1 board with "Basic" boot chain
1/ Boot Rom: load SPL with STM32 image header in SYSRAM
2/ SPL: power up and initialize the DDR and load U-Boot image
from SDCARD in DDR
3/ U-Boot: search and load extlinux.conf in SDCARD
(DISTRO activated)
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/board/st/stm32mp1/README b/board/st/stm32mp1/README
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+#
+# Copyright (C) 2018 STMicroelectronics - All Rights Reserved
+#
+# SPDX-License-Identifier: GPL-2.0+ BSD-3-Clause
+#
+
+U-Boot on STMicroelectronics STM32MP1
+======================================
+
+1. Summary
+==========
+This is a quick instruction for setup stm32mp1 boards.
+
+2. Supported devices
+====================
+U-Boot supports one STMP32MP1 SoCs: STM32MP157
+
+The STM32MP157 is a Cortex-A MPU aimed at various applications.
+It features:
+- Dual core Cortex-A7 application core
+- 2D/3D image composition with GPU
+- 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)
+
+And the necessary drivers
+1. I2C
+2. STPMU1
+3. Clock, Reset
+
+Currently the following boards are supported:
++ stm32mp157c-ed1
+
+3. Boot Sequences
+=================
+
+BootRom => FSBL in SYSRAM => SSBL in DDR => OS (Linux Kernel)
+
+with FSBL = First Stage Bootloader
+ SSBL = Second Stage Bootloader
+
+One boot configuration is supported:
+
+ 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 STM32MP1 board 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:
+
++ ed1: daughter board with pmic stpmu1
+ dts: stm32mp157c-ed1
+
+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 STM32MP1, 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_basic
+
+4. Configure the U-Boot:
+
+ # make <defconfig_file>
+
+ - For basic boot mode: "stm32mp15_basic_defconfig"
+
+5. Configure the device-tree and build the U-Boot image:
+
+ # make DEVICE_TREE=<name> all
+
+
+ example:
+ basic boot on ed1
+ # export KBUILD_OUTPUT=stm32mp15_basic
+ # make stm32mp15_basic_defconfig
+ # make DEVICE_TREE=stm32mp157c-ed1 all
+
+6. Output files
+
+ BootRom and ATF 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:
+
+ + FSBL = spl/u-boot-spl.stm32
+ + SSBL = u-boot.img
+
+6. 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 | ATF or SPL |
+ | 2 | fsbl2 | 256 KiB | ATF 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 partition for kernel (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
+
+7. Switch Setting
+==================
+
+You can select the boot mode, on the board ed1 with the switch SW1
+
+ -----------------------------------
+ Boot Mode BOOT2 BOOT1 BOOT0
+ -----------------------------------
+ Reserved 0 0 0
+ NOR 0 0 1
+ SD-Card 1 1 1
+ SD-Card 1 0 1
+ eMMC 0 1 0
+ NAND 0 1 1
+ Recovery 1 1 0
+ Recovery 0 0 0
+
+
+To boot from SDCard, select BootPinMode = 1 1 1 and reset.
+
+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)