configs/stm32h747_disco_sd: new defconfig

Support STM32h747i-disco board. It includes an STM32H747XI SoC with the
following resources:

 - 2 Mbytes Flash
 - 1 Mbyte SRAM
 - LCD-TFT controller
 - MIPI-DSI interface
 - FD-CAN
 - USB 2.0 high-speed/full-speed
 - Ethernet MAC
 - camera interface

Detailed information can be found at:
https://www.st.com/en/evaluation-tools/stm32h747i-disco.html

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

DEVELOPERS

@@ -800,12 +800,14 @@ N:	Dario Binacchi <dario.binacchi@amarulasolutions.com>
 F:	board/bsh/
 F:	board/stmicroelectronics/stm32f746-disco/
 F:	board/stmicroelectronics/stm32f769-disco/
+F:	board/stmicroelectronics/stm32h747-disco/
 F:	boot/ti-k3-boot-firmware/
 F:	configs/imx6ulz_bsh_smm_m2_defconfig
 F:	configs/imx8mn_bsh_smm_s2_defconfig
 F:	configs/imx8mn_bsh_smm_s2_pro_defconfig
 F:	configs/stm32f746_disco_sd_defconfig
 F:	configs/stm32f769_disco_sd_defconfig
+F:	configs/stm32h747_disco_sd_defconfig
 F:	package/aespipe/
 F:	package/armadillo/
 F:	package/atf/

board/stmicroelectronics/stm32h747-disco/extlinux.conf

@@ -0,0 +1,4 @@
+label stm32h747i-disco-buildroot
+  kernel /boot/zImage
+  devicetree /boot/stm32h747i-disco.dtb
+  append console=ttySTM0,115200 root=/dev/mmcblk0p1 rw rootfstype=ext2 rootwait earlyprintk consoleblank=0 ignore_loglevel

board/stmicroelectronics/stm32h747-disco/flash_sd.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+
+OUTPUT_DIR=$1
+
+if ! test -d "${OUTPUT_DIR}" ; then
+    echo "ERROR: no output directory specified."
+    echo "Usage: $0 OUTPUT_DIR"
+    exit 1
+fi
+
+"${OUTPUT_DIR}"/host/bin/openocd -f board/stm32h747i-disco.cfg \
+  -c "init" \
+  -c "reset init" \
+  -c "flash probe 0" \
+  -c "flash info 0" \
+  -c "flash write_image erase ${OUTPUT_DIR}/images/u-boot.bin 0x08000000" \
+  -c "reset run" \
+  -c "shutdown"

board/stmicroelectronics/stm32h747-disco/genimage.cfg

@@ -0,0 +1,10 @@
+image sdcard.img {
+	hdimage {
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext2"
+		size = 32M
+	}
+}

board/stmicroelectronics/stm32h747-disco/linux-sd.fragment

@@ -0,0 +1 @@
+# CONFIG_XIP_KERNEL is not set

board/stmicroelectronics/stm32h747-disco/patches/linux/linux.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  189d1f409cef8d0d234210e04595172df392f8cb297e14b447ed95720e2fd940  linux-6.18.5.tar.xz

board/stmicroelectronics/stm32h747-disco/patches/uboot/uboot.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  b60d5865cefdbc75da8da4156c56c458e00de75a49b80c1a2e58a96e30ad0d54  u-boot-2026.01.tar.bz2

board/stmicroelectronics/stm32h747-disco/post-build.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -eu
+
+BOARD_DIR="$(dirname "$0")"
+
+# Kernel is built without devpts support
+sed -i '/^devpts/d' "${TARGET_DIR}"/etc/fstab
+
+install -m 0644 -D "${BOARD_DIR}"/extlinux.conf "${TARGET_DIR}"/boot/extlinux/extlinux.conf

board/stmicroelectronics/stm32h747-disco/readme.txt

@@ -0,0 +1,32 @@
+STM32H747 Discovery
+===================
+
+This tutorial describes how to use the predefined Buildroot
+configuration for the STM32H747 Discovery evaluation platform.
+
+Building
+--------
+
+  make stm32h747_disco_sd_defconfig
+  make
+
+Flashing
+--------
+
+  ./board/stmicroelectronics/stm32h747-disco/flash_sd.sh output/
+
+It will flash the U-Boot bootloader.
+
+Creating SD card
+----------------
+
+Buildroot prepares an "sdcard.img" image in the output/images/ directory,
+ready to be dumped on a SD card. Launch the following command as root:
+
+  dd if=output/images/sdcard.img of=/dev/<your-sd-device>
+
+*** WARNING! This will destroy all the card content. Use with care! ***
+
+For details about the medium image layout and its content, see the
+definition in board/stmicroelectronics/stm32h747-disco/genimage.cfg.
+

configs/stm32h747_disco_sd_defconfig

@@ -0,0 +1,32 @@
+BR2_arm=y
+BR2_cortex_m7=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7M_UCLIBC_STABLE=y
+BR2_GLOBAL_PATCH_DIR="board/stmicroelectronics/stm32h747-disco/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/stmicroelectronics/stm32h747-disco/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/stmicroelectronics/stm32h747-disco/genimage.cfg"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.18.5"
+BR2_LINUX_KERNEL_DEFCONFIG="stm32"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(LINUX_DIR)/arch/arm/configs/dram_0xd0000000.config board/stmicroelectronics/stm32h747-disco/linux-sd.fragment"
+BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
+BR2_LINUX_KERNEL_IMAGE_TARGET_NAME="zImage"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="st/stm32h747i-disco"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_PACKAGE_EVTEST=y
+# BR2_PACKAGE_IFUPDOWN_SCRIPTS is not set
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="32M"
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2026.01"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="stm32h747-disco"
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_OPENOCD=y