Added configuration for RaspberryPi 4B

external_tree/board/iminc/raspberrypi-4b-system-agent/genimage-raspberrypi-4b-system-agent.cfg

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+image boot.vfat {
+  vfat {
+    files = {
+      "bcm2711-rpi-4-b.dtb",
+      "rpi-firmware/cmdline.txt",
+      "rpi-firmware/config.txt",
+      "rpi-firmware/fixup.dat",
+      "rpi-firmware/start.elf",
+      "rpi-firmware/overlays",
+      "Image"
+    }
+  }
+  size = 32M
+}
+
+image sdcard.img {
+  hdimage {
+  }
+
+  partition boot {
+    partition-type = 0xC
+    bootable = "true"
+    image = "boot.vfat"
+  }
+
+  partition rootfs {
+    partition-type = 0x83
+    image = "rootfs.ext4"
+  }
+}

external_tree/board/iminc/raspberrypi-4b-system-agent/post-build.sh

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+#!/bin/sh
+
+set -u
+set -e
+
+# Add a console on tty1
+if [ -e ${TARGET_DIR}/etc/inittab ]; then
+    grep -qE '^tty1::' ${TARGET_DIR}/etc/inittab || \
+	sed -i '/GENERIC_SERIAL/a\
+tty1::respawn:/sbin/getty -L  tty1 0 vt100 # HDMI console' ${TARGET_DIR}/etc/inittab
+fi

external_tree/board/iminc/raspberrypi-4b-system-agent/post-image.sh

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+#!/bin/bash
+
+set -e
+
+BOARD_DIR="$(dirname $0)"
+BOARD_NAME="$(basename ${BOARD_DIR})"
+GENIMAGE_CFG="${BOARD_DIR}/genimage-${BOARD_NAME}.cfg"
+GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"
+
+for arg in "$@"
+do
+	case "${arg}" in
+		--add-miniuart-bt-overlay)
+		if ! grep -qE '^dtoverlay=' "${BINARIES_DIR}/rpi-firmware/config.txt"; then
+			echo "Adding 'dtoverlay=miniuart-bt' to config.txt (fixes ttyAMA0 serial console)."
+			cat << __EOF__ >> "${BINARIES_DIR}/rpi-firmware/config.txt"
+
+# fixes rpi (3B, 3B+, 3A+, 4B and Zero W) ttyAMA0 serial console
+dtoverlay=miniuart-bt
+__EOF__
+		fi
+		;;
+		--aarch64)
+		# Run a 64bits kernel (armv8)
+		sed -e '/^kernel=/s,=.*,=Image,' -i "${BINARIES_DIR}/rpi-firmware/config.txt"
+		if ! grep -qE '^arm_64bit=1' "${BINARIES_DIR}/rpi-firmware/config.txt"; then
+			cat << __EOF__ >> "${BINARIES_DIR}/rpi-firmware/config.txt"
+
+# enable 64bits support
+arm_64bit=1
+__EOF__
+		fi
+		;;
+		--gpu_mem_256=*|--gpu_mem_512=*|--gpu_mem_1024=*)
+		# Set GPU memory
+		gpu_mem="${arg:2}"
+		sed -e "/^${gpu_mem%=*}=/s,=.*,=${gpu_mem##*=}," -i "${BINARIES_DIR}/rpi-firmware/config.txt"
+		;;
+	esac
+
+done
+
+# Pass an empty rootpath. genimage makes a full copy of the given rootpath to
+# ${GENIMAGE_TMP}/root so passing TARGET_DIR would be a waste of time and disk
+# space. We don't rely on genimage to build the rootfs image, just to insert a
+# pre-built one in the disk image.
+
+trap 'rm -rf "${ROOTPATH_TMP}"' EXIT
+ROOTPATH_TMP="$(mktemp -d)"
+
+rm -rf "${GENIMAGE_TMP}"
+
+genimage \
+	--rootpath "${ROOTPATH_TMP}"   \
+	--tmppath "${GENIMAGE_TMP}"    \
+	--inputpath "${BINARIES_DIR}"  \
+	--outputpath "${BINARIES_DIR}" \
+	--config "${GENIMAGE_CFG}"
+
+exit $?

external_tree/board/iminc/raspberrypi-4b-system-agent/readme.txt

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+Raspberry Pi
+
+Intro
+=====
+
+These instructions apply to all models of the Raspberry Pi:
+  - the original models A and B,
+  - the "enhanced" models A+ and B+,
+  - the model B2 (aka Raspberry Pi 2)
+  - the model B3 (aka Raspberry Pi 3).
+  - the model B4 (aka Raspberry Pi 4).
+
+How to build it
+===============
+
+Configure Buildroot
+-------------------
+
+There are two RaspberryPi defconfig files in Buildroot, one for each
+major variant, which you should base your work on:
+
+For models A, B, A+ or B+:
+
+  $ make raspberrypi_defconfig
+
+For model Zero (model A+ in smaller form factor):
+
+  $ make raspberrypi0_defconfig
+
+For model 2 B:
+
+  $ make raspberrypi2_defconfig
+
+For model 3 B and B+:
+
+  $ make raspberrypi3_defconfig
+
+For model 4 B:
+
+  $ make raspberrypi4_defconfig
+
+Build the rootfs
+----------------
+
+Note: you will need to have access to the network, since Buildroot will
+download the packages' sources.
+
+You may now build your rootfs with:
+
+  $ make
+
+(This may take a while, consider getting yourself a coffee ;-) )
+
+Result of the build
+-------------------
+
+After building, you should obtain this tree:
+
+    output/images/
+    +-- bcm2708-rpi-b.dtb           [1]
+    +-- bcm2708-rpi-b-plus.dtb      [1]
+    +-- bcm2709-rpi-2-b.dtb         [1]
+    +-- bcm2710-rpi-3-b.dtb         [1]
+    +-- bcm2710-rpi-3-b-plus.dtb    [1]
+    +-- bcm2711-rpi-4-b.dtb         [1]
+    +-- boot.vfat
+    +-- rootfs.ext4
+    +-- rpi-firmware/
+    |   +-- bootcode.bin
+    |   +-- cmdline.txt
+    |   +-- config.txt
+    |   +-- fixup.dat
+    |   +-- start.elf
+    |   `-- overlays/               [2]
+    +-- sdcard.img
+    `-- zImage
+
+[1] Not all of them will be present, depending on the RaspberryPi
+    model you are using.
+
+[2] Only for the Raspberry Pi 3/4 Models (overlay miniuart-bt is needed
+    to enable the RPi3 serial console otherwise occupied by the bluetooth
+    chip). Alternative would be to disable the serial console in cmdline.txt
+    and /etc/inittab.
+
+How to write the SD card
+========================
+
+Once the build process is finished you will have an image called "sdcard.img"
+in the output/images/ directory.
+
+Copy the bootable "sdcard.img" onto an SD card with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+
+Insert the SDcard into your Raspberry Pi, and power it up. Your new system
+should come up now and start two consoles: one on the serial port on
+the P1 header, one on the HDMI output where you can login using a USB
+keyboard.

external_tree/configs/system_agent_raspberrypi_4b_defconfig

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+BR2_aarch64=y
+BR2_cortex_a72=y
+BR2_TOOLCHAIN_BUILDROOT_GLIBC=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
+BR2_PACKAGE_GLIBC_UTILS=y
+BR2_BINUTILS_VERSION_2_36_X=y
+BR2_GCC_VERSION_10_X=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_GCC_ENABLE_LTO=y
+BR2_PACKAGE_HOST_GDB=y
+BR2_PACKAGE_HOST_GDB_TUI=y
+BR2_PACKAGE_HOST_GDB_PYTHON3=y
+BR2_GDB_VERSION_10=y
+BR2_TARGET_GENERIC_HOSTNAME="system-agent-raspberrypi-4b"
+BR2_TARGET_GENERIC_ISSUE="ARE U OKAY ?"
+BR2_INIT_SYSTEMD=y
+# BR2_TARGET_ENABLE_ROOT_LOGIN is not set
+BR2_SYSTEM_BIN_SH_BASH=y
+BR2_SYSTEM_DEFAULT_PATH="/bin:/sbin:/usr/bin:/usr/sbin"
+BR2_GENERATE_LOCALE="en_US.UTF-8"
+BR2_TARGET_LOCALTIME="Asia/Tokyo"
+BR2_ROOTFS_USERS_TABLES="$(BR2_EXTERNAL_system_agent_PATH)/customizations/users.table"
+BR2_ROOTFS_OVERLAY="$(BR2_EXTERNAL_system_agent_PATH)/customizations/overlay"
+BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_system_agent_PATH)/board/iminc/raspberrypi-4b-system-agent/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_system_agent_PATH)/board/iminc/raspberrypi-4b-system-agent/post-image.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="--add-miniuart-bt-overlay --aarch64"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspberrypi,linux,081f560bde7188ca6f40cf297bd55c680e0179c0)/linux-081f560bde7188ca6f40cf297bd55c680e0179c0.tar.gz"
+BR2_LINUX_KERNEL_DEFCONFIG="bcm2711"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_system_agent_PATH)/board/iminc/raspberrypi-4b-system-agent/linux.fragment"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2711-rpi-4-b"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_PACKAGE_LINUX_TOOLS_CPUPOWER=y
+BR2_PACKAGE_LINUX_TOOLS_GPIO=y
+BR2_PACKAGE_LINUX_TOOLS_IIO=y
+BR2_PACKAGE_E2FSPROGS=y
+BR2_PACKAGE_E2FSPROGS_E4DEFRAG=y
+BR2_PACKAGE_E2FSPROGS_RESIZE2FS=y
+BR2_PACKAGE_RPI_FIRMWARE=y
+BR2_PACKAGE_RPI_FIRMWARE_VARIANT_PI4=y
+BR2_PACKAGE_GPTFDISK=y
+BR2_PACKAGE_GPTFDISK_GDISK=y
+BR2_PACKAGE_GPTFDISK_SGDISK=y
+BR2_PACKAGE_I2C_TOOLS=y
+BR2_PACKAGE_SPI_TOOLS=y
+BR2_PACKAGE_UBOOT_TOOLS=y
+BR2_PACKAGE_UBOOT_TOOLS_FIT_SUPPORT=y
+BR2_PACKAGE_UBOOT_TOOLS_MKIMAGE=y
+BR2_PACKAGE_UBOOT_TOOLS_MKENVIMAGE=y
+BR2_PACKAGE_UBOOT_TOOLS_DUMPIMAGE=y
+BR2_PACKAGE_LIBOPENSSL_BIN=y
+BR2_PACKAGE_LIBOPENSSL_ENGINES=y
+BR2_PACKAGE_LIBGPIOD=y
+BR2_PACKAGE_LIBGPIOD_TOOLS=y
+BR2_PACKAGE_LIBIIO=y
+# BR2_PACKAGE_LIBIIO_IIOD is not set
+BR2_PACKAGE_LIBIIO_TESTS=y
+BR2_PACKAGE_LIBCURL=y
+BR2_PACKAGE_LIBCURL_CURL=y
+BR2_PACKAGE_NETWORK_MANAGER=y
+BR2_PACKAGE_NETWORK_MANAGER_TUI=y
+BR2_PACKAGE_NETWORK_MANAGER_MODEM_MANAGER=y
+BR2_PACKAGE_OPENSSH=y
+BR2_PACKAGE_BASH_COMPLETION=y
+BR2_PACKAGE_FILE=y
+BR2_PACKAGE_SUDO=y
+BR2_PACKAGE_COREUTILS=y
+BR2_PACKAGE_HTOP=y
+BR2_PACKAGE_UTIL_LINUX_HWCLOCK=y
+BR2_PACKAGE_VIM=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="128M"
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_MTOOLS=y