add rpi5 custom example

board/raspberrypi5_custom/cmdline.txt

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+root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyAMA0,115200

board/raspberrypi5_custom/config.txt

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+# See http://buildroot.org/manual.html#rootfs-custom
+# and http://elinux.org/RPiconfig for a description of config.txt syntax
+
+kernel=Image
+
+# To use an external initramfs file
+#initramfs rootfs.cpio.gz
+
+# Disable HDMI to reduce noise
+hdmi_ignore_hotplug=1
+hdmi_blanking=2
+disable_splash=1
+
+# gpu mem config (seems to be totally nececcarry - smaller than 32m does not boot on rpi3)
+gpu_mem=32
+
+# uart debug enable on GPIO14/15
+enable_uart=1
+uart_2ndstage=1
+dtparam=uart0_console
+dtdebug=1
+
+dtoverlay=disable-bt
+dtoverlay=disable-wifi
+dtoverlay=uart1-pi5
+dtoverlay=uart2-pi5

board/raspberrypi5_custom/genimage.cfg.in

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+image boot.vfat {
+	vfat {
+		files = {
+#BOOT_FILES#
+		}
+	}
+
+	size = 32M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

board/raspberrypi5_custom/linux-4k-page-size.fragment

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+CONFIG_ARM64_4K_PAGES=y

board/raspberrypi5_custom/patches/linux-headers/linux-headers.hash

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+../linux/linux.hash

board/raspberrypi5_custom/patches/linux/linux.hash

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+# Locally calculated
+sha256  dab3052783c68c46a5bc645b1c38d9705da995ab42823566518b62eb1fa1ef97  linux-576cc10e1ed50a9eacffc7a05c796051d7343ea4.tar.gz

board/raspberrypi5_custom/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
+# systemd doesn't use /etc/inittab, enable getty.tty1.service instead
+elif [ -d ${TARGET_DIR}/etc/systemd ]; then
+    mkdir -p "${TARGET_DIR}/etc/systemd/system/getty.target.wants"
+    ln -sf /lib/systemd/system/getty@.service \
+       "${TARGET_DIR}/etc/systemd/system/getty.target.wants/getty@tty1.service"
+fi

board/raspberrypi5_custom/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"
+
+# generate genimage from template if a board specific variant doesn't exists
+if [ ! -e "${GENIMAGE_CFG}" ]; then
+	GENIMAGE_CFG="${BINARIES_DIR}/genimage.cfg"
+	FILES=()
+
+	for i in "${BINARIES_DIR}"/*.dtb "${BINARIES_DIR}"/rpi-firmware/*; do
+		FILES+=( "${i#${BINARIES_DIR}/}" )
+	done
+
+	KERNEL=$(sed -n 's/^kernel=//p' "${BINARIES_DIR}/rpi-firmware/config.txt")
+	FILES+=( "${KERNEL}" )
+
+	BOOT_FILES=$(printf '\\t\\t\\t"%s",\\n' "${FILES[@]}")
+	sed "s|#BOOT_FILES#|${BOOT_FILES}|" "${BOARD_DIR}/genimage.cfg.in" \
+		> "${GENIMAGE_CFG}"
+fi
+
+# 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 $?

board/raspberrypi5_custom/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).
+  - the model CM4 (aka Raspberry Pi Compute Module 4 and IO Board).
+  - the model B5 (aka Raspberry Pi 5).
+
+How to build it
+===============
+
+Configure Buildroot
+-------------------
+
+There are several Raspberry Pi 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
+
+or for model Zero W (model Zero with wireless LAN and Bluetooth):
+
+  $ make raspberrypi0w_defconfig
+
+For model Zero 2 W (model B3 in smaller form factor):
+
+  $ make raspberrypizero2w_defconfig
+
+For model 2 B:
+
+  $ make raspberrypi2_defconfig
+
+For model 3 B and B+:
+
+  $ make raspberrypi3_defconfig
+
+or for model 3 B and B+ (64 bit):
+
+  $ make raspberrypi3_64_defconfig
+
+For model 4 B:
+
+  $ make raspberrypi4_defconfig
+
+or for model 4 B (64 bit):
+
+  $ make raspberrypi4_64_defconfig
+
+For model CM4 (on IO Board):
+
+  $ make raspberrypicm4io_defconfig
+
+or for CM4 (on IO Board - 64 bit):
+
+  $ make raspberrypicm4io_64_defconfig
+
+For model 5 B:
+
+  $ make raspberrypi5_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-rev1.dtb      [1]
+    +-- bcm2708-rpi-b.dtb           [1]
+    +-- bcm2708-rpi-b-plus.dtb      [1]
+    +-- bcm2708-rpi-cm.dtb          [1]
+    +-- bcm2708-rpi-zero.dtb        [1]
+    +-- bcm2708-rpi-zero-w.dtb      [1]
+    +-- bcm2710-rpi-zero-2-w.dtb    [1]
+    +-- bcm2709-rpi-2-b.dtb         [1]
+    +-- bcm2710-rpi-2-b.dtb         [1]
+    +-- bcm2710-rpi-3-b.dtb         [1]
+    +-- bcm2710-rpi-3-b-plus.dtb    [1]
+    +-- bcm2710-rpi-cm3.dtb         [1]
+    +-- bcm2711-rpi-4-b.dtb         [1]
+    +-- bcm2711-rpi-400.dtb         [1]
+    +-- bcm2711-rpi-cm4.dtb         [1]
+    +-- bcm2711-rpi-cm4s.dtb        [1]
+    +-- bcm2712-rpi-5-b.dtb         [1]
+    +-- bcm2712d0-rpi-5-b.dtb       [1]
+    +-- boot.vfat
+    +-- rootfs.ext4
+    +-- rpi-firmware/
+    |   +-- bootcode.bin
+    |   +-- cmdline.txt
+    |   +-- config.txt
+    |   +-- fixup.dat               [1]
+    |   +-- fixup4.dat              [1]
+    |   +-- start.elf               [1]
+    |   +-- start4.elf              [1]
+    |   `-- overlays/               [2]
+    +-- sdcard.img
+    +-- Image                       [1]
+    `-- zImage                      [1]
+
+[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.
+
+How to write to CM4 eMMC memory
+===============================
+
+For CM4 modules without eMMC memory see above for booting from SD card,
+for CM4 modules with eMMC memory proceed as following:
+
+- fit jumper on IO Board header J2 to disable eMMC boot
+- connect IO Board micro USB port (J11 USB slave) to your host linux system
+- power up CM4/IO Board (lsusb command should show a '0a5c:2711 Broadcom Corp.
+  BCM2711 Boot' device)
+- run 'sudo ./host/bin/rpiboot', output should look like the following:
+    Waiting for BCM2835/6/7/2711...
+    Loading embedded: bootcode4.bin
+    Sending bootcode.bin
+    Successful read 4 bytes
+    Waiting for BCM2835/6/7/2711...
+    Loading embedded: bootcode4.bin
+    Second stage boot server
+    Loading embedded: start4.elf
+    File read: start4.elf
+    Second stage boot server done
+
+- a USB mass storage device should show up (the CM4 eMMC memory), proceed
+  as described above to copy sdcard.img to it
+- power down CM4/IO Board
+- remove jumper on IO Board header J2 to re-enable eMMC boot
+- power up CM4/IO Board

configs/raspberrypi5_custom_defconfig

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+BR2_aarch64=y
+BR2_cortex_a76=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_6=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_GLOBAL_PATCH_DIR="$(BR2_EXTERNAL_AURACASTER_SYSTEM_PATH)/board/raspberrypi5_custom/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_TARGET_GENERIC_ROOT_PASSWD="123"
+BR2_TARGET_GENERIC_GETTY_PORT="ttyAMA0"
+BR2_TARGET_GENERIC_GETTY_BAUDRATE_115200=y
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_POST_BUILD_SCRIPT="$(BR2_EXTERNAL_AURACASTER_SYSTEM_PATH)/board/raspberrypi5_custom/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="$(BR2_EXTERNAL_AURACASTER_SYSTEM_PATH)/board/raspberrypi5_custom/post-image.sh"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,raspberrypi,linux,576cc10e1ed50a9eacffc7a05c796051d7343ea4)/linux-576cc10e1ed50a9eacffc7a05c796051d7343ea4.tar.gz"
+BR2_LINUX_KERNEL_DEFCONFIG="bcm2712"
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="$(BR2_EXTERNAL_AURACASTER_SYSTEM_PATH)/board/raspberrypi5_custom/linux-4k-page-size.fragment"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2712-rpi-5-b broadcom/bcm2712d0-rpi-5-b"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+BR2_PACKAGE_XZ=y
+BR2_PACKAGE_RPI_FIRMWARE=y
+BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE="$(BR2_EXTERNAL_AURACASTER_SYSTEM_PATH)/board/raspberrypi5_custom/config.txt"
+BR2_PACKAGE_RPI_FIRMWARE_CMDLINE_FILE="$(BR2_EXTERNAL_AURACASTER_SYSTEM_PATH)/board/raspberrypi5_custom/cmdline.txt"
+# BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTB_OVERLAYS is not set
+BR2_PACKAGE_DROPBEAR=y
+BR2_PACKAGE_KMOD=y
+BR2_PACKAGE_KMOD_TOOLS=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
+# BR2_TARGET_ROOTFS_TAR is not set
+BR2_PACKAGE_HOST_DOSFSTOOLS=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_KMOD_XZ=y
+BR2_PACKAGE_HOST_MTOOLS=y