initial buildroot for linux 5.15

board/hardkernel/odroidc2/boot.cmd

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+setenv kernel_filename "Image"
+setenv fdt_filename "meson-gxbb-odroidc2.dtb"
+setenv bootargs "console=ttyAML0,115200n8 earlyprintk root=/dev/mmcblk1p2 rootwait rw"
+
+echo > Loading Kernel...
+fatload mmc 0:1 ${kernel_addr_r} ${kernel_filename}
+echo > Loading FDT...
+fatload mmc 0:1 ${fdt_addr_r} ${fdt_filename}
+
+echo > Booting System...
+booti ${kernel_addr_r} - ${fdt_addr_r}

board/hardkernel/odroidc2/genimage.cfg

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+image boot.vfat {
+	vfat {
+		files = {
+			"Image",
+			"meson-gxbb-odroidc2.dtb",
+			"boot.scr"
+		}
+	}
+
+	size = 64M
+}
+
+image sdcard.img {
+	hdimage {
+	}
+
+	partition bl1 {
+		in-partition-table = "no"
+		image = "bl1.bin.hardkernel"
+		offset = 0
+	}
+
+	partition u-boot {
+		in-partition-table = "no"
+		image = "uboot-odc2.img"
+		offset = 49664 # 48KB + 512B
+	}
+
+	partition boot {
+		partition-type = 0xC
+		bootable = "true"
+		image = "boot.vfat"
+	}
+
+	partition rootfs {
+		partition-type = 0x83
+		image = "rootfs.ext4"
+	}
+}

board/hardkernel/odroidc2/post-image.sh

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+#!/bin/sh
+
+BOARD_DIR="$(dirname $0)"
+
+${HOST_DIR}/bin/fip_create \
+	--bl30 ${BINARIES_DIR}/bl30.bin \
+	--bl301 ${BINARIES_DIR}/bl301.bin \
+	--bl31 ${BINARIES_DIR}/bl31.bin \
+	--bl33 ${BINARIES_DIR}/u-boot.bin \
+	${BINARIES_DIR}/fip.bin
+
+${HOST_DIR}/bin/fip_create --dump ${BINARIES_DIR}/fip.bin
+
+cat ${BINARIES_DIR}/bl2.package ${BINARIES_DIR}/fip.bin \
+	> ${BINARIES_DIR}/boot_new.bin
+
+${HOST_DIR}/bin/amlbootsig ${BINARIES_DIR}/boot_new.bin ${BINARIES_DIR}/u-boot.img
+
+dd if=${BINARIES_DIR}/u-boot.img of=${BINARIES_DIR}/uboot-odc2.img bs=512 skip=96
+
+support/scripts/genimage.sh -c ${BOARD_DIR}/genimage.cfg

board/hardkernel/odroidc2/readme.txt

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+ODROID-C2
+
+Intro
+=====
+To be able to use ODROID-C2 board with the images generated by
+Buildroot, you have to prepare the SDCard or eMMC.
+
+How to build it
+===============
+
+  $ make odroidc2_defconfig
+
+Then you can edit the build options using
+
+  $ make menuconfig
+
+Compile all and build rootfs image:
+
+  $ make
+
+Note: you will need to have access to the network, since Buildroot will
+download the packages' sources.
+
+Result of the build
+-------------------
+
+After building, you should obtain this tree:
+
+    output/images/
+    +-- bl1.bin.hardkernel
+    +-- bl2.package
+    +-- bl301.bin
+    +-- bl30.bin
+    +-- bl31.bin
+    +-- boot_new.bin
+    +-- boot.scr                   [1]
+    +-- boot.vfat
+    +-- fip.bin
+    +-- Image                      [2]
+    +-- meson-gxbb-odroidc2.dtb
+    +-- rootfs.ext2
+    +-- rootfs.ext4
+    +-- rootfs.tar
+    +-- sdcard.img
+    +-- u-boot.bin
+    +-- u-boot.img
+    +-- uboot-odc2.img             [3]
+
+[1] This is the ODROID-C2 configuration file used in u-boot.
+[2] This is the ODROID-C2 kernel image file which will be booted.
+[3] This is the ODROID-C2 signed u-boot image which will be used.
+
+How to write the SD card or eMMC
+================================
+
+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 or eMMC with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+
+Insert the SDcard into your ODROID-C2, and power it up. Your new system
+should come up now.

board/hardkernel/odroidc2/rootfs_overlay/etc/init.d/S09modload

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+#!/bin/sh
+#
+
+load_drivers()
+{
+	echo "Loading needed modules..."
+	for file in $(echo "dwmac_generic dwmac-meson8b meson_dw_hdmi meson_gxbb_wdt"); do
+		modprobe ${file}
+	done
+}
+
+case "$1" in
+	start)
+		load_drivers
+		;;
+	stop)
+		;;
+	restart|reload)
+		;;
+	*)
+		echo "Usage: $0 {start|stop|restart}"
+		exit 1
+esac