Last active
January 5, 2023 19:54
-
-
Save Informatic/10f0832d8971c4d874210dc984462e5b to your computer and use it in GitHub Desktop.
Example FIT image descriptor with signatures & buildroot post-image hook / https://blog.inf.re/buildroot-cheatsheet.html
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/dts-v1/; | |
/ { | |
description = "Example FIT image"; | |
#address-cells = <1>; | |
images { | |
kernel@1 { | |
description = "default kernel"; | |
data = /incbin/("./zImage"); | |
type = "kernel"; | |
arch = "arm"; | |
os = "linux"; | |
compression = "none"; | |
load = <0x42000000>; | |
entry = <0x42000000>; | |
hash@1 { | |
algo = "sha1"; | |
}; | |
}; | |
ramdisk@1 { | |
description = "rootfs"; | |
data = /incbin/("./rootfs.cpio.gz"); | |
type = "ramdisk"; | |
arch = "arm"; | |
os = "linux"; | |
compression = "gzip"; | |
load = <00000000>; | |
entry = <00000000>; | |
hash@1 { | |
algo = "sha1"; | |
}; | |
}; | |
fdt@1 { | |
description = "device tree"; | |
data = /incbin/("./sun8i-h2-plus-orangepi-zero.dtb"); | |
type = "flat_dt"; | |
arch = "arm"; | |
compression = "none"; | |
hash@1 { | |
algo = "sha1"; | |
}; | |
}; | |
}; | |
configurations { | |
default = "config@1"; | |
config@1 { | |
description = "default configuration"; | |
kernel = "kernel@1"; | |
ramdisk = "ramdisk@1"; | |
fdt = "fdt@1"; | |
signature@1 { | |
algo = "sha1,rsa2048"; | |
key-name-hint = "dev"; | |
sign-images = "fdt", "kernel", "ramdisk"; | |
}; | |
}; | |
}; | |
}; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/bin/sh | |
# post-image-signatures.sh - build full .itb image with signatures | |
set -e | |
BOARD_DIR="$( dirname "${0}" )" | |
KEYS_DIR="${BOARD_DIR}/../../keys" | |
MKIMAGE="${HOST_DIR}/bin/mkimage" | |
IMAGE_ITS="image.its" | |
OUTPUT_NAME="image.itb" | |
# We have to copy .its file over to images/ for /incbin/ to work | |
cp "${BOARD_DIR}/${IMAGE_ITS}" "${BINARIES_DIR}" | |
cd "${BINARIES_DIR}" | |
echo " -> Building..." | |
"${MKIMAGE}" -D "-I dts -O dtb -p 2000" -f ${IMAGE_ITS} ${OUTPUT_NAME} | |
echo " -> Signing..." | |
"${MKIMAGE}" -D "-I dts -O dtb -p 2000" -F -k "${KEYS_DIR}" -K "${BUILD_DIR}/uboot-2017.03/dts/dt.dtb" -r ${OUTPUT_NAME} | |
rm ${IMAGE_ITS} | |
# Rebuild uboot with patched dtb | |
cd "${BUILD_DIR}/.." | |
make uboot-rebuild |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment