uboot-tools/10-devicetree.install

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#!/bin/bash
# set -x
COMMAND="$1"
KERNEL_VERSION="$2"
#BOOT_DIR_ABS="$3"
#KERNEL_IMAGE="$4"
# Setup a /boot/dtb -> /boot/dtb-$newest_kernel_version symlink so that
# u-boot can find the correct dtb to load.
#
# If invoked to 'add' a new kernel, find the newest based on `sort`ing
# the kernel versions dtb. If 'remove', then follow basically the same
# procedure but exclude the version currently being removed.
#
# The theory of operation here is that, while newer kernels may add new
# dtb nodes and fields, as upstreaming hw support for some particular
# device progresses, it should never make backward incompatible changes.
# So it should always be safe to use a newer dtb with an older kernel.
if [[ "$(uname -m)" == arm* || "$(uname -m)" == aarch64 ]]; then
list_dtb_versions() {
excluded_version="$1"
for dtbdir in /boot/dtb-*; do
dtbver=${dtbdir#*-}
if [ "$dtbver" != "$excluded_version" ]; then
echo $dtbver
fi
done
}
setup_dtb_link() {
ver=`list_dtb_versions $1 | sort -r --sort=version | head -1`
if [ -h /boot/dtb ]; then
rm -f /boot/dtb
fi
ln -s dtb-$ver /boot/dtb
}
ret=0
case "$COMMAND" in
add)
setup_dtb_link
ret=$?
;;
remove)
setup_dtb_link $KERNEL_VERSION
ret=$?
;;
esac
exit $ret
fi