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