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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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# Copyright (C) 2015 Frank Rowand#
usage() {
# use spaces instead of tabs in the usage message cat >&2 <<eod
Usage:
`basename $0` DTx decompile DTx
`basename $0` DTx_1 DTx_2 diff DTx_1 and DTx_2
--annotate synonym for -T --color synonym for -c (requires diff with --color support) -c enable colored output -f print full dts in diff (--unified=99999) -h synonym for --help -help synonym for --help --help print this message and exit -s SRCTREE linux kernel source tree is at path SRCTREE (default is current directory) -S linux kernel source tree is at root of current git repo -T annotate output .dts with input source file and line (-T -T for more details) -u unsorted, do not sort DTx
Each DTx is processed by the dtc compiler to produce a sorted dts sourcefile. If DTx is a dts source file then it is pre-processed in the samemanner as done for the compile of the dts source file in the Linux kernelbuild system ('#include' and '/include/' directives are processed).
If two DTx are provided, the resulting dts source files are diffed.
If DTx is a directory, it is treated as a DT subtree, such as /proc/device-tree.
If DTx contains the binary blob magic value in the first four bytes, it is treated as a binary blob (aka .dtb or FDT).
Otherwise DTx is treated as a dts source file (aka .dts).
If this script is not run from the root of the linux source tree, and DTx utilizes '#include' or '/include/' then the path of the linux source tree can be provided by '-s SRCTREE' or '-S' so that include paths will be set properly.
The shell variable \${ARCH} must provide the architecture containing the dts source file for include paths to be set properly for '#include' or '/include/' to be processed.
If DTx_1 and DTx_2 are in different architectures, then this script may not work since \${ARCH} is part of the include path. The following workaround can be used:
`basename $0` ARCH=arch_of_dtx_1 DTx_1 >tmp_dtx_1.dts `basename $0` ARCH=arch_of_dtx_2 DTx_2 >tmp_dtx_2.dts `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts rm tmp_dtx_1.dts tmp_dtx_2.dts
If DTx_1 and DTx_2 are in different directories, then this script will add the path of DTx_1 and DTx_2 to the include paths. If DTx_2 includes a local file that exists in both the path of DTx_1 and DTx_2 then the file in the path of DTx_1 will incorrectly be included. Possible workaround:
`basename $0` DTx_1 >tmp_dtx_1.dts `basename $0` DTx_2 >tmp_dtx_2.dts `basename $0` tmp_dtx_1.dts tmp_dtx_2.dts rm tmp_dtx_1.dts tmp_dtx_2.dts
eod}
compile_to_dts() {
dtx="$1" dtc_include="$2"
if [ -d "${dtx}" ] ; then
# ----- input is file tree
if ( ! ${DTC} -I fs ${dtx} ) ; then exit 3 fi
elif [ -f "${dtx}" ] && [ -r "${dtx}" ] ; then
magic=`hexdump -n 4 -e '/1 "%02x"' ${dtx}` if [ "${magic}" = "d00dfeed" ] ; then
# ----- input is FDT (binary blob)
if ( ! ${DTC} -I dtb ${dtx} ) ; then exit 3 fi
return
fi
# ----- input is DTS (source)
if ( cpp ${cpp_flags} -x assembler-with-cpp ${dtx} \ | ${DTC} ${dtc_include} -I dts ) ; then return fi
echo "" >&2 echo "Possible hints to resolve the above error:" >&2 echo " (hints might not fix the problem)" >&2
hint_given=0
if [ "${ARCH}" = "" ] ; then hint_given=1 echo "" >&2 echo " shell variable \$ARCH not set" >&2 fi
dtx_arch=`echo "/${dtx}" | sed -e 's|.*/arch/||' -e 's|/.*||'`
if [ "${dtx_arch}" != "" -a "${dtx_arch}" != "${ARCH}" ] ; then hint_given=1 echo "" >&2 echo " architecture ${dtx_arch} is in file path," >&2 echo " but does not match shell variable \$ARCH" >&2 echo " >>\$ARCH<< is: >>${ARCH}<<" >&2 fi
if [ ! -d ${srctree}/arch/${ARCH} ] ; then hint_given=1 echo "" >&2 echo " ${srctree}/arch/${ARCH}/ does not exist" >&2 echo " Is \$ARCH='${ARCH}' correct?" >&2 echo " Possible fix: use '-s' option" >&2
git_root=`git rev-parse --show-toplevel 2>/dev/null` if [ -d ${git_root}/arch/ ] ; then echo " Possible fix: use '-S' option" >&2 fi fi
if [ $hint_given = 0 ] ; then echo "" >&2 echo " No hints available." >&2 fi
echo "" >&2
exit 3
else echo "" >&2 echo "ERROR: ${dtx} does not exist or is not readable" >&2 echo "" >&2 exit 2 fi
}
# ----- start of script
annotate=""cmd_diff=0diff_flags="-u"diff_color=""dtx_file_1=""dtx_file_2=""dtc_sort="-s"help=0srctree=""
while [ $# -gt 0 ] ; do
case $1 in
-c | --color ) if diff --color /dev/null /dev/null 2>/dev/null ; then diff_color="--color=always" fi shift ;;
-f ) diff_flags="--unified=999999" shift ;;
-h | -help | --help ) help=1 shift ;;
-s ) srctree="$2" shift 2 ;;
-S ) git_root=`git rev-parse --show-toplevel 2>/dev/null` srctree="${git_root}" shift ;;
-T | --annotate ) if [ "${annotate}" = "" ] ; then annotate="-T" elif [ "${annotate}" = "-T" ] ; then annotate="-T -T" fi shift ;; -u ) dtc_sort="" shift ;;
*) if [ "${dtx_file_1}" = "" ] ; then dtx_file_1="$1" elif [ "${dtx_file_2}" = "" ] ; then dtx_file_2="$1" else echo "" >&2 echo "ERROR: Unexpected parameter: $1" >&2 echo "" >&2 exit 2 fi shift ;;
esac
done
if [ "${srctree}" = "" ] ; then srctree="."fi
if [ "${dtx_file_2}" != "" ]; then cmd_diff=1fi
if (( ${help} )) ; then usage exit 1fi
# this must follow check for ${help}if [ "${dtx_file_1}" = "" ]; then echo "" >&2 echo "ERROR: parameter DTx required" >&2 echo "" >&2 exit 2fi
# ----- prefer dtc from linux kernel, allow fallback to dtc in $PATH
if [ "${KBUILD_OUTPUT:0:2}" = ".." ] ; then __KBUILD_OUTPUT="${srctree}/${KBUILD_OUTPUT}"elif [ "${KBUILD_OUTPUT}" = "" ] ; then __KBUILD_OUTPUT="."else __KBUILD_OUTPUT="${KBUILD_OUTPUT}"fi
DTC="${__KBUILD_OUTPUT}/scripts/dtc/dtc"
if [ ! -x ${DTC} ] ; then __DTC="dtc" if grep -q "^CONFIG_DTC=y" ${__KBUILD_OUTPUT}/.config 2>/dev/null; then make_command=' make scripts' else make_command=' Enable CONFIG_DTC in the kernel configuration make scripts' fi if ( ! which ${__DTC} >/dev/null ) ; then
# use spaces instead of tabs in the error message cat >&2 <<eod
ERROR: unable to find a 'dtc' program
Preferred 'dtc' (built from Linux kernel source tree) was not found or is not executable.
'dtc' is: ${DTC}
If it does not exist, create it from the root of the Linux source tree:${make_command}
If not at the root of the Linux kernel source tree -s SRCTREE or -S may need to be specified to find 'dtc'.
If 'O=\${dir}' is specified in your Linux builds, this script requires 'export KBUILD_OUTPUT=\${dir}' or add \${dir}/scripts/dtc to \$PATH before running.
If \${KBUILD_OUTPUT} is a relative path, then '-s SRCDIR', -S, or run this script from the root of the Linux kernel source tree is required.
Fallback '${__DTC}' was also not in \${PATH} or is not executable.
eod exit 2 fi DTC=${__DTC}fi
# ----- cpp and dtc flags same as for linux source tree build of .dtb files,# plus directories of the dtx file(s)
dtx_path_1_dtc_include="-i `dirname ${dtx_file_1}`"
dtx_path_2_dtc_include=""if (( ${cmd_diff} )) ; then dtx_path_2_dtc_include="-i `dirname ${dtx_file_2}`"fi
cpp_flags="\ -nostdinc \ -I${srctree}/scripts/dtc/include-prefixes \ -undef -D__DTS__"
DTC="\ ${DTC} \ -i ${srctree}/scripts/dtc/include-prefixes \ -O dts -qq -f ${dtc_sort} ${annotate} -o -"
# ----- do the diff or decompile
if (( ${cmd_diff} )) ; then
diff ${diff_flags} ${diff_color} --label "${dtx_file_1}" --label "${dtx_file_2}" \ <(compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}") \ <(compile_to_dts "${dtx_file_2}" "${dtx_path_2_dtc_include}")
else
compile_to_dts "${dtx_file_1}" "${dtx_path_1_dtc_include}"
fi