mirror of
https://github.com/torvalds/linux.git
synced 2025-11-01 00:58:39 +02:00
dtc: create tool to diff device trees
Create script to diff device trees. The device tree can be in any of the forms recognized by the dtc compiler: - source - binary blob - file system tree (from /proc/devicetree) If the device tree is a source file, then it is pre-processed in the same way as it would be when built in the linux kernel source tree before diffing. Signed-off-by: Frank Rowand <frank.rowand@sonymobile.com> Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Frank Rowand
Rob Herring
parent
92e963f50f
commit
10eadc253d
1 changed files with 343 additions and 0 deletions
343
scripts/dtc/dtx_diff
Executable file
343
scripts/dtc/dtx_diff
Executable file
|
|
@ -0,0 +1,343 @@
|
||||||
|
#! /bin/bash
|
||||||
|
|
||||||
|
# Copyright (C) 2015 Frank Rowand
|
||||||
|
#
|
||||||
|
# This program is free software; you can redistribute it and/or modify
|
||||||
|
# it under the terms of the GNU General Public License as published by
|
||||||
|
# the Free Software Foundation; version 2 of the License.
|
||||||
|
|
||||||
|
|
||||||
|
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
|
||||||
|
|
||||||
|
|
||||||
|
-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
|
||||||
|
-u unsorted, do not sort DTx
|
||||||
|
|
||||||
|
|
||||||
|
Each DTx is processed by the dtc compiler to produce a sorted dts source
|
||||||
|
file. If DTx is a dts source file then it is pre-processed in the same
|
||||||
|
manner as done for the compile of the dts source file in the Linux kernel
|
||||||
|
build 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. Two possible
|
||||||
|
workarounds:
|
||||||
|
|
||||||
|
`basename $0` \\
|
||||||
|
<(ARCH=arch_of_dtx_1 `basename $0` DTx_1) \\
|
||||||
|
<(ARCH=arch_of_dtx_2 `basename $0` DTx_2)
|
||||||
|
|
||||||
|
`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="$1"
|
||||||
|
|
||||||
|
if [ -d "${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} \
|
||||||
|
| ${DTC} -I dts ) ; then
|
||||||
|
return
|
||||||
|
fi
|
||||||
|
|
||||||
|
echo "" >&2
|
||||||
|
echo "Possible hints to resolve the above error:" >&2
|
||||||
|
echo " (hints might not fix the problem)" >&2
|
||||||
|
|
||||||
|
hint_given=0
|
||||||
|
|
||||||
|
if [ "${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}) does not match shell variable" >&2
|
||||||
|
echo " \$ARCH (${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
|
||||||
|
|
||||||
|
cmd_diff=0
|
||||||
|
diff_flags="-u"
|
||||||
|
dtx_file_1=""
|
||||||
|
dtx_file_2=""
|
||||||
|
dtc_sort="-s"
|
||||||
|
help=0
|
||||||
|
srctree=""
|
||||||
|
|
||||||
|
|
||||||
|
while [ $# -gt 0 ] ; do
|
||||||
|
|
||||||
|
case $1 in
|
||||||
|
|
||||||
|
-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
|
||||||
|
;;
|
||||||
|
|
||||||
|
-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=1
|
||||||
|
fi
|
||||||
|
|
||||||
|
if (( ${help} )) ; then
|
||||||
|
usage
|
||||||
|
exit 1
|
||||||
|
fi
|
||||||
|
|
||||||
|
# this must follow check for ${help}
|
||||||
|
if [ "${dtx_file_1}" = "" ]; then
|
||||||
|
echo "" >&2
|
||||||
|
echo "ERROR: parameter DTx required" >&2
|
||||||
|
echo "" >&2
|
||||||
|
exit 2
|
||||||
|
fi
|
||||||
|
|
||||||
|
|
||||||
|
# ----- 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 ( ! 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: ${DTC}
|
||||||
|
|
||||||
|
If it does not exist, create it from the root of the Linux source tree:
|
||||||
|
|
||||||
|
'make scripts'.
|
||||||
|
|
||||||
|
If not at the root of the Linux kernel source tree -s SRCTREE or -S
|
||||||
|
may need to be specified to find 'dtc'.
|
||||||
|
|
||||||
|
If 'O=\${dir}' is specified in your Linux builds, this script requires
|
||||||
|
'export KBUILD_OUTPUT=\${dir}' or add \${dir}/scripts/dtc to \$PATH
|
||||||
|
before running.
|
||||||
|
|
||||||
|
If \${KBUILD_OUTPUT} is a relative path, then '-s SRCDIR', -S, or run
|
||||||
|
this script from the root of the Linux kernel source tree is required.
|
||||||
|
|
||||||
|
Fallback '${__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}/arch/${ARCH}/boot/dts \
|
||||||
|
-I${srctree}/arch/${ARCH}/boot/dts/include \
|
||||||
|
-I${srctree}/drivers/of/testcase-data \
|
||||||
|
-undef -D__DTS__"
|
||||||
|
|
||||||
|
dtc_flags="\
|
||||||
|
-i ${srctree}/arch/${ARCH}/boot/dts/ \
|
||||||
|
-i ${srctree}/kernel/dts \
|
||||||
|
${dtx_path_1_dtc_include} \
|
||||||
|
${dtx_path_2_dtc_include}"
|
||||||
|
|
||||||
|
DTC="${DTC} ${dtc_flags} -O dts -qq -f ${dtc_sort} -o -"
|
||||||
|
|
||||||
|
|
||||||
|
# ----- do the diff or decompile
|
||||||
|
|
||||||
|
if (( ${cmd_diff} )) ; then
|
||||||
|
|
||||||
|
diff ${diff_flags} \
|
||||||
|
<(compile_to_dts "${dtx_file_1}") \
|
||||||
|
<(compile_to_dts "${dtx_file_2}")
|
||||||
|
|
||||||
|
else
|
||||||
|
|
||||||
|
compile_to_dts "${dtx_file_1}"
|
||||||
|
|
||||||
|
fi
|
||||||
Loading…
Reference in a new issue