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remarkable-linux/scripts/dtc/dtx_diff
Frank Rowand 60c7f4cb1f scripts/dtc: dtx_diff - add info to error message 
If kernel config options are not properly set, "make scripts" will not
compile dtc.  Update the unable to find dtc error message to check
the kernel config and give better advice on how to create dtc.

Reword another error message to increase clarity.

Signed-off-by: Frank Rowand <frank.rowand@sonymobile.com>
Signed-off-by: Rob Herring <robh@kernel.org>
2016-02-11 19:40:57 -06:00

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#! /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 ${dtx_arch} is in file path," >&2
echo " but does not match shell variable \$ARCH" >&2
echo " >>\$ARCH<< is: >>${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
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 grep -q "^CONFIG_DTC=y" ${__KBUILD_OUTPUT}/.config ; 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}/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
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