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Makefile: Allow padding zeros when converting DTB to C source

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We extend d2c.sh to allow padding zeros in output C source when
converting DTB to C source. Using this feature, platforms can
create extra room for in-place FDT fixups on built-in DTBs.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Heinrich Schuchardt 2020-10-14 22:05:31 +05:30 • committed by Anup Patel
parent 9c07c513aa
commit e9a4bfb7b5
2 changed files with 13 additions and 3 deletions
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9
scripts/d2c.sh
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@ -9,6 +9,7 @@ function usage()
echo " -i <input_file_path> Input binary file path"
echo " -a <c_align> Output C array alignment"
echo " -p <c_prefix> Output C array name prefix"
echo " -t <num_zero_bytes> Output padding zero bytes"
exit 1;
}
@ -16,8 +17,9 @@ function usage()
INPUT_PATH=""
OUTPUT_C_ALIGN=""
OUTPUT_C_PREFIX=""
NUM_ZERO_BYTES=0
while getopts "hi:a:p:o:" o; do
while getopts "hi:a:p:t:" o; do
case "${o}" in
h)
usage
@ -31,6 +33,9 @@ while getopts "hi:a:p:o:" o; do
p)
OUTPUT_C_PREFIX=${OPTARG}
;;
t)
NUM_ZERO_BYTES=${OPTARG}
;;
*)
usage
;;
@ -62,6 +67,8 @@ printf "const char __attribute__((aligned(%s))) %s_start[] = {\n" "${OUTPUT_C_AL
od -v -t x1 -An ${INPUT_PATH} | awk '{for (i=1; i<=NF; i++) printf " 0x%s,", $i; printf "\n"; }'
echo __dummy__ | awk "{for (i=1; i<=${NUM_ZERO_BYTES}; i++) { printf \" 0x00,\"; if (i % 16 == 0) printf \"\n\"; } }"
printf "};\n"
printf "const unsigned long %s_size = sizeof(%s_start);\n" "${OUTPUT_C_PREFIX}" "${OUTPUT_C_PREFIX}"