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Makefile: Add mechanism for platforms to have multiple builtin DTBs

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Currently, we can only include one DTB as builtin for a platform
using FDT_PAYLOAD_DTB make variable in platform config.mk.

This patch adds new mechanism using which we can convert any DTS
file to C source and futher compile-n-link it with libplatsbi.a.

The generated C source will have the DTB contents as an array
"const char <varprefix>_start[]" where <varprefix> is specified
in platform objects.mk makefile.

Example1
--------
If we have built-in k210.dts and desired <varprefix> is
"dt_k210" then specify following in platform objects.mk:
platform-objs-y += k210.o
platform-varprefix-k210.o = dt_k210

Example2
--------
If we have built-in abc/k210.dts and desired <varprefix> is
"dt_abc_k210" then specify following in platform objects.mk:
platform-objs-y += abc/k210.o
platform-varprefix-abc-k210.o = dt_abc_k210

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel 2020-05-25 14:42:35 +05:30 • committed by Anup Patel
parent c6c65ee861
commit 4e3876d5be
2 changed files with 84 additions and 0 deletions
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17
Makefile
View file

@ -290,6 +290,12 @@ compile_objcopy = $(CMD_PREFIX)mkdir -p `dirname $(1)`; \
compile_dts = $(CMD_PREFIX)mkdir -p `dirname $(1)`; \
echo " DTC $(subst $(build_dir)/,,$(1))"; \
$(CPP) $(DTSCPPFLAGS) $(2) | $(DTC) -O dtb -i `dirname $(2)` -o $(1)
compile_d2c = $(CMD_PREFIX)mkdir -p `dirname $(1)`; \
echo " D2C $(subst $(build_dir)/,,$(1))"; \
$(src_dir)/scripts/d2c.sh -i $(4) -a $(3) -p $(2) > $(1)
compile_gen_dep = $(CMD_PREFIX)mkdir -p `dirname $(1)`; \
echo " GEN-DEP $(subst $(build_dir)/,,$(1))"; \
echo "$(1:.dep=$(2)): $(3)" >> $(1)
targets-y = $(build_dir)/lib/libsbi.a
targets-y += $(build_dir)/lib/libsbiutils.a
@ -342,12 +348,23 @@ $(platform_build_dir)/%.dep: $(platform_src_dir)/%.c
$(platform_build_dir)/%.o: $(platform_src_dir)/%.c
$(call compile_cc,$@,$<)
$(platform_build_dir)/%.o: $(platform_build_dir)/%.c
$(call compile_cc,$@,$<)
$(platform_build_dir)/%.dep: $(platform_src_dir)/%.S
$(call compile_as_dep,$@,$<)
$(platform_build_dir)/%.o: $(platform_src_dir)/%.S
$(call compile_as,$@,$<)
$(platform_build_dir)/%.dep: $(platform_src_dir)/%.dts
$(call compile_gen_dep,$@,.dtb,$<)
$(call compile_gen_dep,$@,.c,$(@:.dep=.dtb))
$(call compile_gen_dep,$@,.o,$(@:.dep=.c))
$(platform_build_dir)/%.c: $(platform_build_dir)/%.dtb
$(call compile_d2c,$@,$(platform-varprefix-$(subst .dtb,.o,$(subst /,-,$(subst $(platform_build_dir)/,,$<)))),16,$<)
$(platform_build_dir)/%.dtb: $(platform_src_dir)/%.dts
$(call compile_dts,$@,$<)

67
scripts/d2c.sh Executable file
View file

@ -0,0 +1,67 @@
#!/bin/bash
function usage()
{
echo "Usage:"
echo " $0 [options]"
echo "Options:"
echo " -h Display help or usage"
echo " -i <input_file_path> Input binary file path"
echo " -a <c_align> Output C array alignment"
echo " -p <c_prefix> Output C array name prefix"
exit 1;
}
# Command line options
INPUT_PATH=""
OUTPUT_C_ALIGN=""
OUTPUT_C_PREFIX=""
while getopts "hi:a:p:o:" o; do
case "${o}" in
h)
usage
;;
i)
INPUT_PATH=${OPTARG}
;;
a)
OUTPUT_C_ALIGN=${OPTARG}
;;
p)
OUTPUT_C_PREFIX=${OPTARG}
;;
*)
usage
;;
esac
done
shift $((OPTIND-1))
if [ -z "${INPUT_PATH}" ]; then
echo "Must specify input file path"
usage
fi
if [ ! -f "${INPUT_PATH}" ]; then
echo "The input path should be a file"
usage
fi
if [ -z "${OUTPUT_C_ALIGN}" ]; then
echo "Must provide output C array alignment"
usage
fi
if [ -z "${OUTPUT_C_PREFIX}" ]; then
echo "Must provide output C array name prefix"
usage
fi
printf "const char __attribute__((aligned(%s))) %s_start[] = {\n" "${OUTPUT_C_ALIGN}" "${OUTPUT_C_PREFIX}"
od -v -t x1 -An ${INPUT_PATH} | awk '{for (i=1; i<=NF; i++) printf " 0x%s,", $i; printf "\n"; }'
printf "};\n"
printf "const unsigned long %s_size = sizeof(%s_start);\n" "${OUTPUT_C_PREFIX}" "${OUTPUT_C_PREFIX}"