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Makefile.mk
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Makefile.mk
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# SPDX-License-Identifier: GPL-2.0-only
ifneq ($(NOCOMPILE),1)
GIT:=$(shell git -C "$(top)" rev-parse --git-dir 1>/dev/null 2>&1 \
&& command -v git)
else
GIT:=
endif
#######################################################################
# normalize Kconfig variables in a central place
CONFIG_CBFS_PREFIX:=$(call strip_quotes,$(CONFIG_CBFS_PREFIX))
CONFIG_FMDFILE:=$(call strip_quotes,$(CONFIG_FMDFILE))
CONFIG_DEVICETREE:=$(call strip_quotes, $(CONFIG_DEVICETREE))
CONFIG_OVERRIDE_DEVICETREE:=$(call strip_quotes, $(CONFIG_OVERRIDE_DEVICETREE))
CONFIG_CHIPSET_DEVICETREE:=$(call strip_quotes, $(CONFIG_CHIPSET_DEVICETREE))
CONFIG_MEMLAYOUT_LD_FILE:=$(call strip_quotes, $(CONFIG_MEMLAYOUT_LD_FILE))
#######################################################################
# misleadingly named, this is the coreboot version
ifeq ($(KERNELVERSION),)
ifeq ($(BUILD_TIMELESS),1)
KERNELVERSION := -TIMELESS--LESSTIME-
else
KERNELVERSION := $(strip $(if $(GIT),\
$(shell git describe --abbrev=12 --dirty --always || git describe),\
$(if $(wildcard $(top)/.coreboot-version),\
$(shell cat $(top)/.coreboot-version),\
coreboot-unknown$(KERNELREVISION))))
endif
endif
COREBOOT_EXPORTS += KERNELVERSION
#######################################################################
# Basic component discovery
MAINBOARDDIR=$(call strip_quotes,$(CONFIG_MAINBOARD_DIR))
VARIANT_DIR:=$(call strip_quotes,$(CONFIG_VARIANT_DIR))
CARRIER_DIR:=$(call strip_quotes,$(CONFIG_CARRIER_DIR))
COREBOOT_EXPORTS += MAINBOARDDIR VARIANT_DIR CARRIER_DIR
## Final build results, which CBFSTOOL uses to create the final
## rom image file, are placed under $(objcbfs).
## These typically have suffixes .debug .elf .bin and .map
objcbfs := $(obj)/cbfs/$(CONFIG_CBFS_PREFIX)
additional-dirs += $(objcbfs)
COREBOOT_EXPORTS += objcbfs
## Based on the active configuration, Makefile conditionally collects
## the required assembly includes and saves them in a file.
## Such files that do not have a clear one-to-one relation to a source
## file under src/ are placed and built under $(objgenerated)
objgenerated := $(obj)/generated
additional-dirs += $(objgenerated)
COREBOOT_EXPORTS += objgenerated
## CCACHE_EXTRAFILES can be set by individual rules to help CCACHE
## discover dependencies it might not notice on its own (e.g. asm (".incbin")).
COREBOOT_EXPORTS += CCACHE_EXTRAFILES
#######################################################################
# root rule to resolve if in build mode (ie. configuration exists)
real-target: $(obj)/config.h coreboot files_added show_coreboot show_notices
coreboot: $(obj)/coreboot.rom $(obj)/cbfstool $(obj)/rmodtool $(obj)/ifwitool $(obj)/cse_fpt $(obj)/cse_serger
# This target can be used to run scripts or additional targets
# after the build completes by creating a target named 'build_complete::'
.PHONY: build_complete
build_complete:: | coreboot
# This target can be used to run rules after all files were added to CBFS,
# for example to process FMAP regions or the entire image.
.PHONY: files_added
files_added:: | build_complete
# This target should come just before the show_notices target. If there
# are no notices, the build should finish with the text of what was just
# built.
.PHONY: show_coreboot
show_coreboot: | files_added
$(CBFSTOOL) $(obj)/coreboot.rom print -r $(subst $(spc),$(comma),$(all-regions))
printf "\nBuilt %s (%s)\n" $(MAINBOARDDIR) $(CONFIG_MAINBOARD_PART_NUMBER)
if [ -f "$(CCACHE_STATSLOG)" ]; then \
printf "\nccache statistics\n"; \
$(CCACHE) --show-log-stats -v; \
fi
# This is intended to run at the *very end* of the build to show warnings
# notices and the like. If another target needs to be added, add it
# BEFORE this target.
.PHONY: show_notices
show_notices:: | show_coreboot
# This rule allows the site-local makefile to run before starting the actual
# coreboot build. It should not be used in the regular coreboot makefiles.
# Note: This gets run after the immediate makefile code like updating the
# submodules, but before any other targets.
.PHONY: site-local-target
site-local-target::
#######################################################################
# our phony targets
PHONY+= clean-abuild coreboot check-style build_complete
#######################################################################
# root source directories of coreboot
# site-local Makefile.mk must go first to override default locations (for binaries etc.)
subdirs-y := site-local
subdirs-y += src/lib src/commonlib/ src/console src/device src/acpi src/superio/common
subdirs-$(CONFIG_EC_ACPI) += src/ec/intel
subdirs-y += src/ec/acpi $(wildcard src/ec/*/*) $(wildcard src/southbridge/*/*)
subdirs-y += $(wildcard src/soc/*) $(wildcard src/soc/*/common) $(filter-out $(wildcard src/soc/*/common),$(wildcard src/soc/*/*))
subdirs-y += $(wildcard src/northbridge/*/*)
subdirs-y += $(filter-out src/superio/common,$(wildcard src/superio/*)) $(wildcard src/superio/*/*)
subdirs-y += $(wildcard src/drivers/*) $(wildcard src/drivers/*/*) $(wildcard src/drivers/*/*/*)
subdirs-y += src/cpu src/vendorcode
subdirs-y += util/cbfstool util/sconfig util/nvramtool util/pgtblgen util/amdfwtool
subdirs-y += util/futility util/marvell util/bincfg util/supermicro util/qemu
subdirs-y += util/ifdtool
subdirs-y += $(wildcard src/arch/*)
subdirs-y += src/mainboard/$(MAINBOARDDIR)
subdirs-y += src/security
subdirs-y += payloads payloads/external
subdirs-$(CONFIG_SBOM) += src/sbom
subdirs-y += util/checklist util/testing
#######################################################################
# Add source classes and their build options
classes-y := ramstage romstage bootblock decompressor postcar smm smmstub cpu_microcode verstage
# Add a special 'all' class to add sources to all stages
$(call add-special-class,all)
all-handler = $(foreach class,bootblock verstage romstage postcar ramstage,$(eval $(class)-y += $(2)))
$(call add-special-class,all_x86)
all_x86-handler = $(foreach class,bootblock verstage_x86 romstage postcar ramstage,$(eval $(class)-y += $(2)))
$(call add-special-class,verstage_x86)
ifeq ($(CONFIG_ARCH_VERSTAGE_X86_32)$(CONFIG_ARCH_VERSTAGE_X86_64),y)
verstage_x86-handler = $(eval verstage-y += $(2))
else
verstage_x86-handler =
endif
# Add dynamic classes for rmodules
$(foreach supported_arch,$(ARCH_SUPPORTED), \
$(eval $(call define_class,rmodules_$(supported_arch),$(supported_arch))))
# Provide a macro to determine environment for free standing rmodules.
$(foreach supported_arch,$(ARCH_SUPPORTED), \
$(eval rmodules_$(supported_arch)-generic-ccopts += -D__RMODULE__))
#######################################################################
# Helper functions for math, strings, and various file placement matters.
# macros work on all formats understood by printf(1)
# values are space separated if using more than one value
#
# int-add: adds an arbitrary length list of integers
# int-subtract: subtracts the second of two integers from the first
# int-multiply: multiplies an arbitrary length list of integers
# int-divide: divides the first integer by the second
# int-remainder: arithmetic remainder of the first number divided by the second
# int-shift-left: Shift $1 left by $2 bits
# int-lt: 1 if the first value is less than the second. 0 otherwise
# int-gt: 1 if the first values is greater than the second. 0 otherwise
# int-eq: 1 if the two values are equal. 0 otherwise
# int-align: align $1 to $2 units
# file-size: returns the filesize of the given file
# tolower: returns the value in all lowercase
# toupper: returns the value in all uppercase
# ws_to_under: returns the value with any whitespace changed to underscores
# get_fmap_value returns the value of a given FMAP field from fmap_config.h
_toint=$(shell printf "%d" $1)
_tohex=$(shell printf 0x"%x" $1)
_int-add2=$(shell expr $(call _toint,$1) + $(call _toint,$2))
int-add=$(if $(filter 1,$(words $1)),$(strip $1),$(call int-add,$(call _int-add2,$(word 1,$1),$(word 2,$1)) $(wordlist 3,$(words $1),$1)))
int-subtract=$(if $(filter 1,$(words $1)),$(strip $1),$(shell expr $(call _toint,$(word 1,$1)) - $(call _toint,$(word 2,$1))))
_int-multiply2=$(shell expr $(call _toint,$1) \* $(call _toint,$2))
int-multiply=$(if $(filter 1,$(words $1)),$(strip $1),$(call int-multiply,$(call _int-multiply2,$(word 1,$1),$(word 2,$1)) $(wordlist 3,$(words $1),$1)))
int-divide=$(if $(filter 1,$(words $1)),$(strip $1),$(shell expr $(call _toint,$(word 1,$1)) / $(call _toint,$(word 2,$1))))
int-remainder=$(if $(filter 1,$(words $1)),$(strip $1),$(shell expr $(call _toint,$(word 1,$1)) % $(call _toint,$(word 2,$1))))
int-shift-left=$(shell echo "$(call _toint,$(word 1, $1)) * (2 ^ $(call _toint,$(word 2, $1)))" | bc)
int-lt=$(if $(filter 1,$(words $1)),$(strip $1),$(shell expr $(call _toint,$(word 1,$1)) \< $(call _toint,$(word 2,$1))))
int-gt=$(if $(filter 1,$(words $1)),$(strip $1),$(shell expr $(call _toint,$(word 1,$1)) \> $(call _toint,$(word 2,$1))))
int-eq=$(if $(filter 1,$(words $1)),$(strip $1),$(shell expr $(call _toint,$(word 1,$1)) = $(call _toint,$(word 2,$1))))
int-align=$(shell A=$(call _toint,$1) B=$(call _toint,$2); expr $$A + \( \( $$B - \( $$A % $$B \) \) % $$B \) )
int-align-down=$(shell A=$(call _toint,$1) B=$(call _toint,$2); expr $$A - \( $$A % $$B \) )
file-size=$(strip $(shell wc -c "$1" | cut -f 1 -d ' '))
tolower=$(shell echo '$1' | tr '[:upper:]' '[:lower:]')
toupper=$(shell echo '$1' | tr '[:lower:]' '[:upper:]')
ws_to_under=$(shell echo '$1' | tr ' \t' '_')
get_fmap_value=$(shell awk '$$2 == "$1" {print $$3}' $(obj)/fmap_config.h)
#######################################################################
# Helper functions for ramstage postprocess
spc :=
spc := $(spc) $(spc)
comma := ,
# Returns all files and dirs below `dir` (recursively).
# files-below-dir,dir,files
files-below-dir=$(filter $(1)%,$(2))
# Returns all dirs below `dir` (recursively).
# dirs-below-dir,dir,files
dirs-below-dir=$(filter-out $(1),$(sort $(dir $(call files-below-dir,$(1),$(2)))))
# Returns all files directly in `dir` (non-recursively).
# files-in-dir,dir,files
files-in-dir=$(filter-out $(addsuffix %,$(call dirs-below-dir,$(1),$(2))),$(call files-below-dir,$(1),$(2)))
#######################################################################
# reduce command line length by linking the objects of each
# directory into an intermediate file
ramstage-postprocess=$$(eval DEPENDENCIES+=$$(addsuffix .d,$$(basename $(1)))) \
$(foreach d,$(sort $(dir $(filter-out %.ld,$(1)))), \
$(eval $(d)ramstage.a: $(call files-in-dir,$(d),$(filter-out %.ld,$(1))); rm -f $$@ && $(AR_ramstage) rcsT $$@ $$^ ) \
$(eval ramstage-objs:=$(d)ramstage.a $(filter-out $(filter-out %.ld, $(call files-in-dir,$(d),$(1))),$(ramstage-objs))))
decompressor-generic-ccopts += -D__DECOMPRESSOR__
bootblock-generic-ccopts += -D__BOOTBLOCK__
romstage-generic-ccopts += -D__ROMSTAGE__
ramstage-generic-ccopts += -D__RAMSTAGE__
ifeq ($(CONFIG_COVERAGE),y)
ramstage-c-ccopts += -fprofile-arcs -ftest-coverage
endif
ifneq ($(GIT),)
ifneq ($(UPDATED_SUBMODULES),1)
$(info Updating git submodules.)
# try to fetch non-optional submodules if the source is under git
forgetthis:=$(shell git submodule update --init $(quiet_errors))
# Checkout Cmocka repository
forgetthis:=$(shell git submodule update --init --checkout 3rdparty/cmocka $(quiet_errors))
ifeq ($(CONFIG_USE_BLOBS),y)
# These items are necessary because each has update=none in .gitmodules. They are ignored
# until expressly requested and enabled with --checkout
forgetthis:=$(shell git submodule update --init --checkout 3rdparty/blobs $(quiet_errors))
forgetthis:=$(shell git submodule update --init --checkout 3rdparty/intel-microcode $(quiet_errors))
ifeq ($(CONFIG_FSP_USE_REPO),y)
forgetthis:=$(shell git submodule update --init --checkout 3rdparty/fsp $(quiet_errors))
endif
ifeq ($(CONFIG_USE_AMD_BLOBS),y)
forgetthis:=$(shell git submodule update --init --checkout 3rdparty/amd_blobs $(quiet_errors))
endif
ifeq ($(CONFIG_USE_QC_BLOBS),y)
forgetthis:=$(shell git submodule update --init --checkout 3rdparty/qc_blobs $(quiet_errors))
endif
endif
UPDATED_SUBMODULES:=1
COREBOOT_EXPORTS += UPDATED_SUBMODULES
endif
endif # GIT != ""
postcar-c-deps:=$$(OPTION_TABLE_H)
ramstage-c-deps:=$$(OPTION_TABLE_H)
romstage-c-deps:=$$(OPTION_TABLE_H)
verstage-c-deps:=$$(OPTION_TABLE_H)
bootblock-c-deps:=$$(OPTION_TABLE_H)
$(foreach type,ads adb, \
$(foreach stage,$(COREBOOT_STANDARD_STAGES), \
$(eval $(stage)-$(type)-deps := \
$(obj)/$(stage)/$(notdir $(KCONFIG_AUTOADS)) \
$(obj)/libgnat-$(ARCH-$(stage)-y)/libgnat.a)))
# Add handler to copy linker scripts
define generic-objs_ld_template_gen
de$(EMPTY)fine $(1)-objs_ld_template
$$(call src-to-obj,$1,$$(1).ld): $$(1).ld $(obj)/config.h $(obj)/fmap_config.h
@printf " CP $$$$(subst $$$$(obj)/,,$$$$(@))\n"
$$(CC_$(1)) -MMD $$(CPPFLAGS_$(1)) $$($(1)-ld-ccopts) $(PREPROCESS_ONLY) -include $(obj)/config.h -MT $$$$@ -o $$$$@ $$$$<
en$(EMPTY)def
endef
# Add handler to deal with archives
define generic-objs_a_template_gen
de$(EMPTY)fine $(1)-objs_a_template
$$(call src-to-obj,$1,$$(1).a): $$(1).a
@printf " AR $$$$(subst $$$$(obj)/,,$$$$(@))\n"
$$$$(AR_$(1)) rcsT $$$$@.tmp $$$$<
mv $$$$@.tmp $$$$@
en$(EMPTY)def
endef
# Add handler to add no rules for manual files
define generic-objs_manual_template_gen
# do nothing
endef
#######################################################################
# Add handler to compile ACPI's ASL
# arg1: base file name
# arg2: y or n for including in cbfs. defaults to y
# Empty resource templates were marked as a warning in IASL with the comment
# "This would appear to be worthless in real-world ASL code.", which is
# possibly true in many cases. In other cases it seems that an empty
# ResourceTemplate is the correct code.
# As it's valid ASL, disable the warning.
EMPTY_RESOURCE_TEMPLATE_WARNING = 3150
IASL_WARNINGS_LIST = $(EMPTY_RESOURCE_TEMPLATE_WARNING)
IGNORED_IASL_WARNINGS = $(addprefix -vw , $(IASL_WARNINGS_LIST))
define asl_template
$(CONFIG_CBFS_PREFIX)/$(1).aml-file = $(obj)/$(1).aml
$(CONFIG_CBFS_PREFIX)/$(1).aml-type = raw
$(CONFIG_CBFS_PREFIX)/$(1).aml-compression = none
ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_LPC_SPI_DMA),y)
$(CONFIG_CBFS_PREFIX)/$(1).aml-align = 64
endif
cbfs-files-$(if $(2),$(2),y) += $(CONFIG_CBFS_PREFIX)/$(1).aml
$(eval DEPENDENCIES += $(obj)/$(1).d)
$(obj)/$(1).aml: $(src)/mainboard/$(MAINBOARDDIR)/$(1).asl $(obj)/config.h
@printf " IASL $$(subst $(top)/,,$$(@))\n"
$(CC_ramstage) -x assembler-with-cpp -E -MMD -MT $$(@) $$(CPPFLAGS_ramstage) -D__ACPI__ -P -include $(src)/include/kconfig.h -I$(obj) -I$(src) -I$(src)/include -I$(src)/arch/$(ARCHDIR-$(ARCH-ramstage-y))/include -I$(src)/mainboard/$(MAINBOARDDIR) $$< -o $(obj)/$(1).asl
cd $$(dir $$@); $(IASL) $(IGNORED_IASL_WARNINGS) -we -p $$(notdir $$@) $(1).asl
echo " IASL "$(IASL_WARNINGS_LIST)" warning types were ignored!"
if ! $(IASL) -d $$@ 2>&1 | grep -Eq 'ACPI (Warning|Error)'; then \
echo " IASL $$@ disassembled correctly."; \
true; \
else \
echo "Error: Could not correctly disassemble $$@"; \
$(IASL) -d $$@; \
false; \
fi
endef
#######################################################################
# Parse plaintext CMOS defaults into binary format
# arg1: source file
# arg2: binary file name
cbfs-files-processor-nvramtool= \
$(eval $(2): $(1) $(top)/$(call strip_quotes,$(CONFIG_CMOS_LAYOUT_FILE)) | $(objutil)/nvramtool/nvramtool ; \
printf " CREATE $(2) (from $(1))\n"; \
$(objutil)/nvramtool/nvramtool -y $(top)/$(call strip_quotes,$(CONFIG_CMOS_LAYOUT_FILE)) -D $(2).tmp -p $(1) && \
mv $(2).tmp $(2))
#######################################################################
# Reduce a .config file by removing lines about default unset booleans
# arg1: input
# arg2: output
define cbfs-files-processor-config
$(eval $(2): $(1) $(obj)/build.h $(objutil)/kconfig/conf; \
+printf " CREATE $(2) (from $(1))\n"; \
printf "# This image was built using coreboot " > $(2).tmp && \
grep "\<COREBOOT_VERSION\>" $(obj)/build.h |cut -d\" -f2 >> $(2).tmp && \
$(MAKE) DOTCONFIG=$(1) DEFCONFIG=$(2).tmp2 savedefconfig && \
cat $(2).tmp2 >> $(2).tmp && \
printf "# End of defconfig. Derivable values start here.\n" >> $(2).tmp && \
grep "^CONFIG" $(1) | grep -F -v -f $(2).tmp2 >> $(2).tmp && \
rm -f $(2).tmp2 && \
mv -f $(2).tmp $(2))
endef
#######################################################################
# Add a file to CBFS with just type and compression values
# arg1: name in CBFS
# arg2: filename and path
# arg3: type in CBFS
# arg4: compression type
define add-cbfs-file-simple
$(eval cbfs-files-y += $(1))
$(eval $(1)-file := $(2))
$(eval $(1)-type := $(3))
$(eval $(1)-compression := $(4))
endef
#######################################################################
# Compile a C file with a bare struct definition into binary
# arg1: C source file
# arg2: binary file
cbfs-files-processor-struct= \
$(eval $(2): $(1) $(obj)/build.h $(obj)/fmap_config.h $(KCONFIG_AUTOHEADER); \
printf " CC+STRIP $(1)\n"; \
$(CC_ramstage) -MMD $(CPPFLAGS_ramstage) $(CFLAGS_ramstage) --param asan-globals=0 $$(ramstage-c-ccopts) -include $(KCONFIG_AUTOHEADER) -MT $(2) -o $(2).tmp -c $(1) && \
$(OBJCOPY_ramstage) -O binary --only-section='.*data*' --only-section='.*bss*' \
--set-section-flags .*bss*=alloc,contents,load $(2).tmp $(2); \
rm -f $(2).tmp) \
$(eval DEPENDENCIES += $(2).d)
#######################################################################
# Convert image to YCC 4:2:0 JPEG
#
# In two steps:
# 1. Convert to RGB colors, optionally resize and store as BMP.
# 2. Round final size to multiples of 16, optionally swap colors,
# convert (back) to sRGB and store as JPEG.
# The split is necessary because we don't know the exact, scaled
# size due to aspect-ratio. Note: IM v7 would allow us to do the
# calculations in one command using %[fx:...] syntax.
#
# arg1: image input file
# arg2: output jpg
cbfs-files-processor-jpg420= \
$(eval $(2): $(1) $(KCONFIG_AUTOCONFIG); \
printf " CONVERT $$<\n"; \
res=$(CONFIG_BOOTSPLASH_CONVERT_RESOLUTION); \
res=$$$$(convert $$< \
-colorspace RGB \
$$(BOOTSPLASH_RESIZE-y) \
-format '%wx%h' -write info: \
bmp:$$@); \
convert $$@ \
$$(BOOTSPLASH_ROUND16) \
$$(BOOTSPLASH_COLORSWAP-y) \
-colorspace sRGB \
-quality $$(CONFIG_BOOTSPLASH_CONVERT_QUALITY)% \
-interlace none -colorspace YCC -sampling-factor 4:2:0 \
jpg:$$@)
BOOTSPLASH_FLOOR = $$(($${res%%x*} & ~15))x$$(($${res\#\#*x} & ~15))
BOOTSPLASH_RESIZE-$(CONFIG_BOOTSPLASH_CONVERT_RESIZE) = -resize $(BOOTSPLASH_FLOOR)
BOOTSPLASH_CEIL = $$((($${res%%x*} + 15) & ~15))x$$((($${res\#\#*x} + 15) & ~15))
BOOTSPLASH_ROUND16 = -background black -gravity center -extent $(BOOTSPLASH_CEIL)
BOOTSPLASH_COLORSWAP-$(CONFIG_BOOTSPLASH_CONVERT_COLORSWAP) := -channel-fx 'red<=>blue'
#######################################################################
# Add handler for arbitrary files in CBFS
$(call add-special-class,cbfs-files)
cbfs-files-handler= \
$(eval tmp-cbfs-method:=$(word 2, $(subst :, ,$($(2)-file)))) \
$(eval $(2)-file:=$(call strip_quotes,$(word 1, $(subst :, ,$($(2)-file))))) \
$(eval tmp-cbfs-file:= ) \
$(if $($(2)-file), \
$(if $(wildcard $(1)$($(2)-file)), \
$(eval tmp-cbfs-file:= $(wildcard $(1)$($(2)-file))), \
$(eval tmp-cbfs-file:= $($(2)-file)))) \
$(if $(strip $($(2)-required)), \
$(if $(wildcard $(tmp-cbfs-file)),, \
$(info This build configuration requires $($(2)-required)) \
$(eval FAILBUILD:=1) \
)) \
$(if $(strip $($(2)-align)), \
$(if $(strip $($(2)-position)), \
$(info ERROR: It is not allowed to specify both alignment and position for $($(2)-file)) \
$(eval FAILBUILD:=1) \
)) \
$(if $(tmp-cbfs-method), \
$(eval tmp-old-cbfs-file:=$(tmp-cbfs-file)) \
$(eval tmp-cbfs-file:=$(shell mkdir -p $(obj)/mainboard/$(MAINBOARDDIR); mktemp $(obj)/mainboard/$(MAINBOARDDIR)/cbfs-file.XXXXXX).out) \
$(call cbfs-files-processor-$(tmp-cbfs-method),$(tmp-old-cbfs-file),$(tmp-cbfs-file))) \
$(if $(tmp-cbfs-file), \
$(eval cbfs-files += $(subst $(spc),*,$(tmp-cbfs-file)|$(2)|$($(2)-type)|$($(2)-compression)|$(strip $($(2)-position))|$($(2)-align)|$($(2)-options)))) \
$(eval $(2)-name:=) \
$(eval $(2)-type:=) \
$(eval $(2)-compression:=) \
$(eval $(2)-position:=) \
$(eval $(2)-required:=) \
$(eval $(2)-options:=) \
$(eval $(2)-align:=)
#######################################################################
# a variety of flags for our build
CBFS_COMPRESS_FLAG:=none
ifeq ($(CONFIG_COMPRESS_RAMSTAGE_LZMA),y)
CBFS_COMPRESS_FLAG:=LZMA
endif
ifeq ($(CONFIG_COMPRESS_RAMSTAGE_LZ4),y)
CBFS_COMPRESS_FLAG:=LZ4
endif
CBFS_PAYLOAD_COMPRESS_FLAG:=none
ifeq ($(CONFIG_COMPRESSED_PAYLOAD_LZMA),y)
CBFS_PAYLOAD_COMPRESS_FLAG:=LZMA
endif
ifeq ($(CONFIG_COMPRESSED_PAYLOAD_LZ4),y)
CBFS_PAYLOAD_COMPRESS_FLAG:=LZ4
endif
CBFS_SECONDARY_PAYLOAD_COMPRESS_FLAG:=none
ifeq ($(CONFIG_COMPRESS_SECONDARY_PAYLOAD),y)
CBFS_SECONDARY_PAYLOAD_COMPRESS_FLAG:=LZMA
endif
CBFS_PRERAM_COMPRESS_FLAG:=none
ifeq ($(CONFIG_COMPRESS_PRERAM_STAGES),y)
CBFS_PRERAM_COMPRESS_FLAG:=LZ4
endif
ifneq ($(CONFIG_LOCALVERSION),"")
COREBOOT_EXTRA_VERSION := -$(call strip_quotes,$(CONFIG_LOCALVERSION))
COREBOOT_EXPORTS += COREBOOT_EXTRA_VERSION
endif
CPPFLAGS_common := -Isrc
CPPFLAGS_common += -Isrc/include
CPPFLAGS_common += -Isrc/commonlib/include
CPPFLAGS_common += -Isrc/commonlib/bsd/include
CPPFLAGS_common += -I$(obj)
VBOOT_SOURCE ?= 3rdparty/vboot
CPPFLAGS_common += -I$(VBOOT_SOURCE)/firmware/include
CPPFLAGS_common += -include $(src)/include/kconfig.h
CPPFLAGS_common += -include $(src)/include/rules.h
CPPFLAGS_common += -include $(src)/commonlib/bsd/include/commonlib/bsd/compiler.h
CPPFLAGS_common += -I3rdparty
CPPFLAGS_common += -D__BUILD_DIR__=\"$(obj)\"
CPPFLAGS_common += -D__COREBOOT__
ifeq ($(BUILD_TIMELESS),1)
CPPFLAGS_common += -D__TIMELESS__
endif
ifeq ($(CONFIG_PCI_OPTION_ROM_RUN_YABEL)$(CONFIG_PCI_OPTION_ROM_RUN_REALMODE),y)
CPPFLAGS_ramstage += -Isrc/device/oprom/include
endif
CFLAGS_common += -pipe
CFLAGS_common += -g
CFLAGS_common += -nostdinc
CFLAGS_common += -std=gnu11
CFLAGS_common += -nostdlib
CFLAGS_common += -Wall
CFLAGS_common += -Wundef
CFLAGS_common += -Wstrict-prototypes
CFLAGS_common += -Wmissing-prototypes
CFLAGS_common += -Wwrite-strings
CFLAGS_common += -Wredundant-decls
CFLAGS_common += -Wno-trigraphs
CFLAGS_common += -Wimplicit-fallthrough
CFLAGS_common += -Wshadow
CFLAGS_common += -Wdate-time
CFLAGS_common += -Wtype-limits
CFLAGS_common += -Wvla
CFLAGS_common += -Wold-style-definition
CFLAGS_common += -Wdangling-else
CFLAGS_common += -Wmissing-include-dirs
CFLAGS_common += -fno-common
CFLAGS_common += -ffreestanding
CFLAGS_common += -fno-builtin
CFLAGS_common += -fomit-frame-pointer
CFLAGS_common += -fstrict-aliasing
CFLAGS_common += -ffunction-sections
CFLAGS_common += -fdata-sections
CFLAGS_common += -fno-pie
CFLAGS_common += -Wstring-compare
ifeq ($(CONFIG_COMPILER_GCC),y)
CFLAGS_common += -Wold-style-declaration
CFLAGS_common += -Wcast-function-type
# Don't add these GCC specific flags when running scan-build
ifeq ($(CCC_ANALYZER_OUTPUT_FORMAT),)
CFLAGS_common += -Wno-packed-not-aligned
CFLAGS_common += -fconserve-stack
CFLAGS_common += -Wnull-dereference
CFLAGS_common += -Wlogical-op
CFLAGS_common += -Wduplicated-cond
CFLAGS_common += -Wno-array-compare
endif
endif
ADAFLAGS_common += -gnatp
ADAFLAGS_common += -Wuninitialized
ADAFLAGS_common += -Wall
ADAFLAGS_common += -Werror
ADAFLAGS_common += -pipe
ADAFLAGS_common += -g
ADAFLAGS_common += -nostdinc
ADAFLAGS_common += -Wstrict-aliasing
ADAFLAGS_common += -Wshadow
ADAFLAGS_common += -fno-common
ADAFLAGS_common += -fomit-frame-pointer
ADAFLAGS_common += -ffunction-sections
ADAFLAGS_common += -fdata-sections
ADAFLAGS_common += -fno-pie
# Ada warning options:
#
# a Activate most optional warnings.
# .e Activate every optional warnings.
# e Treat warnings and style checks as errors.
#
# D Suppress warnings on implicit dereferences:
# As SPARK does not accept access types we have to map the
# dynamically chosen register locations to a static SPARK
# variable.
#
# .H Suppress warnings on holes/gaps in records:
# We are modelling hardware here!
#
# H Suppress warnings on hiding:
# It's too annoying, you run out of ideas for identifiers fast.
#
# T Suppress warnings for tracking of deleted conditional code:
# We use static options to select code paths at compile time.
#
# U Suppress warnings on unused entities:
# Would have lots of warnings for unused register definitions,
# `withs` for debugging etc.
#
# .U Deactivate warnings on unordered enumeration types:
# As SPARK doesn't support `pragma Ordered` by now, we don't
# use that, yet.
#
# .W Suppress warnings on unnecessary Warnings Off pragmas:
# Things get really messy when you use different compiler
# versions, otherwise.
# .Y Disable information messages for why package spec needs body:
# Those messages are annoying. But don't forget to enable those,
# if you need the information.
ADAFLAGS_common += -gnatwa.eeD.HHTU.U.W.Y
# Disable style checks for now
ADAFLAGS_common += -gnatyN
LDFLAGS_common := --gc-sections
LDFLAGS_common += -nostdlib
LDFLAGS_common += --nmagic
LDFLAGS_common += -static
# Workaround for RISC-V linker bug, merge back into above line when fixed.
# https://sourceware.org/bugzilla/show_bug.cgi?id=27180
ifneq ($(CONFIG_ARCH_RISCV),y)
LDFLAGS_common += --emit-relocs
endif
ifeq ($(CONFIG_WARNINGS_ARE_ERRORS),y)
CFLAGS_common += -Werror
endif
ifneq ($(GDB_DEBUG),)
CFLAGS_common += -Og
ADAFLAGS_common += -Og
else
CFLAGS_common += -Os
ADAFLAGS_common += -Os
endif
ifeq ($(CONFIG_DEBUG_ADA_CODE),y)
ADAFLAGS_common += -gnata
endif
additional-dirs += $(objutil)/cbfstool $(objutil)/ifdtool \
$(objutil)/options $(objutil)/amdfwtool \
$(objutil)/cbootimage
export $(COREBOOT_EXPORTS)
#######################################################################
# generate build support files
build_h := $(obj)/build.h
# We have to manually export variables that `genbuild_h.sh` uses
# when we call it through the `$(shell)` function. This is fragile
# but as variables newly added to `genbuild_h.sh` would just not
# work, we'd notice that instantly at least.
build_h_exports := BUILD_TIMELESS KERNELVERSION COREBOOT_EXTRA_VERSION
# Report new `build.ht` as dependency if `build.h` differs.
build_h_check := \
export $(foreach exp,$(build_h_exports),$(exp)="$($(exp))"); \
util/genbuild_h/genbuild_h.sh $(xcompile) \
>$(build_h)t 2>/dev/null; \
cmp -s $(build_h)t $(build_h) >/dev/null 2>&1 || echo $(build_h)t
$(build_h): $$(shell $$(build_h_check))
@printf " GEN build.h\n"
mv $< $@
$(obj)/build_info:
@echo 'COREBOOT_VERSION: $(call strip_quotes,$(KERNELVERSION))' > $@.tmp
@echo 'MAINBOARD_VENDOR: $(call strip_quotes,$(CONFIG_MAINBOARD_VENDOR))' >> $@.tmp
@echo 'MAINBOARD_PART_NUMBER: $(call strip_quotes,$(CONFIG_MAINBOARD_PART_NUMBER))' >> $@.tmp
mv $@.tmp $@
#######################################################################
# Build the tools
CBFSTOOL:=$(objutil)/cbfstool/cbfstool
FMAPTOOL:=$(objutil)/cbfstool/fmaptool
RMODTOOL:=$(objutil)/cbfstool/rmodtool
IFWITOOL:=$(objutil)/cbfstool/ifwitool
IFITTOOL:=$(objutil)/cbfstool/ifittool
AMDCOMPRESS:=$(objutil)/cbfstool/amdcompress
CSE_FPT:=$(objutil)/cbfstool/cse_fpt
CSE_SERGER:=$(objutil)/cbfstool/cse_serger
$(obj)/cbfstool: $(CBFSTOOL)
cp $< $@
$(obj)/fmaptool: $(FMAPTOOL)
cp $< $@
$(obj)/rmodtool: $(RMODTOOL)
cp $< $@
$(obj)/ifwitool: $(IFWITOOL)
cp $< $@
$(obj)/ifittool: $(IFITTOOL)
cp $< $@
$(obj)/amdcompress: $(AMDCOMPRESS)
cp $< $@
$(obj)/cse_fpt: $(CSE_FPT)
cp $< $@
$(obj)/cse_serger: $(CSE_SERGER)
cp $< $@
_WINCHECK=$(shell uname -o 2> /dev/null)
STACK=
ifeq ($(_WINCHECK),Msys)
STACK=-Wl,--stack,16384000
endif
ifeq ($(_WINCHECK),Cygwin)
STACK=-Wl,--stack,16384000
endif
BINCFG:=$(objutil)/bincfg/bincfg
IFDTOOL:=$(objutil)/ifdtool/ifdtool
AMDFWTOOL:=$(objutil)/amdfwtool/amdfwtool
AMDFWREAD:=$(objutil)/amdfwtool/amdfwread
APCB_EDIT_TOOL:=$(top)/util/apcb/apcb_edit.py
APCB_V3_EDIT_TOOL:=$(top)/util/apcb/apcb_v3_edit.py
APCB_V3A_EDIT_TOOL:=$(top)/util/apcb/apcb_v3a_edit.py
CBOOTIMAGE:=$(objutil)/cbootimage/cbootimage
FUTILITY?=$(objutil)/futility/futility
subdirs-y += util/nvidia
$(obj)/config.h: $(objutil)/kconfig/conf
#######################################################################
# needed objects that every mainboard uses
# Creation of these is architecture and mainboard independent
DEVICETREE_FILE := $(src)/mainboard/$(MAINBOARDDIR)/$(CONFIG_DEVICETREE)
SCONFIG_OPTIONS := --mainboard_devtree=$(DEVICETREE_FILE)
ifneq ($(CONFIG_OVERRIDE_DEVICETREE),)
OVERRIDE_DEVICETREE_FILE := $(src)/mainboard/$(MAINBOARDDIR)/$(CONFIG_OVERRIDE_DEVICETREE)
SCONFIG_OPTIONS += --override_devtree=$(OVERRIDE_DEVICETREE_FILE)
endif
ifneq ($(CONFIG_CHIPSET_DEVICETREE),)
CHIPSET_DEVICETREE_FILE := $(src)/$(CONFIG_CHIPSET_DEVICETREE)
SCONFIG_OPTIONS += --chipset_devtree=$(CHIPSET_DEVICETREE_FILE)
endif
DEVICETREE_STATIC_C := $(obj)/mainboard/$(MAINBOARDDIR)/static.c
SCONFIG_OPTIONS += --output_c=$(DEVICETREE_STATIC_C)
DEVICETREE_STATIC_H := $(obj)/static.h
SCONFIG_OPTIONS += --output_h=$(DEVICETREE_STATIC_H)
DEVICETREE_DEVICENAMES_H := $(obj)/static_devices.h
SCONFIG_OPTIONS += --output_d=$(DEVICETREE_DEVICENAMES_H)
DEVICETREE_FWCONFIG_H := $(obj)/static_fw_config.h
SCONFIG_OPTIONS += --output_f=$(DEVICETREE_FWCONFIG_H)
$(DEVICETREE_STATIC_C): $(DEVICETREE_FILE) $(OVERRIDE_DEVICETREE_FILE) $(CHIPSET_DEVICETREE_FILE) $(objutil)/sconfig/sconfig
@printf " SCONFIG $(subst $(src)/,,$(<))\n"
mkdir -p $(dir $(DEVICETREE_STATIC_C))
$(objutil)/sconfig/sconfig $(SCONFIG_OPTIONS)
ramstage-y+=$(DEVICETREE_STATIC_C)
romstage-y+=$(DEVICETREE_STATIC_C)
verstage-y+=$(DEVICETREE_STATIC_C)
bootblock-y+=$(DEVICETREE_STATIC_C)
postcar-y+=$(DEVICETREE_STATIC_C)
smm-y+=$(DEVICETREE_STATIC_C)
# Ensure static.c and static.h are created before any objects are compiled
ramstage-c-deps+=$(DEVICETREE_STATIC_C)
romstage-c-deps+=$(DEVICETREE_STATIC_C)
verstage-c-deps+=$(DEVICETREE_STATIC_C)
bootblock-c-deps+=$(DEVICETREE_STATIC_C)
postcar-c-deps+=$(DEVICETREE_STATIC_C)
smm-c-deps+=$(DEVICETREE_STATIC_C)
# Ensure fmap_config.h are created before any objects are compiled
ramstage-c-deps+=$(obj)/fmap_config.h
romstage-c-deps+=$(obj)/fmap_config.h
verstage-c-deps+=$(obj)/fmap_config.h
bootblock-c-deps+=$(obj)/fmap_config.h
postcar-c-deps+=$(obj)/fmap_config.h
smm-c-deps+=$(obj)/fmap_config.h
.PHONY: devicetree
devicetree: $(DEVICETREE_STATIC_C)
ramstage-y += $(CONFIG_MEMLAYOUT_LD_FILE)
romstage-y += $(CONFIG_MEMLAYOUT_LD_FILE)
bootblock-y += $(CONFIG_MEMLAYOUT_LD_FILE)
verstage-y += $(CONFIG_MEMLAYOUT_LD_FILE)
postcar-y += $(CONFIG_MEMLAYOUT_LD_FILE)
decompressor-y += $(CONFIG_MEMLAYOUT_LD_FILE)
#######################################################################
# Clean up rules
clean-abuild:
rm -rf coreboot-builds
#######################################################################
# Development utilities
printcrt0s:
@echo crt0s=$(crt0s)
@echo ldscripts=$(ldscripts)
update:
dongle.py -c /dev/term/1 $(obj)/coreboot.rom EOF
check-style:
grep "^# DESCR:" util/lint/check-style | sed "s,.*DESCR: *,,"
echo "========"
util/lint/check-style
echo "========"
gitconfig:
util/gitconfig/gitconfig.sh "$(MAKE)"
install-git-commit-clangfmt:
cp util/scripts/prepare-commit-msg.clang-format .git/hooks/prepare-commit-msg
include util/crossgcc/Makefile.mk
.PHONY: tools
tools: $(objutil)/kconfig/conf $(objutil)/kconfig/toada $(CBFSTOOL) $(objutil)/cbfstool/cbfs-compression-tool $(FMAPTOOL) $(RMODTOOL) $(IFWITOOL) $(objutil)/nvramtool/nvramtool $(objutil)/sconfig/sconfig $(IFDTOOL) $(CBOOTIMAGE) $(AMDFWTOOL) $(AMDCOMPRESS) $(FUTILITY) $(BINCFG) $(IFITTOOL) $(objutil)/supermicro/smcbiosinfo $(CSE_FPT) $(CSE_SERGER) $(AMDFWREAD)
###########################################################################
# Common recipes for all stages
###########################################################################
# loadaddr can determine the load address of a stage, which may be needed for
# platform-specific image headers (only works *after* the stage has been built)
loadaddr = $(shell $(OBJDUMP_$(1)) -p $(objcbfs)/$(1).debug | \
sed -ne '/LOAD/s/^.*vaddr 0x\([0-9a-fA-F]\{8\}\).*$$/0x\1/p')
# find-substr is required for stages like romstage_null and romstage_xip to
# eliminate the _* part of the string
find-substr = $(word 1,$(subst _, ,$(1)))
# find-class is used to identify the class from the name of the stage
# The input to this macro can be something like romstage.x or romstage.x.y
# find-class recursively strips off the suffixes to extract the exact class name
# e.g.: if romstage.x is provided to find-class, it will remove .x and return romstage
# if romstage.x.y is provided, it will first remove .y, call find-class with romstage.x
# and remove .x the next time and finally return romstage
find-class = $(if $(filter $(1),$(basename $(1))),$(if $(CC_$(1)), $(1), $(call find-substr,$(1))),$(call find-class,$(basename $(1))))
# Bootblocks are not CBFS stages. coreboot is currently expecting the bss to
# be cleared by the loader of the stage. For ARM SoCs that means one needs to
# include the bss section in the binary so the BootROM clears the bss on
# loading of the bootblock stage. Achieve this by marking the bss section
# loadable,allocatable, and data. Do the same for the .data section in case
# the linker marked it NOBITS automatically because there are only zeroes in it.
preserve-bss-flags := --set-section-flags .bss=load,alloc,data --set-section-flags .data=load,alloc,data
# For Intel TXT files in the CBFS needs to be marked as 'Initial Boot Block'.
# As CBFS attributes aren't cheap, only mark them if TXT is enabled.
ifeq ($(CONFIG_INTEL_TXT),y)
TXTIBB := --ibb
else
TXTIBB :=
endif
ifeq ($(CONFIG_COMPRESS_BOOTBLOCK),y)
$(objcbfs)/bootblock.lz4: $(objcbfs)/bootblock.elf $(objutil)/cbfstool/cbfs-compression-tool
@printf " LZ4 $(subst $(obj)/,,$(@))\n"
$(OBJCOPY_bootblock) $(preserve-bss-flags) $< $@.tmp
$(OBJCOPY_bootblock) -O binary $@.tmp
$(objutil)/cbfstool/cbfs-compression-tool rawcompress $@.tmp $@.tmp2 lz4
rm -f $@.tmp
mv $@.tmp2 $@
# Put assembled decompressor+bootblock into bootblock.raw.elf so that SoC
# Makefiles wrapping the bootblock in a header can always key off the same file.
$(objcbfs)/bootblock.raw.elf: $(objcbfs)/decompressor.elf
@printf " OBJCOPY $(notdir $(@))\n"
$(OBJCOPY_bootblock) $(preserve-bss-flags) $< $@
else # CONFIG_COMPRESS_BOOTBLOCK
$(objcbfs)/bootblock.raw.elf: $(objcbfs)/bootblock.elf
@printf " OBJCOPY $(notdir $(@))\n"
$(OBJCOPY_bootblock) $(preserve-bss-flags) $< $@
endif # CONFIG_COMPRESS_BOOTBLOCK
$(objcbfs)/bootblock.raw.bin: $(objcbfs)/bootblock.raw.elf
@printf " OBJCOPY $(notdir $(@))\n"
$(OBJCOPY_bootblock) -O binary $< $@
ifneq ($(CONFIG_HAVE_BOOTBLOCK),y)
$(objcbfs)/bootblock.bin:
dd if=/dev/zero of=$@ bs=64 count=1
endif
$(objcbfs)/%.bin: $(objcbfs)/%.raw.bin
cp $< $@
$(objcbfs)/%.map: $(objcbfs)/%.debug
$(eval class := $(call find-class,$(@F)))
$(NM_$(class)) -n $< | sort > $(basename $@).map
$(objcbfs)/%.elf: $(objcbfs)/%.debug $(objcbfs)/%.map
$(eval class := $(call find-class,$(@F)))
@printf " OBJCOPY $(subst $(obj)/,,$(@))\n"
cp $< $@.tmp
$(OBJCOPY_$(class)) --strip-debug $@.tmp
$(OBJCOPY_$(class)) --add-gnu-debuglink=$< $@.tmp
mv $@.tmp $@
###########################################################################
# Build the final rom image
###########################################################################
# extract_nth - Return a subsection of the $file string
#
# the input string looks like this:
# ./build/cbfs/fallback/romstage.elf|fallback/romstage|stage|none||64|--xip*-S*.car.data*-P*0x10000
#
# Sections:
# 1 - Path and name of file [FILENAME: Added to cbfs-files-y list variable]
# 2 - Name of file in cbfs [$(FILENAME)-file]
# 3 - File type: [$(FILENAME)-type]
# bootblock, cbfs header, stage, payload, optionrom, bootsplash, raw, vsa,
# mbi, microcode, fsp, mrc, cmos_default, cmos_layout, spd, mrc_cache,
# mma, efi, deleted, null
# 4 - Compression type [$(FILENAME)-compression]
# none, LZMA
# 5 - Base address [$(FILENAME)-position]
# 6 - Alignment [$(FILENAME)-align]
# 7 - cbfstool flags [$(FILENAME)-options]
#
# Input:
# $(1) = Section to extract
# $(2) = Input string
#
# Steps:
# 1) replace all '|' characters with the sequence '- -' within the full string, prepended and appended with the character '-'
# 2) extract the specified section from the string - this gets us the section surrounded by '-' characters
# 3) remove the leading and trailing '-' characters
# 4) replace all '*' characters with spaces
extract_nth=$(subst *,$(spc),$(patsubst -%-,%,$(word $(1), $(subst |,- -,-$(2)-))))
# regions-for-file - Returns a cbfstool regions parameter
# $(call regions-for-file,$(filename))
# returns "REGION1,REGION2,..."
#
# This is the default implementation. When using a boot strategy employing
# multiple CBFSes in fmap regions, override it.
regions-for-file ?= $(if $(value regions-for-file-$(1)), $(regions-for-file-$(1)), COREBOOT)
ifeq ($(CONFIG_CBFS_AUTOGEN_ATTRIBUTES),y)
cbfs-autogen-attributes=-g
endif
# cbfs-add-cmd-for-region
# $(call cbfs-add-cmd-for-region,file in extract_nth format,region name)
#
# CBFSTOOL_ADD_CMD_OPTIONS can be used by arch/SoC/mainboard to supply
# add commands with any additional arguments for cbfstool.
# Example: --ext-win-base <base> --ext-win-size <size>
define cbfs-add-cmd-for-region
$(CBFSTOOL) $@.tmp \
add$(if $(filter stage,$(call extract_nth,3,$(1))),-stage)$(if \
$(filter payload,$(call extract_nth,3,$(1))),-payload)$(if \
$(filter flat-binary,$(call extract_nth,3,$(1))),-flat-binary) \
-f $(call extract_nth,1,$(1)) \
-n $(call extract_nth,2,$(1)) \
$(if $(filter-out flat-binary payload stage,$(call \
extract_nth,3,$(1))),-t $(call extract_nth,3,$(1))) \
$(if $(call extract_nth,4,$(1)),-c $(call extract_nth,4,$(1))) \
$(cbfs-autogen-attributes) \
-r $(2) \
$(if $(call extract_nth,6,$(1)),-a $(call extract_nth,6,$(file)), \
$(if $(call extract_nth,5,$(file)),-b $(call extract_nth,5,$(file)))) \
$(call extract_nth,7,$(1)) \
$(CBFSTOOL_ADD_CMD_OPTIONS)
endef
# Empty line before endef is necessary so cbfs-add-cmd-for-region ends in a
# newline
# cbfs-add-cmd
# $(call cbfs-add-cmd,
# file in extract_nth format,
# region name,
# non-empty if file removal requested)
define cbfs-add-cmd
printf " CBFS $(call extract_nth,2,$(1))\n"
$(if $(3),-$(CBFSTOOL) $@.tmp remove -n $(call extract_nth,2,$(file)) 2>/dev/null)
$(call cbfs-add-cmd-for-region,$(1),$(2))
endef
# list of files to add (using their file system names, not CBFS names),
# for dependencies etc.
prebuilt-files = $(foreach file,$(cbfs-files), $(call extract_nth,1,$(file)))