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firmware: Add CONFIG_EXTRA_FIRMWARE option
This allows arbitrary firmware files to be included in the static kernel where the firmware loader can find them without requiring userspace to be alive. (Updated and CONFIG_EXTRA_FIRMWARE_DIR added with lots of help from Johannes Berg). Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
This commit is contained in:
David Woodhouse
David Woodhouse
parent
5658c76944
commit
4d2acfbfdf
3 changed files with 128 additions and 1 deletions
2
Makefile
2
Makefile
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@ -450,7 +450,7 @@ scripts: scripts_basic include/config/auto.conf
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# Objects we will link into vmlinux / subdirs we need to visit
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init-y := init/
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drivers-y := drivers/ sound/
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drivers-y := drivers/ sound/ firmware/
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net-y := net/
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libs-y := lib/
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core-y := usr/
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@ -34,6 +34,45 @@ config FW_LOADER
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require userspace firmware loading support, but a module built outside
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the kernel tree does.
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config EXTRA_FIRMWARE
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string "External firmware blobs to build into the kernel binary"
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depends on FW_LOADER
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help
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This option allows firmware to be built into the kernel, for the
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cases where the user either cannot or doesn't want to provide it from
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userspace at runtime (for example, when the firmware in question is
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required for accessing the boot device, and the user doesn't want to
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use an initrd).
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This option is a string, and takes the (space-separated) names of the
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firmware files -- the same names which appear in MODULE_FIRMWARE()
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and request_firmware() in the source. These files should exist under
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the directory specified by the EXTRA_FIRMWARE_DIR option, which is
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by default the firmware/ subdirectory of the kernel source tree.
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So, for example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin",
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copy the usb8388.bin file into the firmware/ directory, and build the
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kernel. Then any request_firmware("usb8388.bin") will be
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satisfied internally without needing to call out to userspace.
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WARNING: If you include additional firmware files into your binary
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kernel image which are not available under the terms of the GPL,
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then it may be a violation of the GPL to distribute the resulting
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image -- since it combines both GPL and non-GPL work. You should
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consult a lawyer of your own before distributing such an image.
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config EXTRA_FIRMWARE_DIR
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string "Firmware blobs root directory"
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depends on EXTRA_FIRMWARE != ""
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default "firmware"
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help
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This option controls the directory in which the kernel build system
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looks for the firmware files listed in the EXTRA_FIRMWARE option.
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The default is the firmware/ directory in the kernel source tree,
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but by changing this option you can point it elsewhere, such as
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the /lib/firmware/ directory or another separate directory
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containing firmware files.
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config DEBUG_DRIVER
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bool "Driver Core verbose debug messages"
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depends on DEBUG_KERNEL
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88
firmware/Makefile
Normal file
88
firmware/Makefile
Normal file
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@ -0,0 +1,88 @@
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#
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# kbuild file for firmware/
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#
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# Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
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# leading /, it's relative to $(srctree).
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fwdir := $(subst ",,$(CONFIG_EXTRA_FIRMWARE_DIR))
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fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
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fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE))
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firmware-y := $(fw-external-y) $(fw-shipped-y)
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firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(firmware-y) $(fw-shipped-))))
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quiet_cmd_mkdir = MKDIR $(patsubst $(objtree)/%,%,$@)
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cmd_mkdir = mkdir -p $@
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quiet_cmd_ihex = IHEX $@
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cmd_ihex = $(OBJCOPY) -Iihex -Obinary $< $@
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quiet_cmd_fwbin = MK_FW $@
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cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \
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FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
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firmware/%.gen.S,%,$@))))"; \
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ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \
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ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \
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PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \
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echo "/* Generated by firmware/Makefile */" > $@;\
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echo " .section .rodata" >>$@;\
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echo " .p2align $${ASM_ALIGN}" >>$@;\
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echo "_fw_$${FWSTR}_bin:" >>$@;\
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echo " .incbin \"$(2)\"" >>$@;\
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echo "_fw_end:" >>$@;\
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echo " .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\
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echo " .p2align $${ASM_ALIGN}" >>$@;\
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echo "_fw_$${FWSTR}_name:" >>$@;\
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echo " .string \"$$FWNAME\"" >>$@;\
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echo " .section .builtin_fw,\"a\",$${PROGBITS}" >>$@;\
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echo " .p2align $${ASM_ALIGN}" >>$@;\
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echo " $${ASM_WORD} _fw_$${FWSTR}_name" >>$@;\
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echo " $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@;\
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echo " $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@;
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# One of these files will change, or come into existence, whenever
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# the configuration changes between 32-bit and 64-bit. The .S files
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# need to change when that happens.
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wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \
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include/config/ppc32.h include/config/ppc64.h \
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include/config/superh32.h include/config/superh64.h \
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include/config/x86_32.h include/config/x86_64.h)
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# Workaround for make < 3.81, where .SECONDEXPANSION doesn't work.
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# It'll end up depending on these targets, so make them a PHONY rule which
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# depends on _all_ the directories in $(firmware-dirs), and it'll work out OK.
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PHONY += $(objtree)/$$(%) $(objtree)/$(obj)/$$(%)
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$(objtree)/$$(%) $(objtree)/$(obj)/$$(%): $(firmware-dirs)
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@true
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# For the $$(dir %) trick, where we need % to be expanded first.
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.SECONDEXPANSION:
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$(patsubst %,$(obj)/%.gen.S, $(fw-shipped-y)): %: $(wordsize_deps) \
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| $(objtree)/$$(dir %)
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$(call cmd,fwbin,$(patsubst %.gen.S,%,$@))
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$(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
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include/config/builtin/firmware/dir.h | $(objtree)/$$(dir %)
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$(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
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# The .o files depend on the binaries directly; the .S files don't.
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$(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: %
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$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
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$(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %)
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$(call cmd,ihex)
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$(firmware-dirs):
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$(call cmd,mkdir)
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obj-y := $(patsubst %,%.gen.o, $(firmware-y))
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# Remove .S files and binaries created from ihex
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# (during 'make clean' .config isn't included so they're all in $(fw-shipped-))
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targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \
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$(shell find $(obj) -name \*.gen.S 2>/dev/null))
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# Without this, built-in.o won't be created when it's empty, and the
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# final vmlinux link will fail.
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obj-n := dummy
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