2 # kbuild file for firmware/
5 # Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
6 # leading /, it's relative to $(srctree).
7 fwdir
:= $(subst ",,$(CONFIG_EXTRA_FIRMWARE_DIR))
8 fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
10 fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE
))
12 # There are three cases to care about:
13 # 1. Building kernel with CONFIG_FIRMWARE_IN_KERNEL=y -- $(fw-shipped-y) should
14 # include the firmware files to include, according to .config
15 # 2. 'make modules_install', which will install firmware for modules, and
16 # _also_ for the in-kernel drivers when CONFIG_FIRMWARE_IN_KERNEL=n
17 # 3. 'make firmware_install', which installs all firmware, unconditionally.
19 # For the former two cases we want $(fw-shipped-y) and $(fw-shipped-m) to be
20 # accurate. In the latter case it doesn't matter -- it'll use $(fw-shipped-all).
21 # But be aware that the config file might not be included at all.
24 fw-shipped-all
:= $(fw-shipped-y
) $(fw-shipped-m
) $(fw-shipped-
)
26 # Directories which we _might_ need to create, so we have a rule for them.
27 firmware-dirs
:= $(sort $(patsubst %,$(objtree
)/$(obj
)/%/,$(dir $(fw-external-y
) $(fw-shipped-all
))))
29 quiet_cmd_mkdir
= MKDIR
$(patsubst $(objtree
)/%,%,$@
)
30 cmd_mkdir
= mkdir
-p
$@
32 quiet_cmd_ihex
= IHEX
$@
33 cmd_ihex
= $(OBJCOPY
) -Iihex
-Obinary
$< $@
35 quiet_cmd_ihex2fw
= IHEX2FW
$@
36 cmd_ihex2fw
= $(objtree
)/$(obj
)/ihex2fw
$< $@
38 quiet_cmd_fwbin
= MK_FW
$@
39 cmd_fwbin
= FWNAME
="$(patsubst firmware/%.gen.S,%,$@)"; \
40 FWSTR
="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
41 firmware/%.gen.S,%,$@))))"; \
42 ASM_WORD
=$(if
$(CONFIG_64BIT
),.quad
,.long
); \
43 ASM_ALIGN
=$(if
$(CONFIG_64BIT
),3,2); \
44 PROGBITS
=$(if
$(CONFIG_ARM
),%,@
)progbits
; \
45 echo
"/* Generated by firmware/Makefile */" > $@
;\
46 echo
" .section .rodata" >>$@
;\
47 echo
" .p2align $${ASM_ALIGN}" >>$@
;\
48 echo
"_fw_$${FWSTR}_bin:" >>$@
;\
49 echo
" .incbin \"$(2)\"" >>$@
;\
50 echo
"_fw_end:" >>$@
;\
51 echo
" .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@
;\
52 echo
" .p2align $${ASM_ALIGN}" >>$@
;\
53 echo
"_fw_$${FWSTR}_name:" >>$@
;\
54 echo
" .string \"$$FWNAME\"" >>$@
;\
55 echo
" .section .builtin_fw,\"a\",$${PROGBITS}" >>$@
;\
56 echo
" .p2align $${ASM_ALIGN}" >>$@
;\
57 echo
" $${ASM_WORD} _fw_$${FWSTR}_name" >>$@
;\
58 echo
" $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@
;\
59 echo
" $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@
;
61 # One of these files will change, or come into existence, whenever
62 # the configuration changes between 32-bit and 64-bit. The .S files
63 # need to change when that happens.
64 wordsize_deps
:= $(wildcard include/config
/64bit.h
include/config
/32bit.h \
65 include/config
/ppc32.h
include/config
/ppc64.h \
66 include/config
/superh32.h
include/config
/superh64.h \
67 include/config
/x86_32.h
include/config
/x86_64.h
)
69 # Workaround for make < 3.81, where .SECONDEXPANSION doesn't work.
70 # It'll end up depending on these targets, so make them a PHONY rule which
71 # depends on _all_ the directories in $(firmware-dirs), and it'll work out OK.
72 PHONY
+= $(objtree
)/$$(%) $(objtree
)/$(obj
)/$$(%)
73 $(objtree
)/$$(%) $(objtree
)/$(obj
)/$$(%): $(firmware-dirs
)
76 # For the $$(dir %) trick, where we need % to be expanded first.
79 $(patsubst %,$(obj
)/%.gen.S
, $(fw-shipped-y
)): %: $(wordsize_deps
) \
80 |
$(objtree
)/$$(dir %)
81 $(call cmd
,fwbin
,$(patsubst %.gen.S
,%,$@
))
82 $(patsubst %,$(obj
)/%.gen.S
, $(fw-external-y
)): %: $(wordsize_deps
) \
83 include/config
/builtin
/firmware
/dir.h |
$(objtree
)/$$(dir %)
84 $(call cmd
,fwbin
,$(fwabs
)/$(patsubst $(obj
)/%.gen.S
,%,$@
))
86 # The .o files depend on the binaries directly; the .S files don't.
87 $(patsubst %,$(obj
)/%.gen.o
, $(fw-shipped-y
)): %.gen.o
: %
88 $(patsubst %,$(obj
)/%.gen.o
, $(fw-external-y
)): $(obj
)/%.gen.o
: $(fwdir
)/%
90 # .ihex is used just as a simple way to hold binary files in a source tree
91 # where binaries are frowned upon. They are directly converted with objcopy.
92 $(obj
)/%: $(obj
)/%.ihex |
$(objtree
)/$(obj
)/$$(dir %)
95 # .HEX is also Intel HEX, but where the offset and length in each record
96 # is actually meaningful, because the firmware has to be loaded in a certain
97 # order rather than as a single binary blob. Thus, we convert them into our
98 # more compact binary representation of ihex records (<linux/ihex.h>)
99 $(obj
)/%.fw
: $(obj
)/%.HEX
$(obj
)/ihex2fw |
$(objtree
)/$(obj
)/$$(dir %)
105 obj-y
+= $(patsubst %,%.gen.o
, $(fw-external-y
))
106 obj-
$(CONFIG_FIRMWARE_IN_KERNEL
) += $(patsubst %,%.gen.o
, $(fw-shipped-y
))
108 # Remove .S files and binaries created from ihex
109 # (during 'make clean' .config isn't included so they're all in $(fw-shipped-))
110 targets
:= $(fw-shipped-
) $(patsubst $(obj
)/%,%, \
111 $(shell find
$(obj
) -name \
*.gen.S
2>/dev
/null
))
113 # Without this, built-in.o won't be created when it's empty, and the
114 # final vmlinux link will fail.
117 hostprogs-y
:= ihex2fw