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authorDavid Woodhouse <dwmw2@infradead.org>2008-05-23 08:58:12 -0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2008-07-10 09:30:39 -0400
commit4d2acfbfdf68257e846aaa355edd10fc35ba0feb (patch)
tree6ab49a7d46036fffb0f4588595ede7abca11a51a /firmware/Makefile
parent5658c769443d543728b6c5c673dffc2df8676317 (diff)
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>
Diffstat (limited to 'firmware/Makefile')
-rw-r--r--firmware/Makefile88
1 files changed, 88 insertions, 0 deletions
diff --git a/firmware/Makefile b/firmware/Makefile
new file mode 100644
index 00000000000..e69461f9362
--- /dev/null
+++ b/firmware/Makefile
@@ -0,0 +1,88 @@
1#
2# kbuild file for firmware/
3#
4
5# Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
6# leading /, it's relative to $(srctree).
7fwdir := $(subst ",,$(CONFIG_EXTRA_FIRMWARE_DIR))
8fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
9
10fw-external-y := $(subst ",,$(CONFIG_EXTRA_FIRMWARE))
11
12firmware-y := $(fw-external-y) $(fw-shipped-y)
13firmware-dirs := $(sort $(patsubst %,$(objtree)/$(obj)/%/,$(dir $(firmware-y) $(fw-shipped-))))
14
15quiet_cmd_mkdir = MKDIR $(patsubst $(objtree)/%,%,$@)
16 cmd_mkdir = mkdir -p $@
17
18quiet_cmd_ihex = IHEX $@
19 cmd_ihex = $(OBJCOPY) -Iihex -Obinary $< $@
20
21quiet_cmd_fwbin = MK_FW $@
22 cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \
23 FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
24 firmware/%.gen.S,%,$@))))"; \
25 ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \
26 ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \
27 PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \
28 echo "/* Generated by firmware/Makefile */" > $@;\
29 echo " .section .rodata" >>$@;\
30 echo " .p2align $${ASM_ALIGN}" >>$@;\
31 echo "_fw_$${FWSTR}_bin:" >>$@;\
32 echo " .incbin \"$(2)\"" >>$@;\
33 echo "_fw_end:" >>$@;\
34 echo " .section .rodata.str,\"aMS\",$${PROGBITS},1" >>$@;\
35 echo " .p2align $${ASM_ALIGN}" >>$@;\
36 echo "_fw_$${FWSTR}_name:" >>$@;\
37 echo " .string \"$$FWNAME\"" >>$@;\
38 echo " .section .builtin_fw,\"a\",$${PROGBITS}" >>$@;\
39 echo " .p2align $${ASM_ALIGN}" >>$@;\
40 echo " $${ASM_WORD} _fw_$${FWSTR}_name" >>$@;\
41 echo " $${ASM_WORD} _fw_$${FWSTR}_bin" >>$@;\
42 echo " $${ASM_WORD} _fw_end - _fw_$${FWSTR}_bin" >>$@;
43
44# One of these files will change, or come into existence, whenever
45# the configuration changes between 32-bit and 64-bit. The .S files
46# need to change when that happens.
47wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h \
48 include/config/ppc32.h include/config/ppc64.h \
49 include/config/superh32.h include/config/superh64.h \
50 include/config/x86_32.h include/config/x86_64.h)
51
52# Workaround for make < 3.81, where .SECONDEXPANSION doesn't work.
53# It'll end up depending on these targets, so make them a PHONY rule which
54# depends on _all_ the directories in $(firmware-dirs), and it'll work out OK.
55PHONY += $(objtree)/$$(%) $(objtree)/$(obj)/$$(%)
56$(objtree)/$$(%) $(objtree)/$(obj)/$$(%): $(firmware-dirs)
57 @true
58
59# For the $$(dir %) trick, where we need % to be expanded first.
60.SECONDEXPANSION:
61
62$(patsubst %,$(obj)/%.gen.S, $(fw-shipped-y)): %: $(wordsize_deps) \
63 | $(objtree)/$$(dir %)
64 $(call cmd,fwbin,$(patsubst %.gen.S,%,$@))
65$(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
66 include/config/builtin/firmware/dir.h | $(objtree)/$$(dir %)
67 $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
68
69# The .o files depend on the binaries directly; the .S files don't.
70$(patsubst %,$(obj)/%.gen.o, $(fw-shipped-y)): %.gen.o: %
71$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
72
73$(obj)/%: $(obj)/%.ihex | $(objtree)/$(obj)/$$(dir %)
74 $(call cmd,ihex)
75
76$(firmware-dirs):
77 $(call cmd,mkdir)
78
79obj-y := $(patsubst %,%.gen.o, $(firmware-y))
80
81# Remove .S files and binaries created from ihex
82# (during 'make clean' .config isn't included so they're all in $(fw-shipped-))
83targets := $(fw-shipped-) $(patsubst $(obj)/%,%, \
84 $(shell find $(obj) -name \*.gen.S 2>/dev/null))
85
86# Without this, built-in.o won't be created when it's empty, and the
87# final vmlinux link will fail.
88obj-n := dummy