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authorSascha Hauer <s.hauer@pengutronix.de>2018-06-07 06:00:52 -0700
committerSascha Hauer <s.hauer@pengutronix.de>2018-06-08 08:40:54 +0200
commit6b63e46e74705440ba3ebfa8cd2187f4d6a4f53f (patch)
treea31f54e99abffa3a6d20a2a52ca9241e3f5acac8 /firmware
parent711e3fbecea59b6e4383ad8a533bf9c1d06e33b3 (diff)
downloadbarebox-6b63e46e74705440ba3ebfa8cd2187f4d6a4f53f.tar.gz
Add builtin firmware support
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> [andrew.smirnov@gmail.com: Add dummy.o in case directory is empty] Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'firmware')
-rw-r--r--firmware/Kconfig7
-rw-r--r--firmware/Makefile54
2 files changed, 61 insertions, 0 deletions
diff --git a/firmware/Kconfig b/firmware/Kconfig
new file mode 100644
index 0000000..e0cc7ab
--- /dev/null
+++ b/firmware/Kconfig
@@ -0,0 +1,7 @@
+menu "Firmware files"
+
+config EXTRA_FIRMWARE_DIR
+ string "Firmware blobs root directory"
+ default "firmware"
+
+endmenu
diff --git a/firmware/Makefile b/firmware/Makefile
new file mode 100644
index 0000000..52984fd
--- /dev/null
+++ b/firmware/Makefile
@@ -0,0 +1,54 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# kbuild file for firmware/
+#
+
+# Create $(fwabs) from $(CONFIG_EXTRA_FIRMWARE_DIR) -- if it doesn't have a
+# leading /, it's relative to $(srctree).
+fwdir := $(subst $(quote),,$(CONFIG_EXTRA_FIRMWARE_DIR))
+fwabs := $(addprefix $(srctree)/,$(filter-out /%,$(fwdir)))$(filter /%,$(fwdir))
+
+fw-external-y := $(firmware-y)
+
+quiet_cmd_fwbin = MK_FW $@
+ cmd_fwbin = FWNAME="$(patsubst firmware/%.gen.S,%,$@)"; \
+ FWSTR="$(subst /,_,$(subst .,_,$(subst -,_,$(patsubst \
+ firmware/%.gen.S,%,$@))))"; \
+ ASM_WORD=$(if $(CONFIG_64BIT),.quad,.long); \
+ ASM_ALIGN=$(if $(CONFIG_64BIT),3,2); \
+ PROGBITS=$(if $(CONFIG_ARM),%,@)progbits; \
+ echo "/* Generated by firmware/Makefile */" > $@;\
+ echo " .section .rodata.$${FWSTR}" >>$@;\
+ echo " .p2align $${ASM_ALIGN}" >>$@;\
+ echo ".global _fw_$${FWSTR}_start" >>$@;\
+ echo "_fw_$${FWSTR}_start:" >>$@;\
+ echo " .incbin \"$(2)\"" >>$@;\
+ echo ".global _fw_$${FWSTR}_end" >>$@;\
+ echo "_fw_$${FWSTR}_end:" >>$@;
+
+# One of these files will change, or come into existence, whenever
+# the configuration changes between 32-bit and 64-bit. The .S files
+# need to change when that happens.
+wordsize_deps := $(wildcard include/config/64bit.h include/config/32bit.h)
+
+$(patsubst %,$(obj)/%.gen.S, $(fw-external-y)): %: $(wordsize_deps) \
+ include/config/extra/firmware/dir.h
+ $(call cmd,fwbin,$(fwabs)/$(patsubst $(obj)/%.gen.S,%,$@))
+
+# The .o files depend on the binaries directly; the .S files don't.
+$(patsubst %,$(obj)/%.gen.o, $(fw-external-y)): $(obj)/%.gen.o: $(fwdir)/%
+
+obj-pbl-y += $(patsubst %,%.gen.o, $(fw-external-y))
+
+ifeq ($(KBUILD_SRC),)
+# Makefile.build only creates subdirectories for O= builds, but external
+# firmware might live outside the kernel source tree
+_dummy := $(foreach d,$(addprefix $(obj)/,$(dir $(fw-external-y))), $(shell [ -d $(d) ] || mkdir -p $(d)))
+endif
+
+targets := $(patsubst $(obj)/%,%, \
+ $(shell find $(obj) -name \*.gen.S 2>/dev/null))
+
+# just to build a built-in.o. Otherwise compilation fails when no devicetree is
+# created.
+obj- += dummy.o