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Subject[PATCH 2/3] firmware: Add CONFIG_BUILTIN_FIRMWARE option
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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.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
---
Makefile | 2 +-
drivers/base/Kconfig | 12 ++++++++++++
firmware/Makefile | 23 +++++++++++++++++++++++
3 files changed, 36 insertions(+), 1 deletions(-)
create mode 100644 firmware/Makefile
diff --git a/Makefile b/Makefile
index 20b3235..ac2ab7e 100644
--- a/Makefile
+++ b/Makefile
@@ -450,7 +450,7 @@ scripts: scripts_basic include/config/auto.conf

# Objects we will link into vmlinux / subdirs we need to visit
init-y := init/
-drivers-y := drivers/ sound/
+drivers-y := drivers/ sound/ firmware/
net-y := net/
libs-y := lib/
core-y := usr/
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index d7da109..687f097 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -34,6 +34,18 @@ config FW_LOADER
require userspace firmware loading support, but a module built outside
the kernel tree does.

+config BUILTIN_FIRMWARE
+ string "Firmware blobs to build into the kernel binary"
+ depends on FW_LOADER
+ help
+ This option allows firmware to be built into the kernel, for the cases
+ where the user either cannot or doesn't want to provide it from
+ userspace at runtime (for example, when the firmware in question is
+ required for accessing the boot device, and the user doesn't want to
+ use an initrd). Multiple files should be separated with spaces, and
+ the required files should exist under the firmware/ directory in
+ the source tree.
+
config DEBUG_DRIVER
bool "Driver Core verbose debug messages"
depends on DEBUG_KERNEL
diff --git a/firmware/Makefile b/firmware/Makefile
new file mode 100644
index 0000000..184b8ef
--- /dev/null
+++ b/firmware/Makefile
@@ -0,0 +1,23 @@
+#
+# kbuild file for firmware/
+#
+
+FIRMWARE_BINS := $(subst ",,$(CONFIG_BUILTIN_FIRMWARE))
+FIRMWARE_OBJS := $(patsubst %,%.o, $(FIRMWARE_BINS))
+FIRMWARE_SRCS := $(patsubst %,$(obj)/%.c, $(FIRMWARE_BINS))
+
+
+quiet_cmd_fwbin = MK_FW $@
+ cmd_fwbin = echo '/* File automatically generated */' > $@ ; \
+ echo '\#include <linux/firmware.h>' >> $@ ; \
+ echo 'static const unsigned char fw[] = {' >> $@ ; \
+ od -t x1 -A none -v $(srctree)/$(patsubst %.c,%,$@) | \
+ sed -e 's/ /, 0x/g' -e 's/^,//' -e 's/$$/,/' >> $@ ; \
+ echo '};' >> $@ ; \
+ echo 'DECLARE_BUILTIN_FIRMWARE("$(patsubst firmware/%.c,%,$@)",fw);' >> $@
+
+$(FIRMWARE_SRCS): $(obj)/%.c: $(srctree)/$(obj)/%
+ $(call cmd,fwbin)
+
+obj-y := $(FIRMWARE_OBJS)
+
--
1.5.4.5

--
dwmw2



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