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ramips: add comments for image/Makefile.

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Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

SVN-Revision: 42991
This commit is contained in:
John Crispin 2014-10-20 06:29:51 +00:00
parent 182d63bc40
commit 5c33e9565b
1 changed files with 20 additions and 1 deletions
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21
target/linux/ramips/image/Makefile
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@ -56,7 +56,9 @@ endef
#
# The real magic happens inside these templates
#
# $(1), compression method
# $(2), filename of image data
# $(3), output filename
define MkImage
$(eval imagename=$(if $(4),$(4),MIPS OpenWrt Linux-$(LINUX_VERSION)))
-mkimage -A mips -O linux -T kernel -C $(1) $(call kernel_entry)\
@ -79,6 +81,9 @@ define MkImageSysupgrade/squashfs
fi
endef
# $(1), lowercase board name like "mt7620a_v22sg"
# $(2), DTS filename without .dts extension
# $(3), optional filename suffix, e.g. "-initramfs"
define PatchKernelLzmaDtb
cp $(KDIR)/vmlinux$(3) $(KDIR)/vmlinux-$(1)$(3)
$(LINUX_DIR)/scripts/dtc/dtc -O dtb -o $(KDIR)/$(2).dtb ../dts/$(2).dts
@ -86,16 +91,29 @@ define PatchKernelLzmaDtb
$(call CompressLzma,$(KDIR)/vmlinux-$(1)$(3),$(KDIR)/vmlinux-$(1)$(3).bin.lzma)
endef
# $(1), lowercase board name
# $(2), DTS filename without .dts extension
# $(3), ih_name field of uImage header
# $(4), optional filename suffix, e.g. "-initramfs"
define MkImageLzmaDtb
$(call PatchKernelLzmaDtb,$(1),$(2),$(4))
$(call MkImage,lzma,$(KDIR)/vmlinux-$(1)$(4).bin.lzma,$(KDIR)/vmlinux-$(1)$(4).uImage,$(3))
endef
# $(1), Rootfs type, e.g. squashfs
# $(2), lowercase board name
# $(3), DTS filename without .dts extension
# $(4), maximum size of sysupgrade image
# $(5), uImage header's ih_name field
define BuildFirmware/OF
$(call MkImageLzmaDtb,$(2),$(3),$(5))
$(call MkImageSysupgrade/$(1),$(1),$(2),$(4),$(6))
endef
# $(1), squashfs/initramfs
# $(2), lowercase board name
# $(3), DTS filename without .dts extension
# $(4), ih_name field of uImage header
define BuildFirmware/OF/initramfs
$(call MkImageLzmaDtb,$(2),$(3),$(4),-initramfs)
$(CP) $(KDIR)/vmlinux-$(2)-initramfs.uImage $(call imgname,$(1),$(2))-uImage.bin
@ -116,6 +134,7 @@ BuildFirmware/Default4M/initramfs=$(call BuildFirmware/OF/initramfs,$(1),$(2),$(
# $(1) = squashfs/initramfs
# $(2) = lowercase board name
# $(3) = dts file
# $(4) = uImage header name field
ralink_default_fw_size_8M=8060928
BuildFirmware/Default8M/squashfs=$(call BuildFirmware/OF,$(1),$(2),$(3),$(ralink_default_fw_size_8M),$(4))
BuildFirmware/Default8M/initramfs=$(call BuildFirmware/OF/initramfs,$(1),$(2),$(3),$(4))