openwrt - squashfs-sysupgrade.bin 的生成过程

squashfs-sysupgrade.bin 生成过程图

路径变量

$(KERNEL_BUILD_DIR)=”/home/sam/Projects/openwrt-mt7620n/build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7620n/linux-3.14.18“

$(KDIR)=“/home/sam/Projects/openwrt-mt7620n/build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/linux-ramips_mt7620n”

$(STAGING_DIR_HOST)=“/home/sam/Projects/openwrt-mt7620n/staging_dir/host”

图中标有序号的步骤，执行命令如下：

mipsel-openwrt-linux-uclibc-objcopy -O binary -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S $(KERNEL_BUILD_DIR)/vmlinux $(KDIR)/vmlinux

mipsel-openwrt-linux-uclibc-objcopy -R .reginfo -R .notes -R .note -R .comment -R .mdebug -R .note.gnu.build-id -S $(KERNEL_BUILD_DIR)/vmlinux $(KDIR)/vmlinux.elf

$(STAGING_DIR_HOST)/bin/lzma e $(KDIR)/vmlinux -lc1 -lp2 -pb2 $(KDIR)/vmlinux.bin.lzma

mkimage -A mips -O linux -T kernel -C lzma -a 0x80000000 -e 0x80000000 -n "MIPS OpenWrt Linux-3.14.18" -d $(KDIR)/vmlinux.bin.lzma $(KDIR)/uImage.lzma
Image Name:   MIPS OpenWrt Linux-3.14.18
Created:      Sat Sep 20 16:28:05 2014
Image Type:   MIPS Linux Kernel Image (lzma compressed)
Data Size:    1051164 Bytes = 1026.53 kB = 1.00 MB
Load Address: 80000000
Entry Point:  80000000

$(STAGING_DIR_HOST)/bin/mksquashfs4 /home/sam/Projects/openwrt-mt7620n/build_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/root-ramips $(KDIR)/root.squashfs -nopad -noappend -root-owned -comp xz -Xpreset 9 -Xe -Xlc 0 -Xlp 2 -Xpb 2  -b 256k -p '/dev d 755 0 0' -p '/dev/console c 600 0 0 5 1' -processors 1

dd if=$(KDIR)/root.squashfs of=/home/sam/Projects/openwrt-mt7620n/bin/ramips/openwrt-ramips-mt7620n-root.squashfs bs=128k conv=sync

$(KERNEL_BUILD_DIR)/scripts/dtc/dtc -O dtb -o $(KDIR)/WRTNODE.dtb ../dts/WRTNODE.dts

$(STAGING_DIR_HOST)/bin/patch-dtb $(KDIR)/vmlinux-wrtnode $(KDIR)/WRTNODE.dtb

$(STAGING_DIR_HOST)/bin/lzma e $(KDIR)/vmlinux-wrtnode -lc1 -lp2 -pb2 $(KDIR)/vmlinux-wrtnode.bin.lzma

mkimage -A mips -O linux -T kernel -C lzma -a 0x80000000 -e 0x80000000 -n "MIPS OpenWrt Linux-3.14.18" -d $(KDIR)/vmlinux-wrtnode.bin.lzma $(KDIR)/vmlinux-wrtnode.uImage

cat $(KDIR)/vmlinux-wrtnode.uImage $(KDIR)/root.squashfs > $(KDIR)/openwrt-ramips-mt7620n-wrtnode-squashfs-sysupgrade.bin

$(STAGING_DIR_HOST)/bin/padjffs2 $(KDIR)/openwrt-ramips-mt7620n-wrtnode-squashfs-sysupgrade.bin 4 8 16 64 128 256
Image Name:   MIPS OpenWrt Linux-3.14.18
Created:      Sat Sep 20 16:28:15 2014
Image Type:   MIPS Linux Kernel Image (lzma compressed)
Data Size:    1052354 Bytes = 1027.69 kB = 1.00 MB
Load Address: 80000000
Entry Point:  80000000