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For modifying a factory image:

  1. Find the PARTs
  2. Extract them
  3. unsquash: unsquashfs -d image/ squashfs.bin
  4. Make the changes.
  5. squash: ~/code/commotion-openwrt/commotion-openwrt/openwrt/staging_dir/host/bin/mksquashfs4 image/ squashfs-made.bin -nopad -noappend -root-owned -comp xz -Xpreset 9 -Xe -Xlc 0 -Xlp 2 -Xpb 2 -b 256k
  6. pad: ~/code/commotion-openwrt/commotion-openwrt/openwrt/staging_dir/host/bin/padjffs2 squashfs-made.bin 64
  7. mkfwimage: ~/code/commotion-openwrt/commotion-openwrt/openwrt/staging_dir/host/bin/mkfwimage -B XM -k kernel.img -r squashfs-made.bin -v XM.ar7240.v6.0.0-OpenWrt-r36682 -o openwrt-ar71xx-generic-ubnt-nano-m-squashfs-factory-DR2-tn.bin

For modifying a sysugrade image:

  1. Extract 0-1048576 (bytes): that's the kernel
  2. Extract the rest: that's the squashfs (follow instructions above for unsquashing and resquashing.)
  3. Put them back together with ( dd if=vmlinux bs=1048576 conv=sync; dd if=squashfs-made.bin ) > openwrt-ar71xx-generic-ubnt-bullet-m-squashfs-sysupgrade-DR2-custom.bin
development_resources/router/modifying_.bin_files_by_hand.txt · Last modified: 2013/12/02 17:31 (external edit)
 
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