Hello, I'm wondering if there is a good description of the firmware image format used by M-series Ubiquiti devices? How file- and part headers are to be interpreted/created?
Using Ubiquiti's fwsplit utility, I can get the kernel and rootfs parts out of the OpenWrt -factory.bin image and simply concatenating them results in the -sysupgrade.bin image. Of course, fwsplit.c is available in source, so it can be reverse-engineered, but I guess documentation is available somewhere. In general, it would be nice not to have the distinction between -factory.bin and -sysupgrade.bin images. As I understand the latter are just stripped-down versions of the former, with some headers removed (i.e. a simple concatenation of the parts), when the kernel part is known to be exactly one megabyte and the rootfs part three megabytes. Cheers, -- Daniel
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