Indeed. From what I understand from reading the LKML, embedded in the firmware that you can download is a cramfs image. As long as they don't do something silly like have the bootloader only run signed software, then we could just make a new set of files, make a cramfs out of them, and reflash.
Yes, and no. I suspect that the box is severely limited in RAM and ROM. In which case you won't be able to add much. It appears to be a MIPS processor so you'll need an appropriate dev environment with cross compilers (I think). The Locustworld crew went down this route but eventually gave up and now use hardware with an Intel compatible motherboard. Of course, the WRT54G is another generation on and maybe they're being more generous with the RAM and ROM.
There's something interesting in here though. It's currently impossible to get enough information out of Broadcom to write Linux drivers. But this box contains Broadcom Linux drivers compiled for MIPS. Is it feasible to de-compile and hence reverse engineer them?
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