I'm pretty certain the rgu files are merged into the default.hv and user.hv files. At least all the ones i've verified by hand were. The batch file in the kitchen implementation dumps all the rgu files before running the buildimgfs so someone must have thought they were extraneous. I kind of had this thought that maybe there were there to hold user type settings, but since they're being copied into the ROM, this doesn't seem to make much sense.
As far as the dsm files go, I'm sort of thinking that they have something to do with application signing/certificates. I'm kind of thinking this is adopted from other devices and haven't actually seen where they are necessary, but there's very little information to be had on this subject.
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