My upgrader.c program can be used to break up .upgrade files into their component blobs, each of which can then be identified by the Linux "file" command for further breakdown.

I've updated my bigdisk builder page to now include snapshots of the build directories/tools I use to respin the .upgrade files.

Things are pretty simple. There is an "hda5" subdirectory, which contains everything you want to put into the root filesystem. There is also a "_proc_empeg_kernel" symlink, which should point at whatever kernel zImage file you want.

Then just run the included "./respin_upgrade.sh" to update things.

Cheers