Commonly supplied by cable television providers for the purpose of receiving the respective cable TV signals. Often include a hard drive, which makes them similar to DVRs (being a commercial product for recording TV onto drives). Usually runs off MIPS, but ARM is possible.

Linux 3.3 with Broadcom blobs hanging off it like tumors → BusyBox and friends → “X1 Platform” (Giant horrible JR2E app)

Good luck hacking this for anything. They don’t even publicly dispel the actual kernel version they use, only a custom number. However, it still does run Linux.

https://www.reddit.com/r/linux/comments/7j73mg/comcast_cable_boxes_run_linux/