I was shopping through a local Goodwill, not looking for anything in particular, I just saw one that I hadn't visit before and decided that today was as good of a day as any to give it a visit. I didn't found much, just a bunch of clothes, VHS tapes and tabletop games. But on my way to the electronics section I saw and old router for around four dollars, and I decided to pick it up just to see what I could do with it.
It turned out to be a Starbridge Networking Lynx 210 from 2005, running a TI TNETD7300 SoC with 2 MB of flash and 8 MB of RAM. Unsurprisingly, it has no OpenWrt support or anything, but it did had a set of UART pins already soldered on its board, and after a bit of digging, I found out they were running at 38400 bauds (odd). It looks like it's rocking the "Adam2" bootloader (which I expected after reading the OpenWrt wiki on its CPU) so I might be able to make it run some code from RAM. And while a J-Link might (will) come in handy, I don't have one of those yet, but there's probably plenty of things that I can do with this puppy in the meantime.