can beaglebone black run entirely on free software?

[rne]

I had a particular beaglebone black user case in mind. I made a new post on the matter.

can a beaglebone black replace a rpi zero w in an open printer?

Free software is software you can use, share, modify and redistribute. Open printer plans to use a rpi zero w. The rpi zero w requires non free software in order to work. The question is, can you replace the rpi zero w with a beaglebone black such that the beaglebone black runs a free software gnu linux system? It appears the open printer will rely on cups software, which has a free software license. Thanks.