I don't think there's an upstream Ardour build for anything other than x86 and amd64, but it exists in the Debian repositories, so most Debian-based distros should have some version of it or other (although typically not the latest) on any supported platform.
-Russ
No, there is no upstream build for ARMxx from Ardour.org.
I simply upgraded to the armhf port of Debian testing from Armbian on the BananaPi. Debian testing comes with Ardour5.12 (the most recent version) and no outdated crap. It also runs the RaspberryPi version of X32-Edit.
But forget the/any RaspberryPi for recording more than a handful of tracks. Those boards are all crippled in terms of IO, as everything has to go through the single USB port of the SOC. Thats why I went with the Bananapi, which has USB, network and a quite fast, real SATA interface directly connected to the processor bus.
There is also another recording solution based on the BananaPi:
http://www.elacom.de/bananatracker.php