beagleboneblack: serial console not available within devuan
The header J1 on the beaglebone black provides a serial console. During the boot, the U-Boot and kernel boot messages are correctly displayed on this console. However when the boot is finished, there is no console available for logging in into the system.
The inittab refers to a non-existent ttyO0 device, while this serial console is available on ttyS0.
I will upload a merge request with a fix which was tested working on bbone black rev.B and rev.C.
