On Mon, Apr 09, Matt Sealey wrote:

It is entirely possible that a user may redirect the OF console output to
the PSC6 controller or another internal or external serial device (PCI
serial controller or so). In this case, the boot console will simply switch
to the UART on the back, which may be some other custom device and not a
valid console.

How many serial drivers are enabled in the public Efika firmware?
With my change, both /failsafe and the /builtin/serial work.
Both have device_type == "serial"