Of course, if a hypervisor is already available for the board, then it
would be just as easy to use a paravirtualized interface, e.g. Xen's
HYPERVISOR_console_io hypercall. But somebody has to port the
hypervisor first :-)

Of course a console is needed. But I was questioning the need for something much
more elaborate than a putchar/getchar interface. I understand its needed to port
the hypervisor but I undersatnd it would be needed for very early parts of the hypervisor where it does not even have the ability to master a uart on its own.

regards
ved