> Can anyone confirm if these two options are available ... simultaneously?
> Is it possible to program the ATxmega128A4U from an embedded linux
> computer running avrdude using linuxgpio?
I'm afraid it's not possible. As far as I can see in the sourcecode,
the linuxgpio driver *only* supports bitbang ISP programming, which
means it is restricted to "classic" AVRs.
cheers, Joerg .-.-. --... ...-- -.. . DL8DTL