Replace the firmware reset command by a register write which also causes a device reset.  This enables resetting also on amd64, and therefore reinitializing after the 'up' 'down' dance works now there.
Replace the firmware reset command by a register write which also
causes a device reset.  This enables resetting also on amd64,
and therefore reinitializing after the 'up' 'down' dance works
now there.

ok claudio@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars