highlights from boot.cfg:
menu=Boot Xen 3.3 with single-user dom0:load /netbsd-XEN3_DOM0 -s;multiboot
/xen33.gz dom0_mem=512M
menu=Boot Xen 4.1 with single-user dom0:load /netbsd-XEN3_DOM0 -s;multiboot
/xen41.gz dom0_mem=512M
xen33.gz is from sysutils/xenkernel33, xen41.gz is from sysutils/xenkernel41
netbsd-XEN3_DOM0 is 16 Jan -current. (box normally runs -current/amd64)
installed /boot and bootxx_ffsv1 from 16th Jan too just in case.
In both boot cases, the last thing I see is Scrubbing Free RAM, then blank
screen, and I hear what might be a reboot click, but it doesn't actually
reboot.