Hi,
Thanks for your interest, but i built my own modules and the result is the same:
root@NAS3:/volume1/pub/virtio# insmod virtio.ko
root@NAS3:/volume1/pub/virtio# insmod virtio_ring.ko
root@NAS3:/volume1/pub/virtio# insmod virtio_console.ko
insmod: ERROR: could not insert module virtio_console.ko: Unknown symbol in module
root@NAS3:/volume1/pub/virtio# lsmod | grep virtio
virtio_ring 7872 0
virtio 3506 0
dmesg
[ 2087.718754] virtio_console: Unknown symbol hvc_remove (err 0)
[ 2087.718782] virtio_console: Unknown symbol hvc_kick (err 0)
[ 2087.718794] virtio_console: Unknown symbol hvc_alloc (err 0)
[ 2087.718805] virtio_console: Unknown symbol hvc_poll (err 0)
[ 2087.718819] virtio_console: Unknown symbol hvc_instantiate (err 0)
[ 2087.718832] virtio_console: Unknown symbol __hvc_resize (err 0)