All this is typed out so please excuse typos.
This is after manually assigning inet and netmask.
$ ifconfig sis0
sis0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
lladdr 00:fe:e1:ba:d0:a7
media: Ethernet autoselect (none)
status: no carrier
inet6 fe80::2fe::e1ff::feba::d0a7%sis0 prefixlen 64 scopeid 0x1
inet 192.168.2.10 netmask 0xffffff00 broadcast 192.168.2.255
Also listed by ifconfig are lo0 and enc0
$ dmesg | grep 'sis0'
sis0 at pci0 dev 1 function 1 "SiS 900 10/100BaseTX" rev 0x82: irq 3, address 07:29:02:50:80:00
ukphy0 at sis0 phy 0: Generic IEEE 802.3u media interface, rev. 5: OUI 0x004063, model 0x0032