The sr driver supports the RISCom/N2 ISA cards, N2pci and the WANic 400/405 PCI cards that are based on the HD64570 chip.
If you have ISA cards, you need to specify the resources for them in /boot/device.hints. If you have the second ISA card, add
.Fx sppp code is used for the link level layer. The default protocol used is PPP. The Cisco HDLC protocol can be used by adding link2 to ifconfig(8).
Alternately, the driver can be compiled to support netgraph(4) (see below).
The flags specification in /boot/device.hints is optional. If it is not specified, the driver will assume the following: