---
name: "sr"
section: "4freebsd"
platform: "linux"
package: "freebsd-manpages"
version: "7.0-2"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/sr/4freebsd"
---

# sr(4freebsd)

synchronous RISCom/N2 / WANic 400/405 device driver

## NAME

**sr** – synchronous RISCom/N2 / WANic 400/405 device driver

## SYNOPSIS

**device sr**

For ISA cards, in */boot/device.hints*: **hint.sr.0.at="isa"** **hint.sr.0.port="0x300"** **hint.sr.0.irq="10"** **hint.sr.0.maddr="0xd0000"** **hint.sr.0.flags="0x0"**

**device sppp**

## DESCRIPTION

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

```
hint.sr.1.at="isa"
```

```
hint.sr.1.port="0x310"
```

```
hint.sr.1.irq="11"
```

```
hint.sr.1.maddr="0xd0000"
```

```
hint.sr.1.flags="0x0"
```

The standard FreeBSD 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)](/ifconfig/8.md).

Alternately, the driver can be compiled to support [netgraph(4)](/netgraph/4.md) (see below).

The *flags* specification in */boot/device.hints* is optional. If it is not specified, the driver will assume the following:

- The card has 2 ports.

  - The clock for the serial ports is external and the transmitter uses

  the same clock as the receiver.

The *flags* are a bit field and can be used to force a different behaviour than the default.

- *0x01*

  The card has only one port.

- *0x10*

  Use separate external clocks for transmit and receive on port 0.

- *0x40*

  Use separate external clocks for transmit and receive on port 1.

The card only supports IRQ 3, 4, 5, 7, 10, 11, 12 and 15.

The iomem area is a 16Kb block and must start at a 16Kb boundary.

## HARDWARE

The **sr** driver supports the following hardware:

- SDL Communications RISCom/N2 ISA

- SDL Communications N2pci

- SDL Communications WANic 400/405 PCI

## NETGRAPH SUPPORT

If the kernel is compiled with options NETGRAPH then the sppp and Cisco HDLC modes are disabled (and the sppp driver is unneeded), and this driver functions as a [netgraph(4)](/netgraph/4.md) node with a single hook named rawdata. Connecting to this hook enables the transmission of raw HDLC frames. The node will have the same name as the device with \`\`sync\_'' prepended, e.g., sync\_sr0.

## DIAGNOSTICS

- sr%d: Warning illegal interrupt %d.

  The card cannot use the specified interrupt. Choose a different one.

## SEE ALSO

[ar(4)](/ar/4.md), [cx(4)](/cx/4.md), [netgraph(4)](/netgraph/4.md), [netintro(4)](/netintro/4.md), [ifconfig(8)](/ifconfig/8.md)

## AUTHORS

The **sr** device driver was written by John Hay ⟨jhay@FreeBSD.org⟩.

Netgraph support was added by Julian Elischer ⟨julian@FreeBSD.org⟩.

## BUGS

At the moment only the X.21 interface is tested. The others may need tweaks to the clock selection code.

The code can probably stand some optimizing.