Manual browser: sn(4)

SN(4) Kernel Interfaces Manual SN(4)


snNational Semiconductor DP83932 (SONIC) based Ethernet device driver



sn0 at jazzio?


sn* at obio?
sn* at nubus?


The sn interface provides access to a 10 Mb/s Ethernet network via the National Semiconductor DP83932 (SONIC) Ethernet chip set.

Each of the host's network addresses is specified at boot time with an SIOCSIFADDR ioctl(2). The sn interface employs the address resolution protocol described in arp(4) to dynamically map between Internet and Ethernet addresses on the local network.



The sn driver supports on-board JAZZ based SONIC interfaces found on Acer PICA and NEC machines.


The sn driver is currently known to support the following NuBus cards:
  • Apple LC Twisted-pair (part #820-0532-A) PDS card
  • Cayman Gatorcard PDS
  • Dayna DaynaPort/E30

In addition, the sn interface supports the following interfaces:

  • on-board Ethernet for non-AV Quadras
  • on-board Ethernet for 500-series PowerBooks
  • Apple CS Ethernet Twisted-pair card for Comm Slot found on LC575, Quadra 630, LC630, and Performa 580.


sn%d: transmit FIFO underrun
sn%d: receive FIFO overrun
sn%d: receive buffer exceeded
sn%d: receive buffers exhausted
sn%d: receive descriptors exhausted
These messages indicate that the interface gets errors (due to heavy load etc.) and reinitialized.


The sn interface for mac68k, which was derived from a driver for old NetBSD/pica port, first appeared in NetBSD 1.3.

Jason Thorpe has rewritten a new machine independent SONIC driver which uses bus_dma(9) and bus_space(9) APIs after NetBSD 1.5 release, and NetBSD/arc has been switched to using the machine independent (MI) driver.

NetBSD/mac68k has also been switched to using the MI driver after the NetBSD 4.0 release.

May 16, 2009 NetBSD 7.0