NAME

     snc — National Semiconductor DP8393X SONIC Ethernet adapter driver

SYNOPSIS

     device isa
     device snc

DESCRIPTION

     The snc driver provides support for the National Semiconductor SONIC Ethernet adapters.

HARDWARE

     The snc driver supports the following cards:

     •   National Semiconductor DP83934AVQB
     •   NEC PC-9801-83
     •   NEC PC-9801-84
     •   NEC PC-9801-103
     •   NEC PC-9801-104
     •   NEC PC-9801N-15
     •   NEC PC-9801N-25
     •   NEC PC-9801N-J02 PCMCIA
     •   NEC PC-9801N-J02R PCMCIA

     The snc driver also includes support for the National Semiconductor NS46C46 as 64 * 16 bits
     Microwave Serial EEPROM.

IMPLEMENTATION NOTES

     Accessing SONIC card data structures and registers as 32 bit values makes code endianness
     independent.  The SONIC is however always in big-endian mode so it is necessary to ensure
     that data structures shared between the CPU and the SONIC card are always in big-endian
     order.  The snc driver supports the PC-98 C-Bus, and PnP buses.  Support is also provided
     for the legacy C-Bus.

DIAGNOSTICS

     The following driver specific error messages may be reported:

     snc%d: snc_nec16_register_irq: unsupported irq (%d)  The card returned an IRQ which is not
     supported by the driver.

     snc%d: invalid packet length %d bytes  An attempt to transfer a data packet failed due to an
     invalid packet length.

SEE ALSO

     netintro(4), bus_alloc_resource_any(9)

HISTORY

     The snc driver was ported from NetBSD by Motomichi Matsuzaki <mzaki@e-mail.ne.jp> and
     Hiroshi Yamashita <bluemoon@msj.biglobe.ne.jp>.  It first appeared in FreeBSD 4.2.  This
     manual page first appeared in FreeBSD 5.3.

AUTHORS

     This manual page was written by Tom Rhodes <trhodes@FreeBSD.org>.

BUGS

     Currently the snc driver only works on the PC-98 architecture.  It should probably work on
     the i386 architecture as well.