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     snc -- National Semiconductor DP8393X SONIC Ethernet adapter driver


     device isa
     device snc


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


     The snc driver supports the following cards:

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

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


     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.


     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.


     netintro(4), bus_alloc_resource_any(9)


     The snc driver was ported from NetBSD by Motomichi Matsuzaki
     <> and Hiroshi Yamashita <>.
     It first appeared in FreeBSD 4.2.  This manual page first appeared in
     FreeBSD 5.3.


     This manual page was written by Tom Rhodes <>.


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