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     ndis — NDIS miniport driver wrapper


     options NDISAPI
     device ndis
     device wlan


     The ndis driver is a wrapper designed to allow binary Windows® NDIS
     miniport network drivers to be used with FreeBSD.  The ndis driver is
     provided in source code form and must be combined with the Windows®
     driver supplied with your network adapter.  The ndis driver uses the
     ndisapi kernel subsystem to relocate and link the Windows® binary so that
     it can be used in conjunction with native code.  The ndisapi subsystem
     provides an interface between the NDIS API and the FreeBSD networking
     infrastructure.  The Windows® driver is essentially fooled into thinking
     it is running on Windows®.  Note that this means the ndis driver is only
     useful on x86 machines.

     To build a functional driver, the user must have a copy of the driver
     distribution media for his or her card.  From this distribution, the user
     must extract two files: the .SYS file containing the driver binary code,
     and its companion .INF file, which contains the definitions for driver-
     specific registry keys and other installation data such as device
     identifiers.  These two files can be converted into a kernel module file
     using the ndisgen(8) utility.  This file contains a binary image of the
     driver plus registry key data.  When the ndis driver loads, it will
     create sysctl(3) nodes for each registry key extracted from the .INF

     The ndis driver is designed to support mainly Ethernet and wireless
     network devices with PCI, PCMCIA and USB bus attachments.  (Cardbus
     devices are also supported as a subset of PCI.)  It can support many
     different media types and speeds.  One limitation however, is that there
     is no consistent way to learn if an Ethernet device is operating in full
     or half duplex mode.  The NDIS API allows for a generic means for
     determining link state and speed, but not the duplex setting.  There may
     be driver-specific registry keys to control the media setting which can
     be configured via the sysctl(8) command.


     ndis%d: watchdog timeout  A packet was queued for transmission and a
     transmit command was issued, however the device failed to acknowledge the
     transmission before a timeout expired.


     altq(4), arp(4), netintro(4), ng_ether(4), ifconfig(8), ndis_events(8),
     ndiscvt(8), ndisgen(8), wpa_supplicant(8)

     NDIS 5.1 specification,


     The ndis device driver first appeared in FreeBSD 5.3.


     The ndis driver was written by Bill Paul ⟨⟩.