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INTRO(4)	    FreeBSD/amd64 Kernel Interfaces Manual	      INTRO(4)

     intro -- introduction to special files and	hardware support

     The manual	pages in section 4 describe the	special	files, related driver
     functions,	and networking support available in the	system.	 In this part
     of	the manual, the	SYNOPSIS section of each configurable device gives a
     sample specification for use in constructing a system description for the
     config(8) program.	 The DIAGNOSTICS section lists messages	which may
     appear on the console and/or in the system	error log /var/log/messages
     due to errors in device operation;	see syslogd(8) for more	information.

     This section contains both	devices	which may be configured	into the sys-
     tem and network related information.  The networking support is intro-
     duced in netintro(4).

     This section describes the	hardware supported on the amd64	platform.
     Software support for these	devices	comes in two forms.  A hardware	device
     may be supported with a character or block	device driver, or it may be
     used within the networking	subsystem and have a network interface driver.
     Block and character devices are accessed through files in the file	system
     of	a special type;	see mknod(8).  Network interfaces are indirectly
     accessed through the interprocess communication facilities	provided by
     the system; see socket(2).

     A hardware	device is identified to	the system at configuration time and
     the appropriate device or network interface driver	is then	compiled into
     the system.  When the resultant system is booted, the autoconfiguration
     facilities	in the system probe for	the device and,	if found, enable the
     software support for it.  If a device does	not respond at autoconfigura-
     tion time it is not accessible at any time	afterwards.  To	enable a
     device which did not autoconfigure, the system will have to be rebooted.

     The autoconfiguration system is described in autoconf(4).

     A complete	list of	available devices is contained within the pages
     describing	the system buses and controllers.  For example,	a PCI device
     would be listed in	the pci(4) man page.  The following buses and con-
     trollers list these devices:

	cardbus(4)    introduction to CardBus support
	eisa(4)	      introduction to EISA bus support
	iic(4)	      Inter IC (I2C) bus
	isa(4)	      introduction to ISA bus support
	isapnp(4)     introduction to ISA Plug-and-Play	support
	onewire(4)    1-Wire bus
	pci(4)	      introduction to PCI bus support
	pcmcia(4)     introduction to PCMCIA (PC Card) support
	usb(4)	      introduction to Universal	Serial Bus support

     autoconf(4), cpu(4), config(8)

     The amd64 intro first appeared in OpenBSD 3.5.

FreeBSD	11.1			 June 23, 2017			  FreeBSD 11.1


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