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INTRO(4) NetBSD/evbarm Kernel Interfaces Manual INTRO(4)
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Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
intro -- introduction to evbarm special files and hardware support
The evbarm port is really a collection of ports of NetBSD to a range of
development and evaluation boards based on the ARM Architecture.
This section describes the supported boards, the special files, related
driver functions, and networking support available in each 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(1) 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
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 some of the hardware supported on the various
boards. Software support for these devices comes in two forms. A hard-
ware 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 must be rebooted.
The autoconfiguration system is described in autoconf(4).
The evbarm intro appeared in NetBSD 2.0.
NetBSD 9.99 May 27, 2020 NetBSD 9.99