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.Dd May 27, 2020 .Dt INTRO 4 evbarm .Os .Sh NAME .Nm intro .Nd introduction to evbarm special files and hardware support .Sh DESCRIPTION The evbarm port is really a collection of ports of .Nx to a range of development and evaluation boards based on the ARM Architecture.
p 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 .Tn SYNOPSIS section of each configurable device gives a sample specification for use in constructing a system description for the .Xr config 1 program. The .Tn DIAGNOSTICS section lists messages which may appear on the console and/or in the system error log
a /var/log/messages due to errors in device operation; see .Xr syslogd 8 for more information.
p This section contains both devices which may be configured into the system and network related information. The networking support is introduced in .Xr netintro 4 . .Sh DEVICE SUPPORT This section describes some of the hardware supported on the various boards. Software support for these devices comes in two forms. A hardware device may be supported with a character or block .Em device driver , or it may be used within the networking subsystem and have a .Em network interface driver . Block and character devices are accessed through files in the file system of a special type; see .Xr mknod 8 . Network interfaces are indirectly accessed through the interprocess communication facilities provided by the system; see .Xr socket 2 .
p 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 autoconfiguration time it is not accessible at any time afterwards. To enable a device which did not autoconfigure, the system must be rebooted.
p The autoconfiguration system is described in .Xr autoconf 4 . .Sh SEE ALSO .Xr config 1 , .Xr autoconf 4 .Sh HISTORY The .Tn evbarm .Nm intro appeared in .Nx 2.0 .
Indexes created Wed Sep 24 05:09:52 GMT 2025