.\" Copyright (c) 1986, 1991 Regents of the University of California.
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" @(#)autoconf.4 6.3 (Berkeley) 3/27/91
.Nd diagnostics from autoconfiguration code
bootstraps it probes the innards of the machine it is running
on and locates controllers, drives, and other devices, printing out
what it finds on the console. This procedure is driven by a system
configuration table which is processed by
and compiled into each kernel.
devices are located by probing to see if their control-status
registers respond. If not, they are silently ignored. If the control
status register responds but the device cannot be made to interrupt,
a diagnostic warning will be printed on the console and the device
will not be available to the system.
A generic system may be built which picks its root device at boot time
If such a system is booted with the
then the name of the root device is read from the console terminal at boot
time, and any available device may be used.
adapter was found and mapped into the
address space of the operating system starting at virtual address
.It %s%d at vba%d drive %d.
A tape formatter or a disk was found
The drive number comes from the unit plug on the drive
on the tape drive; see below).
.It %s%d at %s%d slave %d.
.Sq Li yc0 at cy0 slave 0% ,
is the name for the tape device and
for the formatter. A tape slave was found on the tape formatter at the
indicated drive number (on the front of the tape drive).
will call the device, e.g.,
.It %s%d at vba%d csr %x vec %x ipl %x.
at control-status register address
The device interrupted at priority level
.It %s%d at vba%d csr %x no interrupts.
at control-status register address
interrupts were configured for the device.
.It %s%d at vba%d csr %x didn't interrupt.
The device did not interrupt,
likely because it is broken, hung, or not the kind of device it is advertised
to be. The csr address is interpreted as described above.
.It %s%d at %s%d slave %d.
.Sq Li dk0 at vd0 slave 0 ,
is the name of a disk drive and
Very few devices actually figure out their interrupt vector
by forcing the device to interrupt. Only the upper megabyte of the
address space is mapped into the system's virtual address space.
projects / unix-history / blob