autoconf man page on BSDOS

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AUTOCONF(4)		    BSD Programmer's Manual		   AUTOCONF(4)

NAME
     autoconf - diagnostics from the autoconfiguration code

DESCRIPTION
     When the system bootstraps it probes the innards of the machine on which
     it is running and locates controllers, drives, and other devices.	Each
     item found is recorded on the console.  This procedure is driven by a
     system configuration table which is processed by config(8) 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 reg-
     ister responds but the device cannot be made to interrupt, a diagnostic
     warning may be printed on the console and either the device will not be
     available to the system, or a default interrupt level will be assumed.
     Alternatively, interrupt autoconfiguration may be bypassed by assigning a
     fixed interrupt level (``irq'') in the kernel configuration file.	The
     configuration information may also include the location and size of de-
     vice memory, which is also checked when probing the device, and/or a dma
     channel (``drq''). Some configuration parameters must be set to agree
     with the hardware configuration.  Other parameters may cause the hardware
     to be configured according to the kernel configuration.  See the individ-
     ual manual pages for the devices for configuration information.

     Options are available to obtain additional information about the autocon-
     figuration process and/or to avoid probing individual devices.  This is
     controlled by the -autodebug value given to the boot program (see
     boot(8)).	A value of 1 causes verbose output including each device and
     location probed and the outcome.  The autoconfiguration output is pagi-
     nated in this mode, requiring a key to be pressed after each screen.  A
     value of 2 causes confirmation to be requested before probing each device
     and location in addition to the verbose output.  These options may be
     useful in debugging failures during autoconfiguration.

     Normally, the system uses the disk partition from which it was loaded as
     the root filesystem.  If the RB_DFLTROOT option is specified (see
     reboot(2)),  the system will instead use the pre-configured root device.
     If a GENERIC system is booted with the RB_ASKNAME option, then the name
     of the root device is read from the console terminal at boot time, and
     any available device may be used.

DIAGNOSTICS
     isa0 (root)  The primary system bus is an ISA bus.

     isa0 (root): eisa	The primary system bus is an EISA bus.

     %s%d at isa0 iobase 0x%x irq %d drq %d %s%d0 %s%d1	 A device with the
     specified i/o base address, interrupt level, dma request level and memory
     mapped region was found.  Fields that are meaningless for a particular
     device are omitted.

     Warning: probe of %s%d may have modified ports 0x%x - 0x%x, already in
     use  An attempt to probe a device failed because some of the ports re-
     quired had already been claimed by a previous device.  This could cause
     problems in operation of the device owning the ports in the specified
     range.

     fd%d at fdc%d slave %d  A floppy disk attached to the specified floppy
     controller was found.

     wd%d at wdc%d slave %d  A winchester disk attached to the specified con-
     troller was found.

     %s%d at tg%d unit %d: inquiry-info	 A SCSI disk or tape was found at the
     specified SCSI target number.  The inquiry-info is the string returned by
     the SCSI Inquiry command.

SEE ALSO
     intro(4),	boot(8),  config(8)

HISTORY
     The autoconf feature first appeared in 4.1BSD. The current version is
     based on work done at Lawrence Berkeley Laboratory.

 BSD/OS			       October 31, 1994				     2
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