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BSD 2.11 - man page for autoconfig (bsd section 8)

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AUTOCONFIG(8)									    AUTOCONFIG(8)

NAME
       autoconfig - configure the running system to the hardware

SYNOPSIS
       autoconfig [-i ifile] [-n nfile] [-k kfile] [-v] [-d] [-c]

DESCRIPTION
       Autoconfig  is  called  by init(8) to configure the currently running system.  Init checks
       the exit status of autoconfig to determine if the configuration was successful.	 Autocon-
       fig reads the device table /etc/dtab for a list of devices which may be on the system.  It
       first verifies that the kernel has an attach routine for each device (and therefore has	a
       device  handler)  and  that  the kernel has a probe routine.  It then checks each of these
       devices to see if it is present, and if it is, attempts to make it interrupt (if possible)
       to  verify  that  the interrupt vector is correct.  The interrupt vector is checked to see
       that it has not previously been used.  An interrupt through any of the  device's  consecu-
       tive vectors is sufficient.

       Devices which use programmable vectors (MSCP and TMSCP) are permitted to have a value of 0
       in the dtab vector field.  This special value tells autoconfig to call  the  kernel's  get
       next  available	vector	routine  and  assign that to the device.  For programmable vector
       devices if the dtab vector field is non 0 then the value specified in  the  dtab  file  is
       used.   In  both  cases	the driver is called at its xxVec() routine with the vector being
       assigned to the device.

       If the address and vector are correct, it then attaches the device by passing the  address
       and unit number to the kernel's attach routine and setting up the interrupt vector accord-
       ing to the interrupt handlers and priority listed in the device table.  If the unit number
       is  given as a '?' in the device table, it will be assigned the next available unit number
       if the device exists.  If the device is not present or the vector is incorrect, and if the
       unit  number  was specified (not a '?'), then the kernel is notified that that unit is not
       present, preventing accesses to a nonexistent device address.

       There are only a few flags which are mostly useful for  debugging  but  for  completeness,
       here they are.

       -i ifile  Use ifile instead of /etc/dtab as the device table.

       -n nfile  Use  nfile  instead  of  /unix for finding the namelist of the currently running
		 kernel.

       -k kfile  The file kfile should be used instead of /dev/kmem to alter and read kernel mem-
		 ory.

       -v	 Verbose  output,  indicates reason for rejecting any device in the device table.
		 Normally only attached devices are reported.

       -c	 Report error messages for devices skipped because of problems with their  inter-
		 rupt vectors.

       -d	 Turn  on  debugging mode.  Shows many gory details of autoconfig's internal pro-
		 cessing.

BUGS
       Devices of the same type must be listed with ascending unit numbers or with wildcards.

       Disks that could be root devices must have their addresses and vectors initialized in  the
       kernel; the kernel uses a root attach entry in the block device switch to allow disk driv-
       ers to do any probes necessary before autoconfiguration.

       Must be run only by init(8).  There is a flag  set  in  the  kernel  that  autoconfig  has
       already run, running autoconfig a second time results in the error:

       "namelist doesn't match running kernel."
	      Autoconfig attempts to open /dev/kmem for write.	If the kernel is in securelevel 1
	      or higher the open of /dev/kmem will fail.

FILES
       /etc/dtab	   device table
       /unix
       /dev/kmem

SEE ALSO
       ucall(2), nlist(3), dtab(5)

3rd Berkeley Distribution		December 30, 1992			    AUTOCONFIG(8)
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