AUTOCONFIG(8)       UNIX Programmer's Manual        AUTOCONFIG(8)

NAME
     autoconfig - configure the running system to the hardware

SYNOPSIS
     autoconfig [ -i _i_f_i_l_e ] [ -n _n_f_i_l_e ] [ -k _k_f_i_l_e ] [ -v ] [
     -c ]

DESCRIPTION
     _A_u_t_o_c_o_n_f_i_g is called by _i_n_i_t(8) to configure the currently
     running system.  Init checks the exit status of autoconfig
     to determine if the configuration was successful.  _A_u_t_o_c_o_n_-
     _f_i_g reads the device table /_e_t_c/_d_t_a_b for a list of devices
     which may be on the system.  It first verifies that the ker-
     nel has an attach routine for each device (and therefore has
     a device handler), and that either the kernel or _a_u_t_o_c_o_n_f_i_g
     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 consecutive vectors is sufficient.  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 according
     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 vec-
     tor 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 only for
     debugging but for completeness, here they are.

     -i _i_f_i_l_e  Use _i_f_i_l_e instead of /_e_t_c/_d_t_a_b as the device
               table.

     -n _n_f_i_l_e  Use _n_f_i_l_e instead of /_u_n_i_x for finding the namel-
               ist of the currently running kernel.

     -k _k_f_i_l_e  The file _k_f_i_l_e should be used instead of /_d_e_v/_k_m_e_m
               to alter and read kernel memory.

     -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 interrupt vectors.

Printed 8/2/83                                                  1

AUTOCONFIG(8)       UNIX Programmer's Manual        AUTOCONFIG(8)

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
     drivers to do any probes necessary before autoconfiguration.

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

SEE ALSO
     ucall(2), dtab(5)

Printed 8/2/83                                                  2