AUTOCONF(4)            OpenBSD Programmer's Manual (VAX)           AUTOCONF(4)

NAME
     autoconf - diagnostics from the autoconfiguration code

DESCRIPTION
     When OpenBSD 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.

     On the VAX, devices in NEXUS slots are normally noted, thus memory con-
     trollers, UNIBUS and MASSBUS adaptors.  Devices which are not supported
     which are found in NEXUS slots are noted also.  The Q-bus, if present, is
     configured in the same way as the UNIBUS.

     MASSBUS devices are located by a very deterministic procedure since
     MASSBUS space is completely probe-able.  If devices exist which are not
     configured they will be silently ignored; if devices exist of unsupported
     type they will be noted.

     UNIBUS devices are located by probing to see if their control-status reg-
     isters respond.  If not, they are silently ignored.  If the control sta-
     tus register responds but the device cannot be made to interrupt, a diag-
     nostic warning will be printed on the console and the device will not be
     available to the system.

     Normally, the system uses the disk from which it was loaded as the root
     filesystem.  If that is not possible, a generic system will pick its root
     device as the ``best'' available device (MASSBUS disks are better than
     SMD UNIBUS disks are better than RK07s; the device must be drive 0 to be
     considered).  If such a system is booted with the RB_ASKNAME option (see
     reboot(2)), then the name of the root device is read from the console
     terminal at boot time, and any available device may be used.

DIAGNOSTICS
     cpu type %d not configured.  You tried to boot OpenBSD on a CPU type
     which it doesn't (or at least this compiled version of OpenBSD doesn't)
     understand.

     mba%d at tr%d.  A MASSBUS adapter was found in `tr%d' (the NEXUS slot
     number).  OpenBSD will call it `mba%d'.

     %d mbas not configured.  More MASSBUS adapters were found on the machine
     than were declared in the machine configuration; the excess MASSBUS
     adapters will not be accessible.

     uba%d at tr%d.  A UNIBUS or Q-bus adapter was found in `tr%d' (the NEXUS
     slot number).  OpenBSD will call it `uba%d'.

     dr32 unsupported (at tr %d).  A DR32 interface was found in a NEXUS, for
     which OpenBSD does not have a driver.

     ci unsupported (at tr %d).  A CI interface was found in a NEXUS, for
     which OpenBSD does not have a driver.

     mcr%d at tr%d.  A memory controller was found in `tr%d' (the NEXUS slot
     number).  OpenBSD will call it `mcr%d'.

     5 mcrs unsupported.  OpenBSD supports only 4 memory controllers per CPU.

     mpm unsupported (at tr%d).  Multi-port memory is unsupported in the sense
     that OpenBSD does not know how to poll it for ECC errors.



     %s%d at mba%d drive %d.  A tape formatter or a disk was found on the
     MASSBUS; for disks `%s%d' will look like ``hp0'', for tape formatters
     like ``ht1''. The drive number comes from the unit plug on the drive or
     in the TM formatter (not on the tape drive; see below).

     %s%d at %s%d slave %d.  (For MASSBUS devices).  Which would look like
     ``tu0 at ht0 slave 0'', where ``tu0'' is the name for the tape device and
     ``ht0'' is the name for the formatter.  A tape slave was found on the
     tape formatter at the indicated drive number (on the front of the tape
     drive).  UNIX will call the device, e.g., ``tu0''.

     %s%d at uba%d csr %o vec %o ipl %x.  The device `%s%d', e.g.  ``dz0'' was
     found on `uba%d' at control-status register address `%o' and with device
     vector `%o'. The device interrupted at priority level `%x'.

     %s%d at uba%d csr %o zero vector.  The device did not present a valid in-
     terrupt vector, rather presented 0 (a passive release condition) to the
     adapter.

     %s%d at uba%d csr %o didn't interrupt.  The device did not interrupt,
     likely because it is broken, hung, or not the kind of device it is adver-
     tised to be.

     %s%d at %s%d slave %d.  (For UNIBUS or Q-bus devices).  Which would look
     like ``up0 at sc0 slave 0'', where ``up0'' is the name of a disk drive
     and ``sc0'' is the name of the controller.  Analogous to MASSBUS case.

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

HISTORY
     The autoconf feature appeared in 4.1BSD.

OpenBSD 3.0                     March 27, 1991                               2
