AUTOCONF(4) | Kernel Interfaces Manual (VAX) | AUTOCONF(4) |
On the VAX, devices in NEXUS slots are normally noted, thus memory controllers, UNIBUS and MASSBUS adaptors. Devices which are not supported which are found in NEXUS slots are noted also. The Q-bus on the MICROVAX 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 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.
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.
tr%d
' (the NEXUS slot number). NetBSD will call it ‘mba%d
'.
tr%d
' (the NEXUS slot number). NetBSD will call it ‘uba%d
'.
tr%d
' (the NEXUS slot number). NetBSD will call it ‘mcr%d
'.
%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).
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
', 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
'.
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.June 5, 1993 | NetBSD 6.1 |