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DESCRIPTION

Cold starts. These are processor-type dependent. On the CCI Power 6/32 and related processors, the system will do a standard autoboot from drive 0 upon power-up or reset. This automatic boot may be cancelled by typing a ‘#’ in the first few seconds after reset. This enters console mode; the console prompt is ‘>’ or ‘#’. The boot flags can be set to any hexadecimal value -n with the command

The default device may be examined or set; see the Diagnostics and Debugging manual for the processor for details on device naming and syntax. After setting the boot flags and/or device, a bootstrap sequence can be initiated with

A specific device or bootstrap file may be used; for example,

would boot from the `a' partition on XFD drive 1.

The file specifications used for the boostrap when loaded with the “askme” flag (register 23 set to 1 or 3) are of the form:

where device is the type of the device to be searched, adaptor is number of the VERSAbus (or VMEbus) to which the device is attached, controller is the unit number of the controller on that buss, unit is the unit number of the disk or tape, and minor is the disk partition or tape file number. Leading adaptor or controller numbers default to 0. Normal line editing characters can be used when typing the file specification. The following list of supported devices may vary from installation to installation:

dk	SMD or ESDI disks on VDDC or SMD-E
cy	tape on Ciprico Tapemaster controller

For example, to boot from a file system which starts at cylinder 0 of unit 0 of an SMD-E disk, type ‘dk(0,0)vmunix’ to the boot prompt; ‘dk(2,1,0)vmunix’ would specify drive 1 on SMD-E controller 2.

In an emergency, the bootstrap methods described in the paper Installing and Operating 4.3 BSD-tahoe UNIX on the Tahoe can be used to boot from a distribution tape.