Data General AViiON 4600 Series, Customer Documentation

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Using the SCM Configuration Menus
5-4
014–002091
About the Bootstrap Process
To identify any peripheral device to the system, you must provide a device
specification , a software descriptor that uniquely identifies that device. The boot path
is a devicespecification for a bootablehardwaredeviceand, optionally, a second
software descriptor that points to an executable image on the booted media called the
file path . TheSCM passes thefilepath to thebooted program after loading thefirst
stagebootstrap from theboot device.
Together, the boot device specification and the optional file path represent a first and
second stage boot process; they comprise a full boot path. Figure 5-2 shows their
combined formats. A full boot path contains a maximum of 80 characters.
dev([cntrl],[unit],[LUN#] ) [logical–disk–name:][/dir...]/file
Boot device specification
(first stage boot)
File path
(second stage boot)
Figure 5–2 Full Boot Path Format
NOTE: The syntax for booting over a LAN is slightly different; refer to the section
Booting Over a Local Area Network."
The following sections provide first- and second-stage boot path examples for disk,
tape, and LAN boot devices.
Booting from Disk or Tape
This section provides first-stage boot path specifications for disk and tape devices
installed in a mass-storage subsystem that is connected to the extended SCSI bus.
Refer to Chapter 2 for information about connecting a SCSI-based mass-storage
device to the rear panel SCSI bus connector. Refer to theBooting Over a Local Area
Network" section for information about booting your computer from a LAN server.
Refer to Appendix B for a detailed description of device specification syntax.
Table 5-1 lists the device specification you use when your drives, either internal or
external, are installed on the first SCSI bus (controller 0).