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Appendix D: Challenge IO4 PROM, Mezzanine, and Troubleshooting
The root variable tells IRIX the name of the device that holds the root
filesystem. Because this variable is used by IRIX, rather than by the PROM,
its format is different from the “SystemPartition” and “OSLoadPartition”
variables. The default value for root is “dks0d1s0,” which specifies that the
root filesystem is stored on SCSI controller 0, disk 1, on partition 0.
The following three examples show you what the command line looks like
when you change the boot device.
To boot off of disk number 2 on controller 0, type the following:
setenv SystemPartition dksc (0,2,8)
setenv OSLoadPartition dksc (0,2,0)
setenv root dks0d2s0
To boot off of disk number 1 on controller 1, type the following:
setenv SystemPartition dksc (1,1,8)
setenv OSLoadPartition dksc (1,1,0)
setenv root dks1d1s0
To boot off of disk number 3 on controller 2, type the following:
setenv SystemPartition dksc (2,3,8)
setenv OSLoadPartition dksc (2,3,0)
setenv root dks2d3s0
Starting the System Automatically
Each time the system is powered on, the PROM pauses briefly before
starting the operating system. If the “Stop for System Maintenance” option
is not selected, or if the
<Esc>
key is not pressed, the system loads the
operating system from memory and begins to execute it. Setting the
environment variable
autoload to “yes” enables this feature. Setting autoload
to “no” inhibits the automatic startup and causes the PROM to display the
System Maintenance menu after running the power-on diagnostics.