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Chapter 7 Configuring Console Access 141
Reference for System Console OpenBoot
Variable Settings
Certain OpenBoot configuration variables control from where system console input
is taken and to where its output is directed. The table below shows how to set these
variables in order to use ttya, the system controller, or a local graphics terminal as
the system console.
In addition to the above OpenBoot configuration variables, there are other variables
that determine whether and what kinds of diagnostic tests run. These variables are
discussed in “Controlling POST Diagnostics” on page 82.
TABLE 7-2 OpenBoot Configuration Variables That Affect the System Console
OpenBoot Variable Name
Setting for Sending System Console Output to:
Serial Port (ttya) System Controller Graphics Terminal
12
diag-out-console false true false
output-device ttya rsc-console screen
input-device ttya rsc-console keyboard
1 – POST output will still be directed to the serial port, as POST has no mechanism to direct its output to a
graphics terminal.
2 –If thesystem detectsno localgraphics terminal,it directsall outputto (andaccepts inputfrom) theserial
port.