Silicon Graphics Origin 3900 User Manual page 141

Operating L1 Controller
The output console input: 001c07 console0 shows that the L2 controller will
send console input to brick 001c07 and the subchannel to be used is the console
subchannel on node 0.
To change system console from one Cx-brick to another, use the select <rack> <slot>
command:
001c07-L1> select r 2 s 7
console input: 002c07 console0
console output: not filtered.
001c07-L1>
To change the subchannel used on the selected brick, use the select command followed
by the subchannel number or the word console followed by a node number:
001c07-L1> select sub 0A
console input: 001c07 CPU 0A
console output: not filtered.
001c07-L1>
Note: See the bulleted list in "Console Selection" on page 114 for valid subchannels.
During the boot process on a multi-rack system, there is a window of time in which all
Cx-bricks are producing output. This output can produce a somewhat jumbled output at
the L1 controller. However, you can filter the console output so that the L1 controller
shows output from only the brick chosen to receive console input. You can turn filtering
on and off with the select filter command.
If you attempt to communicate with a brick that is not responding, a time-out condition
results:
001c07-L1>
entering console mode 001c07 console, <CTRL-T> to escape to L1
no response from 001c07 junk bus console UART:UART_TIMEOUT
When this time-out condition occurs, either the brick is hung or the subchannel is
incorrect.
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