IBM 150 Manual De Usuario

© Copyright IBM Corp. 1998

This chapter provides useful hints and tips, not only for the Models 150 and 
260, but for all RS/6000 models.

One of the main differences between Micro Channel-based RS/6000 systems 
and PCI-based RS/6000 systems is the omission of a physical key. On all 
Micro Channel-based RS/6000 systems, there is a physical key that can be in 
one of three positions:

  • Normal

    • Service

  • Secure

Although the Models 150 and 260 (and also the other PCI-based RS/6000 
models) do not have this physical key, they have an electronic key-switch 
instead. Currently, this provides the ability to boot the machine in Normal or 
Service mode. The electronic key-switch is a logical key-switch, separate 
from a physical one, that the platform firmware knows about. Its state is 
communicated from the firmware to AIX through a residual data environment 
variable. Currently, only the firmware can set the electronic key-switch.

bootlist

The 

bootlist

 command can be used to alter or display the boot list. For 

example, you can set the customized boot list with the following command:

# bootlist -m normal hdisk0

This would set the customized boot list in the NVRAM to 

hdisk0

. 

hdisk0

 would 

then be used to attempt a boot in Normal mode.

The service bootlist can be determined with the command:

# bootlist -m service -o

The output is as follows and depends on your settings:

fd0

cd0

rmt0

hdisk0

ent0