IBM RS/6000 - Manual (Page 102)

5.1.3 bootlist Command
On the E20 and F30 (and 43P), the bootlist command can be used to alter the
customized Boot List. For example, you can set the customized Boot List with the
following command:
bootlist -m normal hdisk
This would set the customized Boot List in the NVRAM to hdisk0. Then, hdisk0
would then be used to attempt a boot in Normal mode. It should be noted that the
Boot Device Order List service (which is the default Boot List) cannot be altered.
Attempting to change the service Boot List this way will result in the following error:
bootlist -m service rmt hdisk cd
514-22 bootlist: Invalid mode (service) for this model
One other point to note is that the RSPC machines cannot use the generic terms
such as scdisk or rmt for devices. All the devices must be explicitly stated, for
example rmt0. Trying to use generic options will result in an error:
bootlist -m normal scdisk
514-2 2 bootlist: Invalid device name (scdisk)
There are, therefore, two ways to alter the customized Boot List: from System
Management Services and from AIX using the
bootlist command. There is no
way to alter the Service Boot List as there is with the microchannel-based RS/6000
systems
5.2 Entering Debug Mode
On a microchannel-based RS/6000 system you can enter debug mode, lldb, by
switching the key to Service and pressing one of the following key combinations:
CTL-ALT-NUMPAD4 (on a graphical console)
CTL-\ (on an ASCII display)
The CTL-\ key combination is valid on most OEM terminals. On some IBM 3151
terminals, using a cartridge, you may have to press CTL-NUMPAD4.
Since the E20 and F30 have a static electronic key which is set to Normal during
the normal operation of AIX, the above key sequences will not work unless the
debugger, lldb, is pinned. You can do this by entering the following command and
rebooting your machine:
bosboot -D -a -d /dev/hdiskx
Where hdiskx is the disk containing the boot logical volume. After rebooting your
machine, using either of the two key sequences shown above will invoke the
debugger on an ASCII terminal (although the debugger can be invoked with a
graphical display keyboard, an ASCII terminal must be attached to use the
debugger). Be aware that anyone using either a graphical or ASCII console will be
able to make the machine unavailable to other users.
78 Introduction to PCI-Based RS/6000 Servers