Loading and starting the KDB kernel debugger

For AIX® 5.1 and subsequent releases, the KDB kernel debugger is the standard kernel debugger.

The KDB kernel debugger must be loaded at boot time. This requires that a boot image be created with the debugger enabled. To enable the KDB kernel debugger, use either the -I or -D options of the bosboot command.

Examples of bosboot commands are as follows:

To disable the KDB kernel debugger, use the following command:
```
bosboot -a -d /dev/ipldevice
```
To enable the KDB kernel debugger, but not invoke it during system initialization, use the following command:
```
bosboot -a -d /dev/ipldevice -D
```
To enable the KDB kernel debugger, and invoke it during system initialization, use the following command:
```
bosboot -a -d /dev/ipldevice -I
```

Note:

The bosboot commands build boot images using the KDB kernel debugger. The boot image is not used until the machine is restarted.
External interrupts are disabled while the KDB kernel debugger is active.
If invoked during system initialization, the g subcommand must be issued to continue the initialization process.