Installation guide

/dev/rz1b dump1 ufs sw 0 2
Note that the kernel will unconditionally write the crash dump to rz1b,
thus destroying any data on that partition. In most cases, crash dumps
should be written to one of the swap partitions. For more information about
controlling how the system writes crash dumps, see Kernel Debugging.
When you specify the dumps keyword, you also need to specify the location
of the root file system with the root on keyword. In the previous example,
the root file system is located on the a partition of the rz1 disk. The root
file system must be located on the specified partition, otherwise the system
will not boot.
5.6.3 Device Definition Keywords
The configuration file contains entries that define hardware devices for
your system. These entries include buses, controllers, and storage devices.
When your system is initially configured, the sizer program identifies all
the devices physically attached to your system and places their associated
entries in the configuration file.
For a complete list of supported devices, refer to the GENERIC configuration
file, the Software Product Description (SPD), or Appendix A.
5.6.4 The callout Keyword Definitions
The callout keyword definitions allow you to run any shell command
subprocess during kernel configuration. The callout keyword definition
invokes a subprocess, and the config program waits for the subprocess to
complete before continuing the configuration. For example, you can define a
callout keyword to send mail at a specific time during the configuration.
You can invoke any function with a callout keyword definition. If you use
a callout keyword, you must make sure that the command is in the
search path or that the full pathname is specified. Also, any system
resources required, such as memory, disks, or tapes, must be available.
There is no mechanism for determining if a subprocess succeeds or fails;
the config command behaves as if the subprocess succeeded. The function
must handle its own error conditions.
The callout keyword definition specifies the point in the configuration
sequence at which to invoke the subprocess. The CONFIG_NAME
environment variable specifies the configuration file that is used as an
argument to the config command. The subprocess that is called out uses
the environment variable to identify the configuration file.
The following table describes the callout keyword definitions and the
times at which they are invoked by the config command:
5–48 Configuring the Kernel