Compaq AlphaPC 164LX - Manual (Page 48)

7–6 Alpha SRM Console Firmware
Basic Alpha SRM Console Command Descriptions
Description
The boot command initializes the processor, loads a program image
from the specified boot device, and transfers control to that image. If
you do not specify a boot device in the command line, the default
boot device is used. The default boot device is determined by the
value of the bootdef_dev environment variable.
If you specify a list of devices, a bootstrap is attempted from each
device in the order in which the device is listed. Then control passes
to the first successfully booted image. In a list, always enter network
devices last because network bootstraps terminate only if a fatal error
occurs or if an image is successfully loaded.
The -flags option can pass additional information to the operating
system about the boot that you are requesting. On an OpenVMS
system, the
-flags option specifies the system root number and
boot flags. If you do not specify a boot flag qualifier, the default boot
flag’s value specified by the boot_osflags environment variable is
used.
The -protocols option allows selection of either the DECnet
MOP or the TCP/IP BOOTP network protocols. The keywords mop
and bootp are valid arguments for this option. It is possible to set the
default protocol for a port by setting the environment variable
ewa0_protocols or era0_protocols to the appropriate protocol.
Explicitly stating the boot flags or the boot device overrides the
current default value for the current boot request, but does not change
the corresponding environment variable.
See the Environment Variables for Alpha SRM Console Commands
section in this chapter for more information about environment
variables.