Instruction manual

16.4 Console Commands

The console program supports these commands:

Command Description

BOOT Initiates the bootstrap process.

CONTINUE Returns operating system from console to program mode.

DEPOSIT Writes to memory, I/O, and register locations.

EXAMINE Displays speciﬁc memory, I/O, and register locations.

HALT Halts the current program and places the system from program mode to

console mode.

HELP Displays basic help ﬁle.

REPEAT Repeats commands.

SET[ENV] Sets an environment variable.

SHOW Shows an environment variable.

START Starts CPU at a given address.

TEST Runs diagnostics.

! Precedes a comment on a command line.

16.4.1 BOOT

The BOOT command bootstraps the operating system.

>>> B[OOT] [device_name] [qualifier]

The ﬁrmware initializes the processor, loads a program image from the speciﬁed

boot device, and transfers control to that image. If no boot device is speciﬁed in

the command line, the default boot device is used.

If a list of devices is speciﬁed, a bootstrap is attempted from each device in turn

and then transfers control to the ﬁrst successfully booted image. In a list network

devices should always be placed last, since network bootstraps only terminate if a

fatal hardware error occurs or an image is successfully loaded

The console qualiﬁes the bootstrap with the -ﬂ option. In the case where no

boot ﬂag option is speciﬁed, the corresponding default boot ﬂag value is used.

Explicitly naming either the boot ﬂags or boot device overrides the current

default value for the current boot request, but does not change the corresponding

default value in NVR.

Console 16–7