Virtual Configuration Register Settings
3
Hardware Installation Guide
B-3
Hardware User’s Guide
B.1.1 Changing Configuration Register Settings
Some common reasons to modify the value of the virtual configuration register
follow:
•
Recover a lost password
•
Change the console baud rate
•
Enable or disable Break
•
Allow you to manually boot the operating system using the b command at the
bootstrap program (ROM monitor) prompt
•
Force the CRBRIM-W/E to boot automatically from the system bootstrap
software (boot ROM image) or from its system image in Flash memory, and
read any boot system commands that are stored in the configuration file in
NVRAM. If the CRBRIM-W/E finds no boot system commands, it uses the
configuration register value to form a filename from which to netboot a
default system image stored on a network server. (See Table B-3.)
To change the configuration register while running the system software, follow
these steps:
Table B-2. Explanation of Boot Field
(Configuration Register Bits 00 to 03)
Boot
Field
Meaning
00
Stays at the system bootstrap prompt
01
Boots system image in system ROM
02 to 0F
Specifies a default netboot filename
Enables boot system commands that override default netboot
filename
Summary of Contents for CRBRIM-W/E
Page 1: ...CRBRIM W E USER S GUIDE ...
