Information Technology Reference
In-Depth Information
Foundation Summary
The Foundation Summary is a condensed collection of material that provides a convenient
review of key concepts in this chapter. If you are already comfortable with the topics in this
chapter, this summary will help you recall a few details. If you just read the Foundation Topics
section, this review should help solidify some key facts. If you are doing your final preparation
before the exam, these materials are a convenient way to review the day before the exam.
Configuration Register Bit Meanings
Table 3-4
Bit Number
Hex Value
Description
0-3 (boot field)
0x0000 to 0x000f
Select boot characteristics.
Boot field is as follows:
0000—Stay at bootstrap prompt.
0001—Boot image on EPROM.
0002 to 1111—Use the boot system commands in the
configuration; select default network boot filenames.
4
Unused.
5
Unused.
6
0x0040
Causes system to ignore the configuration stored in NVRAM.
7
0x0080
OEM bit enabled.
8
0x0100
When set, the Break key is disabled when system is operating.
If not set, the system enters the bootstrap monitor, halting
normal operation.
9
Unused.
10
0x0400
IP broadcast with all zeros.
11-12
0x0800 to 0x1800
Console line speed.
[12/11] Hex Baud
00 0x0000 9600
01 0x0800 4800
10 0x1000 1200
11 0x1800 2400
13
0x2000
Boots default ROM software if network boot fails.
14
0x4000
IP broadcasts do have network numbers.
15
0x8000
Enables diagnostics messages and ignores NVRAM contents.
 
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