Memory Detection And Configuration; Boot Error Codes; Table 7-2. Boot Error Codes - Compaq Deskpro EXS Technical Reference Manual

7.3.3 MEMORY DETECTION AND CONFIGURATION

This system uses the Serial Presence Detect (SPD) method of determining the installed RIMM
configuration. The BIOS communicates with an EEPROM on each RIMM through the SMBus to
obtain data on the following RIMM parameters:
♦
Presence
♦
Size
♦
Type
♦
PC800 capability
NOTE: Refer to Chapter 3, "Processor/Memory Subsystem" for the SPD format and
RIMM data specific to this system.
The BIOS performs memory detection and configuration with the following steps:
1. Program the buffer strength control registers based on SPD data and the RIMM slots that are
populated.
2. Determine the memory size for each RIMM and program the MCH accordingly.
3. Enable refresh.

7.3.4 BOOT ERROR CODES

The BIOS provides visual and audible indications of a failed system boot by using the keyboard
LEDs and the system speaker. The error conditions are as follows:

Table 7-2. Boot Error Codes

Visual [1]
Num Lock LED blinks
Scroll Lock LED blinks
Caps Lock LED blinks
Num, Caps, Scroll Lock LEDs
blink
Num, Caps, Scroll Lock LEDs
blink in sequence
NOTE:
[1] Provided with PS/2 keyboard only.
Table 7-2. Boot Error Codes
Audible
1 short, 2 long beeps
2 long, 1 short beeps
1 long, 2 short beeps
1 long, 3 short beeps
none
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
Technical Reference Guide
Meaning
System memory not present or incompatible.
Hardware failure before graphics initialization.
Graphics controller not present or failed to
initialize.
ROM failure.
Network service mode
7-5