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1、 AMIBIOS8 Check Point and Beep Code List Version 1.2, Last Updated 1 October 2002 American Megatrends, Inc. AMIBIOS8 Check Point and Beep Code List Copyright (c) 2002 American Megatrends, Inc. All Rights Reserved. American Megatrends, Inc. 6145-F, Northbelt Parkway Norcross, GA - 30071, USA This pub
2、lication contains proprietary information which is protected by copyright. No part of this publication may be reproduced, transcribed, stored in a retrieval system, translated into any language or computer language, or transmitted in any form whatsoever without the prior written consent of the publi
3、sher, American Megatrends, Inc. American Megatrends, Inc. retains the right to update, change, modify this publication at any time, without notice. For Additional Information Call American Megatrends BIOS Sales Department at 1-800-828-9264 for additional information. Limitations of Liability In no e
4、vent shall American Megatrends be held liable for any loss, expenses, or damages of any kind whatsoever, whether direct, indirect, incidental, or consequential, arising from the design or use of this product or the support materials provided with the product. Limited Warranty No warranties are made,
5、 either express or implied, with regard to the contents of this work, its merchantability, or fitness for a particular use. American Megatrends assumes no responsibility for errors and omissions or for the uses made of the material contained herein or reader decisions based on such use. Trademark an
6、d Copyright Acknowledgments All product names used in this publication are for identification purposes only and are trademarks of their respective Companies. Revision Information Date Rev Description of Changes Editor 7 May 2002 1.0 First Public Release for AMIBIOS8 B. Richardson 8 May 2002 1.1 Adde
7、d beep code troubleshooting information. B. Richardson 1 Oct 2002 1.2 Added CPU and ACPI POST codes D. Holmberg Copyright 2002 Page 2 of 12 American Megatrends, Inc. AMIBIOS8 Check Point and Beep Code List Table of Contents 1 INTRODUCTION 4 1.1 About This Document 4 1.2 Checkpoints and Beep Codes 4
8、1.3 Viewing BIOS Checkpoints 4 2 BOOTBLOCK INITIALIZATION CODE CHECKPOINTS 5 3 BOOTBLOCK RECOVERY CODE CHECKPOINTS 6 4 POST CODE CHECKPOINTS 7 5 DIM CODE CHECKPOINTS 9 6 ACPI RUNTIME CHECKPOINTS 11 7 BEEP CODES 12 7.1 Troubleshooting BIOS Beep Codes 12 Copyright 2002 Page 3 of 12 American Megatrends
9、, Inc. AMIBIOS8 Check Point and Beep Code List 1 Introduction 1.1 About This Document This document lists checkpoints and beep codes generated by AMIBIOS. This document was last revised at the release of AMIBIOS8 Core 8.00.04. This covers AMIBIOS products released before May 2002. The checkpoints de
10、fined in this document are inherent to the AMIBIOS generic core, and do not include any chipset or board specific checkpoint definitions. 1.2 Checkpoints and Beep Codes A checkpoint is either a byte or word value output to I/O port 80h. The BIOS outputs checkpoints throughout bootblock and Power-On
11、Self Test (POST) to indicate the task the system is currently executing. Checkpoints are very useful in aiding software developers or technicians in debugging problems that occur during the pre-boot process. Beep codes are used by the BIOS to indicate a serious or fatal error to the end user. Beep c
12、odes are used when an error occurs before the system video has been initialized. Beep codes will be generated by the system board speaker, commonly referred to as the “PC speaker.” 1.3 Viewing BIOS Checkpoints Viewing all checkpoints generated by the BIOS requires a checkpoint card, also referred to
13、 as a “POST Card” or “POST Diagnostic Card”. These are ISA or PCI add-in cards that show the value of I/O port 80h on a LED display. Checkpoint cards are available through a variety of computer mail-order outlets. Some computers using AMIBIOS display checkpoints in the bottom right corner of the scr
14、een during POST. This display method is limited, since it only displays checkpoints that occur after the video card has been activated. Keep in mind that not all computers using AMIBIOS enable this feature. In most cases, a checkpoint card is the best tool for viewing AMIBIOS checkpoints. Copyright
15、2002 Page 4 of 12 American Megatrends, Inc. AMIBIOS8 Check Point and Beep Code List 2 Bootblock Initialization Code Checkpoints The Bootblock initialization code sets up the chipset, memory and other components before system memory is available. The following table describes the type of checkpoints
16、that may occur during the bootblock initialization portion of the BIOS: Checkpoint Description Before D1 Early chipset initialization is done. Early super I/O initialization is done including RTC and keyboard controller. NMI is disabled. D1 Perform keyboard controller BAT test. Check if waking up from power management suspend state. Save power-on CPUID value in scratch CMOS. D0 Go to flat mode with 4GB limit and GA20 enabled. Verify the bootblock checksum. D2 Disable CACHE before memory detec
