MBT8301 Technical Reference
Trenton Systems, Inc.
9
Chapter 5 | BIOS Messages
Introduction
A status code is a data value used to indicate progress during the boot phase. These codes are outputted to I/O port
80h on the MBC8240 card. Aptio 4.x core outputs checkpoints throughout the boot process to indicate the task the
system is currently executing. Status codes are very useful in aiding software developers or technicians in
debugging problems that occur during the pre-boot process.
Aptio Boot Flow
While performing the functions of the traditional BIOS, Aptio 4.x core follows the firmware model described by the
Intel Platform Innovation Framework for EFI (“the Framework”). The Framework refers the following “boot
phases”, which may apply to various status code descriptions:
Security (SEC) – initial low-level initialization
Pre-EFI Initialization (PEI) – memory initialization
1
Driver Execution Environment (DXE) – main hardware initialization
2
Boot Device Selection (BDS) – system setup, pre-OS user interface & selecting a bootable device
(CD/DVD, HDD, USB, Network, Shell, …)
1
Analogous to “bootblock” functionality of legacy BIOS
2
Analogous to “POST” functionality in legacy BIOS
BIOS Beep Codes
The Pre-EFI Initialization (PEI) and Driver Execution Environment (DXE) phases of the Aptio BIOS use audible
beeps to indicate error codes. The number of beeps indicates specific error conditions.
PEI Beep Codes
# of Beeps
Description
1
Memory not Installed
1
Memory was installed twice (InstallPeiMemory routine in PEI Core called twice)
2
Recovery started
3
DXEIPL was not found
3
DXE Core Firmware Volume was not found
7
Reset PPI is not available
4
Recovery failed
4
S3 Resume failed
Содержание MBT8301 Series
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