Specifications

BXT7059 / BXTS7059 Technical Reference Appendix A
Appendix A 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 SHB. 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
A-1 Trenton Systems Inc.