Advantech MIC-6314 Series, User Manual

Page: 116 / 136

MIC-6314 User Manual 104
A status code is a data value used to indicate progress during the boot phase. A sub-
set of these status codes, known commonly as checkpoints, indicates common
phases of the BIOS boot process.
Checkpoints are typically output to I/O port 80h, but the Aptio 4.x core can be config-
ured to send status codes to various locations. The Aptio 4.x core outputs check-
points throughout the boot process to indicate the task the system is currently
executing. Checkpoints are very useful to software developers and technicians for
debugging problems that occur during the pre-boot process.
While performing the functions of the traditional BIOS, the Aptio 4.x core follows the
firmware model described in the Intel
®
Platform Innovation Framework for EFI. This
framework refers the following “boot phases”, which may apply to various status code
and descriptions:
 Security (SEC) – initial low-level initialization
 Pre-EFI Initialization (PEI) – memory initialization
 Driver Execution Environment (DXE) – main hardware initialization
 Boot Device Selection (BDS) – system setup, pre-OS user interface and
bootable device selection (CD/DVD, HDD, USB, Network, Shell)
E.1 Checkpoint Ranges/Descriptions
Status Code Range Description
0x01 – 0x0B SEC execution
0x0C – 0x0F SEC errors
0x10 – 0x2F PEI execution up to and including memory detection
0x30 – 0x4F PEI execution after memory detection
0x50 – 0x5F PEI errors
0x60 – 0x8F DXE execution up to BDS
0x90 – 0xCF BDS execution
0xD0 – 0xDF DXE errors
0xE0 – 0xE8 S3 resume (PEI)
0xE9 – 0xEF S3 resume errors (PEI)
0xF0 – 0xF8 Recovery (PEI)
0xF9 – 0xFF Recovery errors (PEI)