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Intel Core 2 Duo Processor and Intel Q35 Express Chipset—Setting Up and Configuring the
Development Kit
Intel
®
Core
TM
2 Duo Processor and Intel
®
Q35 Express Chipset Development Kit
User’s Manual October 2007
32 Order Number: 318476001US
3.5 Post Codes Definitions
The CRB BIOS writes progress and error codes to Port 80 during POST. These codes are
defined below.
3.5.1 Normal Post Codes
Uncompressed INIT code checkpoints
Before D1 – Early chipset and SIO initialization. NMI disabled.
D1 Perform keyboard controller BAT test. Save power-on CPUID to
scratch CMOS.
D0 Go to flat mode with 4GB limit. Start checksum verification.
D2 Disable cache and begin sizing full memory array.
D3 Additional chipset initialization, re-enable cache.
D4 Test base 512 MB of memory, adjust policies and cache first 8
MB.
D5 Bootblock code copied from ROM to lower system memory. BIOS
now executes out of RAM.
D6 Check for recovery mode and verify main BIOS checksum.
If either in recovery mode or main BIOS checksum is bad, go to check point E0
else goto checkpoint D7.
Figure 24. 2x12 Standard power supply and 2x2 power supply
Power-on button
2x12 Standard
power supply
2x2 Standard
power supply