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Gigabyte Gag1975xc Manual

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Page 101

Appendix - 101 -
English4-3 POST Error Code
 POST (hex)Description
 CFh Test CMOS R/W functionality
 C0h Early chipset initialization:
- Disable shadow RAM
- Disable L2 cache (socket 7 or below)
- Program basic chipset registers
 C1h 1. Detect memory
    - Auto-detection of DRAM size, type and ECC
    - Auto-detection of L2 cache (socket 7 or below)
 2. PEG slots Auto-Configuration
 C3h Expand compressed BIOS code to DRAM
 C5h Call chipset hook to copy BIOS back to E000 & F000 shadow RAM
 0h1 Expand the...

Page 102

GA-G1975X-C Motherboard - 102 -
English
 POST (hex)Description
 1Dh Initial  EARLY_PM_INIT  switch
 1Fh Load keyboard matrix (notebook platform)
 21h HPM initialization (notebook platform)
 23h 1. Check validity of RTC value:
    e.g. a value of 5Ah is an invalid value for RTC minute
2. Load CMOS settings into BIOS stack. If CMOS checksum fails,
    use default value instead.
3. Prepare BIOS resource map for PCI & PnP use. If ESCD is valid,
    take into consideration of the ESCDs legacy information
4....

Page 103

Appendix - 103 -
English POST (hex)Description
 50h Initialize USB
 52h Test all memory (clear all extended memory to 0)
 55h Display number of processors (multi-processor platform)
 57h 1. Display PnP logo
2. Early ISA PnP initialization
- Assign CSN to every ISA PnP device
 59h  Initialize the combined Trend Anti-Virus code
 5Bh (Optional Feature)
Show message for entering AWDFLASH.EXE from FDD (optional)
 5Dh 1. Initialize Init_Onboard_Super_IO switch
2. Initialize Init_Onbaord_AUDIO switch
 60h Okay...

Page 104

GA-G1975X-C Motherboard - 104 -
English
 POST (hex)Description
 82h 1. Call chipset power management hook
2. Recover the text fond used by EPA logo (not for full screen logo)
3. If password is set, ask for password
 83h Save all data in stack back to CMOS
 84h Initialize ISA PnP boot devices
 85h 1. USB final Initialization
2. NET PC: Build SYSID structure
3. Switch screen back to text mode
4. Set up ACPI table at top of memory
5. Invoke ISA adapter ROMs
6. Assign IRQs to PCI devices
7. Initialize APM
8....

Page 105