Gigabyte GA-EX58-UD5 Manual - Page 118

5-4 POST Error Code POST (hex) CFh C0h C1h C3h C5h 01h 02h 03h 05h 07h 08h 0Ah 0Eh 10h 12h 14h 16h 18h 1Bh 1Dh 23h Description Test CMOS R/W functionality Early chipset initialization: - Disable shadow RAM - Program basic chipset registers Detect memory - Auto-detection of DRAM size, type and ECC Expand compressed BIOS code to DRAM Call chipset hook to copy BIOS back to E000 & F000 shadow RAM Expand the Xgroup codes locating in physical address 1000:0 DualBIOS init (optional) Initial Superio_Early_Init switch 1. Blank out screen 2. Clear CMOS error flag 1. Clear 8042 interface 2. Initialize 8042 self-test 1. Test special keyboard controller for Winbond 977 series Super I/O chips 2. Enable keyboard interface 1. Disable PS/2 mouse interface (optional) 2. Auto detect ports for keyboard & mouse followed by a port & interface swap (optional) 3. Reset keyboard Super I/O chips Test F000h segment shadow to see whether it is R/W -able or not. If test fails, keep beeping the speaker Auto detect flash type to load appropriate flash R/W codes into the run time area in F000 for ESCD & DMI support Use walking 1's algorithm to check out interface in CMOS circuitry. Also set real-time clock power status, and then check for override Program chipset default values into chipset. Chipset default values are MODBINable by OEM customers Initial onboard clock generator if Early_Init_Onboard_Generator is defined See also POST 26h Detect CPU information including brand, SMI type and CPU level Initial interrupts vector table. If no special specified, all H/W interrupts are directed to SPURIOUS_INT_HDLR & S/W interrupts to SPURIOUS_soft_HDLR Initial EARLY_PM_INIT switch 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 GA-EX58-UD5P/UD5 Motherboard - 118 -