Gigabyte GA-890FXA-UD7 User Manual page 116

POST (hex)
24h
25h
26h
27h
29h
2Bh
2Dh
33h
35h
37h
39h
3Ch
3Eh
40h
43h
47h
49h
4Eh
50h
52h
53h
55h
57h
Appendix
Description
Prepare BIOS resource map for PCI & PnP use. If ESCD is valid, take into consider-
ation of the ESCD's legacy information
Early PCI initialization:
- Enumerate PCI bus number
- Assign memory & I/O resource
- Search for a valid VGA device & VGA BIOS, and put it into C000:0
1. If Early_Init_Onboard_Generator is not defined Onboard clock generator initializa-
tion. Disable respective clock resource to empty PCI & DIMM slots
2. Init onboard PWM
3. Init onboard H/W monitor devices
Initialize INT 09 buffer
1. Program CPU internal MTRR for 0-640K memory address
2. Initialize the APIC for Pentium class CPU
3. Program early chipset according to CMOS setup Example: onboard IDE controller
4. Measure CPU speed
Invoke video BIOS
1. Initialize double-byte language font (optional)
2. Put information on screen display, including Award title, CPU type, CPU speed, full
screen logo
Reset keyboard if Early_Reset_KB is defined e.g. Winbond 977 series Super I/O
chips. See also POST 63h
Test DMA Channel 0
Test DMA Channel 1
Test DMA page registers
Test 8254
Test 8259 interrupt mask bits for channel 1
Test 8259 interrupt mask bits for channel 2
Test 8259 functionality
Initialize EISA slot
1. Calculate total memory by testing the last double word of each 64K page
2. Program write allocation
1. Program MTRR of M1 CPU
2. Initialize L2 cache for P6 class CPU & program CPU with proper cacheable range
3. Initialize the APIC for P6 class CPU
4. On MP platform, adjust the cacheable range to smaller one in case the cacheable
ranges between each CPU are not identical
Initialize USB Keyboard & Mouse
Test all memory (clear all extended memory to 0)
Clear password according to H/W jumper (optional)
Display number of processors (multi-processor platform)
1. Display PnP logo
2. Early ISA PnP initialization
- Assign CSN to every ISA PnP device
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