Trinity KT400 S2495
Appendix II: Post Error Code for BIOS
5-9
http://www.tyan.com
POST (hex)
Description
24h:
Prepare BIOS resource map for PCI & PnP use. If ESCD is valid, take
into consideration of the ESCD’s legacy information.
25h:
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
26h:
1. If Early_Init_Onboard_Generator is not defined Onboard clock
generator initialization. Disable respective clock resource to empty PCI
& DIMM slots.
2. Init onboard PWM
3. Init onboard H/W monitor devices
27h:
Initialize INT 09 buffer
28h:
Reserved
29h:
1. Program CPU internal MTRR (P6 & PII) 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.
2Ah:
Reserved
2Bh:
Invoke Video BIOS
2Ch:
Reserved
2Dh:
1. Initialize double-byte language font (Optional)
2. Put information on screen display, including Award title, CPU type,
CPU speed, full screen logo.
2Eh:
Reserved
2Fh:
Reserved
30h:
Reserved
31h:
Reserved
32h:
Reserved
33h:
Reset keyboard if Early_Reset_KB is defined e.g. Winbond 977 series
Super I/O chips. See also POST 63h.
34h:
Reserved
35h:
Test DMA Channel 0
