EPOX EP-6VBA Specifications download pdf (Page 61)

Appendix

EP-6VBA

A-5

Appendix B

B-1 POST CODES

ISA POST codes are typically output to I/O port address 80h.

POST (hex) DESCRIPTION

01-02 Reserved.

C0 Turn off OEM specific cache, shadow.

03 1. Initialize EISA registers (EISA BIOS only).

2. Initialize all the standard devices with default values

Standard devices includes.

- DMA controller (8237).

- Programmable Interrupt Controller (8259).

- Programmable Interval Timer (8254).

- RTC chip.

04 Reserved

05 1. Keyboard Controller Self-Test.

06 2. Enable Keyboard Interface.

07 Reserved.

08 Verifies CMOS's basic R/W functionality.

C1 Auto-detection of onboard DRAM & Cache.

C5 Copy the BIOS from ROM into E0000-FFFFF shadow RAM so

thatPOST will go faster.

08 Test the first 256K DRAM.

09 OEM specific cache initialization. (if needed)

0A 1. Initialize the first 32 interrupt vectors with corresponding

Interrupt handlers. Initialize INT numbers from 33-120 with

Dummy (Spurious) Interrupt Handler.

2. Issue CPUID instruction to identify CPU type.

3. Early Power Management initialization. (OEM specific)

0B 1. Verify the RTC time is valid or not.

2. Detect bad battery.

3. Read CMOS data into BIOS stack area.

4. PnP initializations including. (PnP BIOS only)

- Assign CSN to PnP ISA card.

- Create resource map from ESCD.

5. Assign IO & Memory for PCI devices. (PCI BIOS only)

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EPOX EP-6VBA Specifications Page 61