EPOX EP-6VBA Uživatelský manuál stáhnout pdf (Strana 53)

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POST CODESPOST CODES

POST CODES

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(Debug Card)(Debug Card)

(Debug Card)

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

POST (hex)POST (hex)

POST (hex)

DESCRIPTIONDESCRIPTION

DESCRIPTION

01-02 Reserved.

C0 Turn off OEM specific cache, shadow.

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

2. Initialize all the standard devices with

default values Standard devices includes.

- DMA controller (8237)C

- Programmable Interrupt Controller (8259)C

- Programmable Interval Timer (8254)C

- 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 that POST 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.

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 66 67

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