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Affected System Resources and Addresses

Table 1 lists the system resources and associated I/O addresses that should not be directly accessed by BIOS AML code (the "blocked ports" list).

Table 1 Blocked I/O Port Addresses and System Board Resources

Address Function Comments

0x000 0x00F

DMA Controller 1

 

0x020 0x021

Programmable Interrupt Controller

Access is never allowed*

0x040 0x043

System Timer 1

 

0x048 0x04B

Timer 2 Failsafe

 

0x070 0x071

System CMOS, RTC

 

0x074 0x076

Extended CMOS

 

0x081 0x083

DMA1 Page Registers

 

0x087

DMA1 CH0 Low Page

 

0x089

DMA2 CH2 Low Page

 

0x08A 0x08B

DMA2 CH3 Low Page,

 

0x08F

DMA2 Low Page Refresh

 

0x090 0x091

Arbitration Control Port Card Select Feedback

 

0x093 0x094

Reserved System Board Setup

 

0x096 0x097

POS Channel Select

 

0x0A0 0x0A1

Cascaded Programmable Interrupt Controller

Access is never allowed*

0x0C0 0x0DF

ISA DMA

 

0x4D0 0x4D1

PIC Edge/Level Control Registers

Access is never allowed*

0xCF8 0xD00

PCI Configuration Space Access

 

*Read or write accesses to these ports are always blocked, regardless of the BIOS use of the _OSI method.

posted on 2007-03-12 17:23 yuhen 阅读(994) 评论(2)  编辑 收藏 引用 所属分类: 技术文档

FeedBack:
# re: Blocked I/O Port Addresses and System Board Resources
2008-08-12 10:32 | FLX
There are some more ports blocked.

Where do you get this table?  回复  更多评论
  
# re: Blocked I/O Port Addresses and System Board Resources [未登录]
2008-08-12 16:45 | eric
From BIOS AML code   回复  更多评论
  
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