How to access the pci configuration space ?

[malcolm_119]

access pci configuration space dos

I need to test the PCI board under DOS , but I don't know how to access the pci
configuration register.

Knowing this will be of help to me in my routine.
Thanks

 

[echo47]

I haven't done that in many years, but try searching for info describing BIOS 0x1A calls such as these:

PCI_READ_CONFIG_BYTE 0xB108
PCI_READ_CONFIG_WORD 0xB109
PCI_READ_CONFIG_DWORD 0xB10A
PCI_WRITE_CONFIG_BYTE 0xB10B
PCI_WRITE_CONFIG_WORD 0xB10C
PCI_WRITE_CONFIG_DWORD 0xB10D

You can probably find example code by searching Google for some of those keywords. Here's a web page with parameter details:
http://www.delorie.com/djgpp/doc/rbinter/ix/1A/B1.html

Also very helpful: "PCI BIOS Specification Revision 2.1":
**broken link removed**

 

[malcolm_119]

Thanks a lot !

The two links are very important ~～

 

[buenos]

use the "hardware direct" software. it can access to the config space, memory space, IO space.
I was using it to test my PCI card.
But of course, the software guys will have to drive a "real" driver.

there is a pci sniffer software, it boots instead of OS, you can read, but not write the PCI card config regs

 

[buenos]

one more thing:

in the IO space, there is a PCI config Address, and a PCI config data register. with those, you can access to the config space, in a driver software.

 

[malcolm_119]

one more thing:

in the IO space, there is a PCI config Address, and a PCI config data register. with those, you can access to the config space, in a driver software.

With your help , I have found the add. reg & data reg (0xCF8 0xCFC )
Thanks !