Accessing PCI devices

Hello,

I'm developping a micro OS for PC, for learning
purpose and I have started to "play" with PCI devices.

So I have written a small piece of code that read the
Vendor ID and Device ID of the Device 0, Fiunction 0
on Bus 0.

When My piece of code run nativly on my PC, it
displays the good device and vendor ID (For instance,
Intel for vendor ID).

But when I run this piece of code on bochs, it
displays 0xFFFF for Vendor ID and 0xFFFF for Device
ID. It seems my piece of code access nothing and I'm
sure bochs emulates some PCI devices.

I think I do not initialize correctly my PCI
subsystem. I write '1' in bit 31 of CONFADD (0xCF8
port), and that run on the PC. Maybe my PC bios do
some initialization bochs do not.

Any ideas, clues, answer ?

Thank you very much

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