Multi-function support in PCI

Hello,

In case of PCI, I am having some doubts for supporting multiple functions.

The multiple function is enabled by setting bit 7 in Header Type field of configuration space.

Each function should have seperate configuration space.

At a time 8 functions can be supported at the max.

Now the doubt is:

How the system comes to know how many functions are supported by the device?

If the Bit 7 in Header type of first fuction is 1 but that of other functions is 0 or otherwise,

how all the functions can be assecced?

If the device is supporting only 3 functions, whether the BIOS will run the configuration cycles assuming

that the device is supporting 8 functions or it knows where to stop for programming the base address registers.

***** Madhura Bokil. *****
ControlNet (I) Pvt. Ltd;
Project Engineer,
Verna - Goa
Goa - 403 722.
Ph. 0832-783615