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How to write a driver for a device behind two bridges (PCI cards)?

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ubuntu_amateur

ubuntu_amateur

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how to expand PCI bus?

As shown as below,
The intention is that Card A is plugged into the PCI slot of PC motherboard;
and, Card B is plugged into the PCI slot of Card A.
Card A is a bridge, also Card B is a bridge.
that is for performing the expansion of PCI bus.

PC-----PCI card(A)-----PCI card(B)


Questions are:
WindowsXP and Linux operating system support them?
Why OS can't recognize the device connected to Card B behind Card A?


Any hints will be appreciated!
 

PCI expansion issues

that means how to write a driver for a device behind 2 bridge.
 

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