A question about the use of PCI configuration Space

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yx.yang

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Hi, ALL:
I have a question about the PCI configuration space.
The PCI Spec. defined a 256 byte configuration space and it use the first 64 bytes as all PCI devices' common conf regs.
My question is: Can I define and add addition configuration reg to the space between 0x40 - 0xFF. And will this cause any compatibility problme?

Thanks in advance.
 

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