confused about PCI addresses...

[Norbert Roos <n.roos@berlin.de>]

Hello!

I'm getting more and more confused about PCI addresses and related
things. Documentation/IO-mapping does not help at these questions..
Maybe anyone has got a hint or a link?

- The base address of a PCI device which i read from the config space:
Is this a bus or a physical address? (I guess a bus address)

- Does ioremap() take a physical or a bus address as an argument? (In
other words: what kind of conversion do i have to make if i want to map
the PCI device into the process' memory space?)

- What type of address is used with out[bwl]()?

- And what type is it with write[bwl]()? What is the difference to
out()? (As far as i understand out() is an IO port access - that leads
to the next question)

- What is the difference between a memory mapped address and an IO port?
I never find any explanations, only that there are these two types of
access...

bye!

Norbert
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