Please help me to understand the interaction of the various ATA drivers

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Jeff,

I don't know if you're still the maintainer of these drivers but you're
listed as the original author of the code in the 2.6 kernel which I'm
working on modifying.  I have to write a driver which I can expose
access to the various HBA and Port registers for an AHCI class HBA.  In
addition, this driver must act as a pass through driver for my clients
to be able to execute ATA commands.  I'd like for it to be a true pass
through driver and not have to run through the kernel's schedules and
such, but that's another discussion.

My question for you is simply, how are these various drivers supposed to
work together?  On the VM which I'm doing my development, I see the
following from lsmod:

# lsmod
...
ahci                      41208         2
pata_acpi                  3701         0
ata_generic                3837         0
ata_piix                  24409         1
...


This at least shows me that none of these modules depend upon one
another for functionality.  However, to some level, they must be
interrelated.  

Thanks for any light you can shed on this for me.

Andy
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