Subject: talking to PCI bridges from device drivers
To: None <firstname.lastname@example.org>
From: Michael Richardson <email@example.com>
Date: 01/10/1999 19:05:25
I have a PCI device with a DEC 21150 PCI/PCI bridge that uses the GPIOx
pins for a specific purpose. Is there some way to find the right pcitag_t for
the bridge that the driver for my chip is actually behind?
I know this sort of violates layering, but I already had that conversation
with the hardware designers.
So, given a "busnum" is there a way to generate the right pcitag_t for the
bridge onto that bus? Obviously, it fails for busnum 0.
Is this a reasonable thing to add to pci_machdep.c?
hmm. not even sure where the root pcitag_t get's created...
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