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List:       linux-kernel
Subject:    Re: Fwd: Patch to control VGA bus routing and active VGA device.
From:       Grant Grundler <grundler () parisc-linux ! org>
Date:       2005-01-28 20:12:00
Message-ID: 20050128201200.GE32135 () colo ! lackof ! org
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On Fri, Jan 28, 2005 at 11:41:16AM -0800, Jesse Barnes wrote:
> Yeah, I think I understand.  We could probably do the same thing on sn2
> as you do on parisc--add a 'segment 0' offset to the port so that it's routed 
> correctly.  I think that's a little less flexible than adding a new resource 
> though, since it makes it harder for drivers to support more than one device 
> or devices on non-segment 0 busses.

To be clear, the parisc code defines this in include/asm-parisc/pci.h:

#define HBA_PORT_SPACE_BITS     16
#define PCI_PORT_HBA(a)    ((a) >> HBA_PORT_SPACE_BITS)

and PCI_PORT_HBA gets used in arch/parisc/kernel/pci.c.

Offhand, I don't know if ia64 has the equivalent.
But it sounds like it might need it.

grant
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