[no subject]

Thinking about it some more, though, this probably doesn't integrate well 
with syscons.  8(

I'm kinda stumped, here.  I don't think there's a clean way to do this, 
which is bad.  We probably need to fix this.  Thoughts?

> I'm trying to port an Alpha video driver (TGA) from -stable to
> -current and have run into a problem converting some calls to
> pci_cfgread() and pci_cfgwrite().
> 
> The Alpha firmware reports the location of the console video card as a
> physical hose, bus type, bus, slot value.  In -stable, the card can be
> accessed by calling pci_cfg{read,write}() with this information.
>
> In -current, pci_cfg{read,write}() have been replaced by
> pci_{read,write}_config(), but the latter function needs a device_t
> structure that defines both the device and it's parent.
> Unfortunately, I don't have the relevant device_t available.  In any
> case, based on my reading of the code, I need to access the PCI config
> registers before the video card has been probed/attached via the
> normal bus/device scan.
> 
> Luckily, there's only one point at which I need this `physical' access.
> The call backtrace is:
> 	pci_cfg{read,write}()
> 	tga_configure()
> 	vid_configure()
> 	scvidprobe()
> 	sccnattach()
> 	<<system_specific>>_cons_init()
> 	alpha_init()
> 	...
> 
> Does anyone have any useful suggestions?[1]  Is there an `approved'
> mechanism to bypass the bus abstraction layers?  Is is practical to
> hand-craft a device_t that will satisfy pci_{read,write}_config()?
> 
> [1] I don't count "throw out the TGA" as a useful suggestion.
> 
> Peter
> 
> 
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