Re: [parisc-linux] How retrieving HPA/SPA with the device node

[Bruno Vidal <bruno_vidal@hpfrcu03.france.hp.com>]

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	Hi
Thanks for the answer, it's clear now. The fact is I'm able 
to retrieve the hpa for a PCI device "only". But for the lazy 
example, I can retrieve the base, but not the hpa. So it would 
be really nice if I can write something usable also on 
712/710/etc.... and not only for PCI system. So I think I'll
forget it at this time, and work only for PCI subsystem (I can still
work on a function that test the kind of scsi card, and do the
reverse job to calculate the hpa from the base, but I'm not sure that
it is the best solution).

	Thanks a lot.

Grant Grundler wrote:
> 
> Bruno Vidal wrote:
> > Can someone can explain what is the difference between the
> > "hpa" of a scsi card (pci or not) and the "base" in the structure Scsi_Host ?
> 
> hpa and base are "handles" for different views of HW.
> "hpa" doesn't have to be a physical address (though it normally is).
> On V-class, the hpa is bogus and just a reference to particular IO device.
> base could be "adjusted" (like the LASI example) or "F-extended"
> for 64-bit or whatever the platform code thinks the driver needs
> to reference the device properly.
> 
> But in practice, for the platforms we support to date, I think you
> can compare them (or compare most of the bits) to determine
> if it's the same device.
> 
> grant
> 
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-- 
	Vidal Bruno, (770-4271)
        SSD-HA Team, HP-UX & LINUX Support
	bruno_vidal@admin.france.hp.com

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