Re: [Qemu-devel] [PATCH 00/10] Fix versatile_pci (and break versatilepb linux guests!)

[Arnd Bergmann]

On Sunday 24 March 2013, Peter Maydell wrote:
> OK, I'll give that a go tomorrow.
> 
> While you're here, do you know what the point of the PCI_SELFID
> register is? The h/w docs are clear that the OS has to write
> the slot number of the board itself in to this register, but
> again I don't see why the OS has to tell the hardware something
> it already knows. On QEMU I just implemented this register as
> a no-op and everything seems to still function...
> 

I don't know really, but I think it has something to do with the
versatile board being plugged into a backplane that has multiple
slots. Apparently there is something the hardware cannot figure
out itself, e.g. whether to route the interrupts in or out of the
slot.

        Arnd