Re: [Qemu-ppc] [PATCH 2/3] ppc/pnv: add a PnvChip object

[David Gibson]

On Sat, Aug 06, 2016 at 08:43:21AM +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2016-08-05 at 18:48 +0200, Cédric Le Goater wrote:
> > The core initialization should be ok but building the device 
> > tree might be a bit of a burden if we have to 'cast' in the chip 
> > type we need. We will see.
> 
> We don't cast, we use a method.

Right.  You can have a look at the sPAPR VIO stuff for an example
where we use a method in the individual devices to do the device
specific fdt construction.

> 
> > So what would be the big differences with what we have today ?   
> 
> The XSCOM controller has a different address decoding scheme, so
> we'll have two variants and a base class there. The number and
> location of functional units changes, so we'll probably need to make
> them properties or something, the core XSCOM addressing is completely
> different, we use PHB4 rather than PHB3, etc...
> 
> (Note that for PHB we should probably rename PHB3 to PnvPhb with a
> subclass as well as there is a lot in common between the two, though
> the PBCQ bit is quite different).
> 

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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