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Re: DTS syntax and DTC patches (was: Re: [Qemu-devel] [RFC] Machine desc

From: David Gibson
Subject: Re: DTS syntax and DTC patches (was: Re: [Qemu-devel] [RFC] Machine description as data)
Date: Fri, 13 Feb 2009 13:51:01 +1100
User-agent: Mutt/1.5.18 (2008-05-17)

On Fri, Feb 13, 2009 at 03:45:45AM +0100, Carl-Daniel Hailfinger wrote:
> [Adding the coreboot mailing list to CC. It's moderated for
> non-subscribers, but it won't take long for legitimate mails to be
> approved.]
> On 13.02.2009 03:17, David Gibson wrote:
> > On Fri, Feb 13, 2009 at 03:11:20AM +0100, Carl-Daniel Hailfinger wrote:
> >   
> >> On 13.02.2009 01:43, David Gibson wrote:
> >>     
> >>> On Thu, Feb 12, 2009 at 11:26:46AM +0100, Markus Armbruster wrote:
> >>>   
> >>>       
> >>>> I didn't mean to say they are a bad idea for FDTs, just that they're on
> >>>> an awkward level of abstraction for QEMU configuration.  There, I'd
> >>>> rather express a PCI address as "02:01.0" than as <0x00000220>.
> >>>> Translating text to binary is the machine's job, not the user's.
> >>>>     
> >>>>         
> >>> Ah, I see what you mean.  Hrm, there are several possibilities here,
> >>> we'll have to see which works out best for your purposes.
> >>>       
> >> Using the DTC version included in the coreboot v3 sources would solve
> >> that problem and give you a readable PCI address representation.
> >>     
> >
> > Hrm.. it would be nice if you'd co-ordinated with Jon and I about
> > this.  Then we could have at least the bits which make sense in
> > upstream dtc...
> >   
> Probably the biggest obstacle for a full merge right now is that the
> coreboot v3 DTC is rather old and has been extended not only for a more
> readable DTS syntax variant, but also for additional output modes (C
> header and C code).

If the C output mode is what I'm guessing, it should be pretty easy to
add (we already have an asm output mode upstream).

The syntax changes will be trickier.  I want to review any new syntax
for dts very carefully, because I really, really don't want to have to
break backwards compatibility in future (I'm unhappy enough about the
dts-v0 to dts-v1 transition we've already have).

Can you summarise what the syntax changes are?  Maybe start a new
thread with just devicetree-discuss not the other lists for that.

> We (coreboot developers) are interested in reducing our diff with
> upstream DTC in order to improve maintainability of our DTC code.

Good :)

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_!

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