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Subject: Re: DT case sensitivity
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Rob Herring <robh@kernel.org>
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On Wed, 2018-08-22 at 20:26 -0500, Rob Herring wrote:
> On Wed, Aug 22, 2018 at 8:14 PM Benjamin Herrenschmidt
> <benh@kernel.crashing.org> wrote:
> > 
> > On Wed, 2018-08-22 at 19:47 -0500, Rob Herring wrote:
> > > The default DT string handling in the kernel is node names and
> > > compatibles are case insensitive and property names are case sensitive
> > > (Sparc is the the only variation and is opposite). It seems only PPC
> > > (and perhaps only Power Macs?) needs to support case insensitive
> > > comparisons. It was probably a mistake to follow PPC for new arches
> > > and we should have made everything case sensitive from the start. So I
> > > have a few questions for the DT historians. :)
> > 
> > Open Firmware itself is insensitive.
> 
> Doesn't it depend on the implementation? Otherwise, how is Sparc different?

Not sure ... Forth itself is insensitive for words but maybe not for
string comparisons.

> 
> > > What PPC systems are case insensitive? Can we limit that to certain systems?
> > 
> > All PowerMacs at least, the problem is that I don't have DT images or
> > access to all the historical systems (and yes some people occasionally
> > still use them) to properly test a change in that area.
> 
> I'm temped to break them so I can find folks to provide me with DT dumps. :)

I have a collection of DT dumps but I'm not sure about the legality of
publishing them...

Cheers,
Ben.