Re: [PATCH 03/03] ARM: Undelete KZM9D mach-type

From: Arnd Bergmann
Date: Tue May 15 2012 - 15:09:52 EST

On Tuesday 15 May 2012, Grant Likely wrote:
> On Tue, 15 May 2012 08:32:09 +0000, Arnd Bergmann <arnd@xxxxxxxx> wrote:
> > On Monday 14 May 2012, Magnus Damm wrote:
> > > Right, I agree. Relying on a fixed DTB in an unreliable boot loader is
> > > the last thing I want to do.
> > >
> > > So if your boot loader can't pass DTB to the kernel, and you want to
> > > have a single kernel supporting multiple boards, then do you see
> > > anything wrong with based on mach-type do a run time decision (in
> > > arch/arm/boot/compressed/) to override the ATAG from the boot loader
> > > with a compiled-in per-board DTB?
> >
> > I know that we have discussed this in the past, but I don't remember
> > the outcome of the discussion, maybe someone else can help out here
> > (Grant?)
> >
> > It's definitely technically possible to do it, but it could either be
> > that nobody has bothered to do the implementation, or that we had good
> > reasons against it and decided not to allow this.
> Tony and I talked about this quite a bit during the last Connect. The
> plan is to extend the existing bootwrapper ATAGs to DT code to allow
> appending multiple .dtbs to the zImage and selecting the correct one
> based on the machine number. It shouldn't be very complicated, but I
> haven't had time to implement it.

Ok, good. so you are both on the same page then, Grant and Magnus.
I suppose you just need to coordinate then who is doing the work,
and it seems that Magnus is eager to prototype this.

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