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[XenPPC] [RFC] consolidated libdt proposal

To: "Mark A. Greer" <mgreer@xxxxxxxxxx>
Subject: [XenPPC] [RFC] consolidated libdt proposal
From: Hollis Blanchard <hollisb@xxxxxxxxxx>
Date: Mon, 07 Aug 2006 16:58:41 -0500
Cc: Pantelis Antoniou <pantelis@xxxxxxxxxxxxxxxxx>, "xen-ppc-devel@xxxxxxxxxxxxxxxxxxx" <xen-ppc-devel@xxxxxxxxxxxxxxxxxxx>, linuxppc-dev@xxxxxxxxxx, Haren Myneni <haren@xxxxxxxxxx>, linuxppc-embedded <linuxppc-embedded@xxxxxxxxxx>, Jon Loeliger <jdl@xxxxxxxxxxxxx>
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On Sun, 2006-08-06 at 19:38 -0500, Hollis Blanchard wrote:
> Hmm, so we'll have at least three copies of this code: uboot, kernel,
> and Xen. Would it make sense to put this stuff into a libdt.a?
> Technically, dtc has a "libdt" already, but it's absurdly incomplete
> (I don't even know why it's there), so we could just replace it. 

Mark, I had a look at the code Pantelis wrote for u-boot, and it was
pretty easy to adapt to meet Xen's (userspace-based) needs. I've
attached my version below (and see ft_setup() at the bottom of the
file). Does it meet your requirements for the kernel bootwrapper?

One limitation of the attached code is that it doesn't support changing
the *size* of properties, though I don't think that would be too
difficult to add if needed.

Haren, what about using this in kexec-tools?

If everybody can use this (I expect small modifications would be
needed), I think we should turn it into a library in the dtc source
tree. The various projects using it could then include snapshots (to
avoid dependencies). In general I'd like to avoid everybody writing and
maintaining their own version of this stuff (myself included).

Hollis Blanchard
IBM Linux Technology Center

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