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From: "Grant Likely" <grant.likely@secretlab.ca>
To: "Segher Boessenkool" <segher@kernel.crashing.org>,
	"Paul Mackerras" <paulus@samba.org>,
	linuxppc-dev@ozlabs.org, "Rob Landley" <rob@landley.net>,
	"Milton Miller" <miltonm@bga.com>,
	"Christoph Hellwig" <hch@lst.de>
Subject: Re: [PATCH 1/2] qemu platform, v2
Date: Wed, 17 Oct 2007 14:28:41 -0600	[thread overview]
Message-ID: <fa686aa40710171328y195aca9k6ee8a1a5502fcf57@mail.gmail.com> (raw)
In-Reply-To: <20071001053326.GA15132@localhost.localdomain>

On 9/30/07, David Gibson <david@gibson.dropbear.id.au> wrote:
> On Fri, Sep 28, 2007 at 06:53:28PM +0200, Segher Boessenkool wrote:
> > >> I'd be following this more closely if compiling a device tree didn't
> > >> currently
> > >> require an external utility (dtc or some such) that doesn't come with
> > >> the
> > >> Linux kernel.  No other target platform I've built kernels for
> > >> requires such
> > >> an environmental dependency.
> > >
> > > No?  You haven't built kernels for other platforms that have external
> > > dependencies such as perl, gcc, make, binutils, etc.? :)
> >
> > Two of the supported Linux archs cannot be built with a mainline
> > compiler, even!
> >
> > And I have to install GNU sed/awk to get builds to work, too.
> >
> > OTOH, it would be nice if we didn't need DTC -- it itself doesn't
> > build out-of-the-box on all systems, either ;-)
> >
> > >>  (This is a problem both for hardwiring the
> > >> device tree into the kernel and for building a new boot rom from the
> > >> linux
> > >> kernel's ppc boot wrapper that would contain such a device tree to
> > >> feed to
> > >> the kernel.)
> > >
> > > It's only really been a problem for ps3 so far, since the embedded
> > > guys don't seem to have any difficulty with installing dtc.  We are
> > > looking at what to do for ps3 and prep, and the answer may well
> > > involve bundling dtc in the kernel source (it's not too big, around
> > > 3400 lines).
> >
> > If only a few platforms have this problem, we could instead include
> > their .dtb files in the kernel source tree.
>
> Including .dtbs in the kernel tree has a big practical problem:
> they're binary, so can't be patch(1)ed, which makes updating them a
> complete PITA.
>
> I'm working on merging dtc into the kernel tree instead.

I'm kind of late to this party; but I have to say I disagree.  Most of
us are doing just fine installing the dtc tool (and mkimage tool for
that matter).  Cloning it in the kernel tree is just asking for
divergence.

Cheers,
g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely@secretlab.ca
(403) 399-0195

  reply	other threads:[~2007-10-17 20:28 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-21 23:02 [PATCH 0/15] bootwrapper: kexec and external payloads Milton Miller
2007-09-21 23:03 ` [PATCH 1/15] boot: find initrd location from device-tree Milton Miller
2007-09-24  2:58   ` David Gibson
2007-09-24  5:50     ` Rob Landley
2007-09-24  8:02     ` Milton Miller
2007-09-25  3:27       ` David Gibson
2007-09-26  5:49         ` Milton Miller
2007-09-21 23:03 ` [PATCH 2/15] boot: record header bytes in gunzip_start Milton Miller
2007-09-24  2:59   ` David Gibson
2007-09-21 23:03 ` [PATCH 3/15] boot: simplfy gunzip_finish Milton Miller
2007-09-21 23:03 ` [PATCH 4/15] bootwrapper: smp support code Milton Miller
2007-09-21 23:04 ` [PATCH 5/15] bootwrapper: occuppied memory ranges Milton Miller
2007-09-24  3:09   ` David Gibson
2007-09-24  9:33     ` Milton Miller
2007-09-21 23:04 ` [PATCH 6/15] bootwrapper: help for 64 bit cpus Milton Miller
2007-09-24  3:14   ` David Gibson
2007-09-21 23:04 ` [PATCH 7/15] bootwrapper: Add kexec callable zImage wrapper Milton Miller
2007-09-24  3:23   ` David Gibson
2007-09-21 23:05 ` [PATCH 8/15] bootwrapper: convert flatdevtree to version 16 Milton Miller
2007-09-24  3:36   ` David Gibson
2007-09-24  6:54     ` Milton Miller
2007-09-25  3:46       ` David Gibson
2007-09-26 16:19         ` Milton Miller
2007-09-27  2:45           ` David Gibson
2007-09-27 15:44             ` Milton Miller
2007-09-28  2:40               ` David Gibson
2007-09-28 15:16                 ` Milton Miller
2007-10-03  5:29                   ` David Gibson
2007-09-21 23:05 ` [PATCH 9/15] bootwrapper: rtas support Milton Miller
2007-09-24  3:46   ` David Gibson
2007-09-21 23:05 ` [PATCH 10/15] bootwrapper: add cpio file extraction library Milton Miller
2007-09-21 23:06 ` [PATCH 11/15] bootwrapper: allow vmlinuz to be an external payload Milton Miller
2007-09-21 23:06 ` [PATCH 12/15] bootwrapper: kexec extract vmlinux from initramfs Milton Miller
2007-09-21 23:06 ` [PATCH 13/15] bootwrapper: attach an empty vmlinux Milton Miller
2007-09-24  4:03   ` David Gibson
2007-09-21 23:08 ` [PATCH 14/15] boot: add a hook to start cpus Milton Miller
2007-09-21 23:08 ` [PATCH 15/15] bootwrapper: recheck for command line after fixups Milton Miller
2007-09-21 23:08 ` [PATCH 1/2] qemu platform, v2 Milton Miller
2007-09-22  9:55   ` Christoph Hellwig
2007-09-22 19:16     ` Rob Landley
2007-09-23  4:27       ` Paul Mackerras
2007-09-23 22:01         ` Rob Landley
2007-09-28 16:53         ` Segher Boessenkool
2007-09-28 20:14           ` Rob Landley
2007-10-01  5:33           ` David Gibson
2007-10-17 20:28             ` Grant Likely [this message]
2007-10-17 23:09               ` Rob Landley
2007-10-18  9:59               ` Matt Sealey
2007-10-18 17:19                 ` Milton Miller
2007-10-18 17:29                   ` Grant Likely
2007-10-19  6:28                     ` Rob Landley
2007-09-24  4:00     ` David Gibson
2007-09-24  7:46       ` Christoph Hellwig
2007-09-24  9:48         ` Milton Miller
2007-09-21 23:08 ` [PATCH 2/2] qemu platform rom, v2 Milton Miller

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