From: David Gibson <david@gibson.dropbear.id.au>
To: Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
Cc: linuxppc-dev@ozlabs.org, linuxppc-embedded@ozlabs.org, "Morrison,
Tom" <tmorrison@empirix.com>
Subject: Re: device tree / how to build/compile & use with u-boot to boot uImage?
Date: Sat, 10 Feb 2007 09:41:42 +1100 [thread overview]
Message-ID: <20070209224142.GC7339@localhost.localdomain> (raw)
In-Reply-To: <45CCF4EF.9050507@smiths-aerospace.com>
On Fri, Feb 09, 2007 at 05:25:51PM -0500, Jerry Van Baren wrote:
> Morrison, Tom wrote:
> > All,
> >
> > Sorry for my ignorance here, but we have upgraded our kernel from
> > 2.6.11.xx to 2.6.20-rcx (using a specific git-branch for the mpc85xx)
> > to run on the MPC8548CDS eval board (using default options provided
> > by this branch for this eval board). I successfully compiled/loaded the
> > uImage, but it hangs after decompression (with root=/dev/nfs)
> >
> > Also, I was told to upgrade our u-boot source code (with another git
> > branch for to the mpc85xx) and successfully get to the u-boot prompt.
> >
> > From googling through the lists - it seems that I need to build a
> > device tree blob and pass that device tree to the kernel in some
> > fashion?
> >
> > I tried to compile the default dts image (using the dtc compiler
> > installed by LTIB), but it is complaining about no '/chosen' in
> > the definition:
> >
> > <path>/dtc -I dts -O dtb - -o mpc8548cds.dtb -V 16 dts/mpc8548cds.dts
>
> Trivia: the no "/chosen" warning can be ignored. The u-boot command
> "bootm" generates the "/chosen" branch when you run the command and it
> boots linux.
>
> Note: You want version 16 (or better?) for the fdt blob. I believe the
> dtc defaults to this now, but it wasn't always that way.
Actually you want version 17 - just as soon as I get around to
implementing that in dtc. v16 and v17 have no differences that the
kernel looks at though, so it doesn't really matter.
--
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_!
http://www.ozlabs.org/~dgibson
next prev parent reply other threads:[~2007-02-09 22:41 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-09 21:55 device tree / how to build/compile & use with u-boot to boot uImage? Morrison, Tom
2007-02-09 22:19 ` Ben Warren
2007-02-09 22:25 ` Jerry Van Baren
2007-02-09 22:41 ` David Gibson [this message]
2007-02-09 22:37 ` Grant Likely
2007-02-10 0:42 ` David Gibson
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