Re: purpose of /chosen node (was RE: [PATCH] powerpc: delete boot-cpu and chosen nodes from all DTSfiles)

On Feb 15, 2007, at 3:26 PM, Yoder Stuart-B08248 wrote:

quoted

-----Original Message-----
From: linuxppc-dev-bounces+b08248=freescale.com@ozlabs.org
[mailto:linuxppc-dev-bounces+b08248=freescale.com@ozlabs.org]
On Behalf Of Segher Boessenkool
Sent: Wednesday, February 14, 2007 7:40 PM
To: David Gibson
Cc: linuxppc-dev@ozlabs.org; Tabi Timur-B04825
Subject: Re: [PATCH] powerpc: delete boot-cpu and chosen
nodes from all DTSfiles

quoted

My point is that the interrupt-controller property in

/chosen *should*

quoted

be there, but it doesn't make a lot of sense for it to be set by the
bootloader (because it's a fixed property of the board).

And that means it shouldn't be in /chosen at all.  It's not
just a fixed property of the board, it is a physical property
of the board.  It doesn't belong in /chosen.

I agree with Segher here.  The interrupt-controller property doesn't
belong in /chosen.

The 1275 OF spec says about /chosen:

   Has properties describing parameters chosen or specified at
   runtime.

I want to reiterate something Paul mentioned, any similarity that the  
device tree has to 1275 is strictly coincidental.

- k