* Printing device tree on running system
@ 2007-09-20 15:55 Jon Smirl
2007-09-20 16:08 ` Scott Wood
0 siblings, 1 reply; 4+ messages in thread
From: Jon Smirl @ 2007-09-20 15:55 UTC (permalink / raw)
To: linuxppc-embedded
Is there a command for printing the device tree on a running system? I
want to see what changes the various device drivers made to the DTC I
started with.
--
Jon Smirl
jonsmirl@gmail.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Printing device tree on running system
2007-09-20 15:55 Printing device tree on running system Jon Smirl
@ 2007-09-20 16:08 ` Scott Wood
2007-09-20 16:21 ` Jon Smirl
0 siblings, 1 reply; 4+ messages in thread
From: Scott Wood @ 2007-09-20 16:08 UTC (permalink / raw)
To: Jon Smirl; +Cc: linuxppc-embedded
On Thu, Sep 20, 2007 at 11:55:10AM -0400, Jon Smirl wrote:
> Is there a command for printing the device tree on a running system? I
> want to see what changes the various device drivers made to the DTC I
> started with.
It's exported in /proc/device-tree, if support is built into the kernel.
It might be interesting to make dtc support turning that into a dts...
-Scott
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Printing device tree on running system
2007-09-20 16:08 ` Scott Wood
@ 2007-09-20 16:21 ` Jon Smirl
2007-09-20 4:57 ` Josh Boyer
0 siblings, 1 reply; 4+ messages in thread
From: Jon Smirl @ 2007-09-20 16:21 UTC (permalink / raw)
To: Scott Wood; +Cc: linuxppc-embedded
On 9/20/07, Scott Wood <scottwood@freescale.com> wrote:
> On Thu, Sep 20, 2007 at 11:55:10AM -0400, Jon Smirl wrote:
> > Is there a command for printing the device tree on a running system? I
> > want to see what changes the various device drivers made to the DTC I
> > started with.
>
> It's exported in /proc/device-tree, if support is built into the kernel.
That worked, didn't know the option existed.
>
> It might be interesting to make dtc support turning that into a dts...
That would be useful, you could do a diff and see how the tree was altered.
The case I just looked at was old code manually building entries for
i2c devices in the tree, but with an updated dts the devices are
already in the tree which explains the error I got about conflicting
device nodes.
>
> -Scott
>
--
Jon Smirl
jonsmirl@gmail.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Printing device tree on running system
2007-09-20 16:21 ` Jon Smirl
@ 2007-09-20 4:57 ` Josh Boyer
0 siblings, 0 replies; 4+ messages in thread
From: Josh Boyer @ 2007-09-20 4:57 UTC (permalink / raw)
To: Jon Smirl; +Cc: linuxppc-embedded
On Thu, 2007-09-20 at 12:21 -0400, Jon Smirl wrote:
> On 9/20/07, Scott Wood <scottwood@freescale.com> wrote:
> > On Thu, Sep 20, 2007 at 11:55:10AM -0400, Jon Smirl wrote:
> > > Is there a command for printing the device tree on a running system? I
> > > want to see what changes the various device drivers made to the DTC I
> > > started with.
> >
> > It's exported in /proc/device-tree, if support is built into the kernel.
>
> That worked, didn't know the option existed.
>
> >
> > It might be interesting to make dtc support turning that into a dts...
dtc does support that. Pass /proc/device-tree/ to dtc like this:
dtc -I fs -o device-tree.dts -O dts /proc/device-tree
josh
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2007-09-21 1:18 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2007-09-20 15:55 Printing device tree on running system Jon Smirl
2007-09-20 16:08 ` Scott Wood
2007-09-20 16:21 ` Jon Smirl
2007-09-20 4:57 ` Josh Boyer
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