From mboxrd@z Thu Jan  1 00:00:00 1970
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Subject: Re: [PATCH] powerpc: Export flat device tree via debugfs for debugging
From: Michael Ellerman <michael@ellerman.id.au>
To: Kumar Gala <galak@kernel.crashing.org>
In-Reply-To: <7C163A77-FF5F-49E7-87CF-0EA0411FE7A6@kernel.crashing.org>
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	<7C163A77-FF5F-49E7-87CF-0EA0411FE7A6@kernel.crashing.org>
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Date: Tue, 02 May 2006 10:20:00 +1000
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On Mon, 2006-05-01 at 12:54 -0500, Kumar Gala wrote:
> On May 1, 2006, at 2:40 AM, Michael Ellerman wrote:
>=20
> > If DEBUG is turned on in prom.c, export the flat device tree via =20
> > debugfs.
> > This has been handy on several occasions.
> >
> > To look at it:
> >  # mount -t debugfs none /sys/kernel/debug
> >  # od -a /sys/kernel/debug/powerpc/flat-device-tree
> >  and/or
> >  # dtc -fI dtb /sys/kernel/debug/powerpc/flat-device-tree -O dts
> >
> > Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
> > ---
> >
> >  arch/powerpc/kernel/prom.c |   25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> >
> > Index: to-merge/arch/powerpc/kernel/prom.c
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > --- to-merge.orig/arch/powerpc/kernel/prom.c
> > +++ to-merge/arch/powerpc/kernel/prom.c
> > @@ -30,6 +30,7 @@
> >  #include <linux/bitops.h>
> >  #include <linux/module.h>
> >  #include <linux/kexec.h>
> > +#include <linux/debugfs.h>
> >
> >  #include <asm/prom.h>
> >  #include <asm/rtas.h>
> > @@ -2009,3 +2010,27 @@ void kdump_move_device_tree(void)
> >  	/* XXX should we unreserve the old DT? */
> >  }
> >  #endif /* CONFIG_KEXEC */
> > +
> > +#ifdef DEBUG
>=20
> Shouldn't this also depend on DEBUGFS being built in.

It could, but DEBUG_FS is written so that you don't have to care, so I
didn't :)

cheers

--=20
Michael Ellerman
IBM OzLabs

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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