Re: [PATCH] powerpc: Export flat device tree via debugfs for debugging

[Michael Ellerman <michael@ellerman.id.au>]

[-- Attachment #1: Type: text/plain, Size: 1635 bytes --]

On Mon, 2006-05-01 at 12:54 -0500, Kumar Gala wrote:
> On May 1, 2006, at 2:40 AM, Michael Ellerman wrote:
> 
> > If DEBUG is turned on in prom.c, export the flat device tree via  
> > 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
> > ===================================================================
> > --- 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
> 
> 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

-- 
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

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 191 bytes --]