Subject: Re: Kernel 3.15: Boot problems with a PA6T board

From: Michael Ellerman <[email-masked]>
Date: Thu, 29 May 2014 12:48:31 +1000

On Wed, 2014-05-28 at 13:25 +0200, Christian Zigotzky wrote:
> On 28.05.2014 10:53, Christian Zigotzky wrote:
> > Hi Michael,
> >
> > Thank you for your answer and thank you for your help. :-)
> >
> > On 28.05.2014 06:23, Michael Ellerman wrote:
> >> On Wed, 2014-05-28 at 01:08 +0200, Christian Zigotzky wrote:
> >>
> >> I'm going to guess that cd427485357c0c4b99f69719251baacf25946e11 is 
> >> BAD. Can
> >> you please confirm or deny that?
>
> > It's not BAD. It boots.

Hmm, interesting.

> >> If cd42748 is *good*, then you'll need to do a bigger bisect from 
> >> d8ff9cd to
> >> 18a1a7a.

> OK :-)
> 
> -> git clone 
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux2-git
> -> git bisect start
> -> git bisect good d8ff9cdf68fd119d491f3de90e1a612afc2f3b2b
> -> git bisect bad 18a1a7a1d862ae0794a0179473d08a414dd49234
> 
> Output:
> Bisecting: 5900 revisions left to test after this (roughly 13 steps)
> [cb1595563880a81dab6eab9a5ecb4520d2e76077] Merge tag 'tty-3.15-rc1' of 
> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
> 
> Unfortunately it doesn't boot. :-(

OK. So you do:

$ git bisect bad

And it will pick a new commit for you to test. Repeat that ~13 times and you
should have identified the bad commit.

cheers