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Date:      Mon, 22 Jul 2019 10:26:52 +0200
From:      Emmanuel Vadot <manu@bidouilliste.com>
To:        John-Mark Gurney <jmg@funkthat.com>
Cc:        Ian Lepore <ian@freebsd.org>, arm@FreeBSD.org
Subject:   Re: 13-CURRENT snapshot 20190718 r350103 doesn't boot on BeagleBone White
Message-ID:  <20190722102652.abde19a9fb609451cb618fde@bidouilliste.com>
In-Reply-To: <20190721205557.GR2342@funkthat.com>
References:  <20190721180510.GQ2342@funkthat.com> <415c9b4760029235cd62bf95a35a736f7566cb9d.camel@freebsd.org> <20190721205557.GR2342@funkthat.com>

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On Sun, 21 Jul 2019 13:55:57 -0700
John-Mark Gurney <jmg@funkthat.com> wrote:

> Ian Lepore wrote this message on Sun, Jul 21, 2019 at 12:31 -0600:
> > On Sun, 2019-07-21 at 11:05 -0700, John-Mark Gurney wrote:
> > > The microSD card that I was using on my BeagleBone white got
> > > corrupted,
> > > so I decided to update to the latest version.  The latest snapshot
> > > fails
> > > to boot.  It loads the kernel, but then when starting the kernel, it
> > > hangs, and eventually it will reset.
> > > 
> > > The latest 12 snapshot boots fine: BEAGLEBONE-20190718-r350087.
> > > 
> > > Any ideas?  I tried all three available 13 snaps, and they all behave
> > > the same.
> > > 
> > 
> > This happened with the latest DTS import (which was months ago).  A
> > couple people have speculated that we just need a trivial do-nothing
> > driver for the new ti,sysc device, but when I tried that a couple
> > months ago it didn't work, so instead I just reverted sys/dts to the
> > old source and got on with what I needed to do.
> 
> Can we revert the dts in the tree then?  Doesn't help when we know
> the fix, but don't apply it...

 That would be a pain for the next updates.

> Or add an overlay that undoes the changes?
> 
> I can do some testing...

 Could be possible but that will probably break in a few updates of the
DTS files.

 We need a TI maintainer that's all.

> > This is just the latest in a years-long string of breakages because the
> > linux TI folks just never stop tinkering with their device-tree source.
> > I'm sure they're doing it because it gets them some benefits, but for
> > us the changes add no value and have a high maintenance cost.  A hang
> > before the copyright banner appears is especially painful to debug
> > (doubly so because there's no existing EARLY_PRINTF support in the ti
> > code).
> 
> [...]
> 
> -- 
>   John-Mark Gurney				Voice: +1 415 225 5579
> 
>      "All that I will do, has been done, All that I have, has not."
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-- 
Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>



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