Matt Hart [off-list ref] writes:

On 6 October 2017 at 23:14, Florian Fainelli [off-list ref] wrote:

quoted

On 10/06/2017 03:05 PM, Eric Anholt wrote:

quoted

Hi Florian.  Here's a patch that's gone through a couple of revisions
on the list, that seriously fixes up the default serial behavior --
previously, without the right config.txt/cmdline bits, you'd often end
up with a hang with no output before booting completed.  It would be
great to get it into 4.14.

The following changes since commit 2bd6bf03f4c1c59381d62c61d03f6cc3fe71f66e:

  Linux 4.14-rc1 (2017-09-16 15:47:51 -0700)

are available in the git repository at:

  git://github.com/anholt/linux tags/bcm2835-dt-fixes-2017-10-06

for you to fetch changes up to f08f58a2bf68900a84e782b8c7ad701c0654173c:

  ARM: dts: bcm283x: Fix console path on RPi3 (2017-10-06 13:04:56 -0700)

----------------------------------------------------------------
This pull request brings in a fix for default serial console setup on
RPi3, so it now comes up with no config.txt/cmdline.txt settings in
the firmware.

----------------------------------------------------------------

Merged, thanks Eric

--
Florian

Hi all,

I realise this patch has been in mainline for a more than a week, but
I've only recently had time to bisect broken rpi-3 boots in kernelci
and found f08f58a2bf68900a84e782b8c7ad701c0654173c as the cause.

Kernelci boots the rpi3 using uboot, with console=ttyS0 in the command
line which now fails:
https://kernelci.org/boot/id/59f787f059b5147794ef1dcf/

Is there an alias I can use for both before and after this patch?

Mainline boots fine if I use console=ttyS1 or drop the console arg
altogether, but as we don't currently support different boot args per
tree, and we don't have the manpower to track this patch in all the
trees we test, we will have to switch to only boot testing mainline
from now on.

It seems to me the patch is doing the right thing, so this is just an
FYI, though I can imagine a few users getting caught by this.

Yeah, this matches my experience basically.  As far as I can tell, we
were just doing things wrong before, thus needing these custom boot args
that we can all now get rid of.  I wish I had a better answer.
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