From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Subject: Re: Odroid U2 Kernel 4.7rc7+ Hang on reboot
Date: Fri, 15 Jul 2016 16:33:45 +0200
Message-ID: <5788F449.6060202@math.uni-bielefeld.de>
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To: Krzysztof Kozlowski <k.kozlowski@samsung.com>, nicolas@ndufresne.ca, "linux-samsung-soc@vger.kernel.org" <linux-samsung-soc@vger.kernel.org>
Cc: Javier Martinez Canillas <javier@osg.samsung.com>

Krzysztof Kozlowski wrote:
> On 07/15/2016 03:23 PM, Tobias Jakobi wrote:
>> Krzysztof Kozlowski wrote:
>>> On 07/15/2016 03:15 PM, Tobias Jakobi wrote:
>>>> Hey,
>>>>
>>>> Krzysztof Kozlowski wrote:
>>>>> On 07/15/2016 09:55 AM, Krzysztof Kozlowski wrote:
>>>>>>>> Nicolas Dufresne wrote:
>>>>>>>>> Le jeudi 14 juillet 2016 =C3=A0 15:37 -0400, Nicolas Dufresne=
 a =C3=A9crit :
>>>>>>>>>> Hi,
>>>>>>>>>>
>>>>>>>>>> I'm using the Odroid U2 to test some features implemented in
>>>>>>>>>> GStreamer.
>>>>>>>>>> The parts I need mostly works in mainline kernel, my main
>>>>>>>>>> annoyance
>>>>>>>>>> ist
>>>>>>>>>> that reboot hangs.
>>>>>>>>>>
>>>>>>>>>> Is this issue known ? I'm booting from SD card is that matte=
rs.
>>>>>>>>>> Any
>>>>>>>>>> advise would be appreciated. I'm not list member, so please =
keep
>>>>>>>>>> me
>>>>>>>>>> in
>>>>>>>>>> CC. I'm sharing my .config, in case that is my fault.
>>>>>>
>>>>>> First of all - use just command "reboot" to restart. It should w=
ork. If
>>>>>> it doesn't, please let us now.
>>>>>>
>>>>>> I was able to reproduce your issue - OOPS in emergency restart -=
 also in
>>>>>> my configuration (U3 + eMMC + network boot).
>>>>>>
>>>>>> It is weird... I'll take a look at it.
>>>>>
>>>>> Actually I did not encounter OOPS of yours. I was able to reprodu=
ce a
>>>>> failure to reboot on U3. XU3 reboots fine. It might be related to=
 pwrseq...
>>>> I'm not sure how much that helps, but I can't reproduce any of thi=
s on
>>>> my X2 (which is quite closely related to the U2/U3).
>>>
>>> You mean sysrq reboot works fine?
>> No, I haven't checked that yet. But normal reboot and poweroff via i=
nit
>> works properly.
>=20
> Yeah, these work fine. It is all about emergency restart.
I can confirm that this indeed doesn't work.

chidori ~ # echo 1 > /proc/sys/kernel/sysrq
chidori ~ # echo s > /proc/sysrq-trigger
chidori ~ # echo u > /proc/sysrq-trigger
chidori ~ # echo b > /proc/sysrq-trigger
<board hangs, only red power LED on>

I guess Nicolas is seeing a different or another problem here though.

With best wishes,
Tobias


> Best regards,
> Krzysztof
>=20
>=20
>=20