Re: exynos4412: misc issues on Hardkernel Odroid boards

[Tobias Jakobi <tjakobi@math.uni-bielefeld.de>]

Hello Marek,

Marek Szyprowski wrote:
> Hello Tobias,
> 
> On 2015-03-03 15:10, Marek Szyprowski wrote:
>> Hello,
>>
>> On 2015-02-24 14:39, Tobias Jakobi wrote:
>>> Hello Marek,
>>>
>>> sorry for the late response!
>>>
>>>
>>> On 2015-02-10 12:38, Marek Szyprowski wrote:
>>>> Hello,
>>>>
>>>> On 2015-02-09 21:28, Tobias Jakobi wrote:
>>>>> Hello!
>>>>>
>>>>> Marek Szyprowski wrote:
>>>>>> I didn't observe any issues with 'ondemand' governor. I've just
>>>>>> tested it
>>>>>> on next-20150204 with "[PATCH v2 0/3] Add support for hardware
>>>>>> reset of
>>>>>> eMMC
>>>>>> card on reboot" patches added
>>>>>> (http://www.spinics.net/lists/linux-mmc/msg30621.html) and reboot
>>>>>> works
>>>>>> fine.
>>>>> Since I'm not using an eMMC card, I don't think the pwrseq stuff is
>>>>> going to make a difference here.
>>>>> Have you checked this with the PS_HOLD patch applied, or without?
>>>>> Anyway, guess I'm going to recheck this, maybe with some other
>>>>> governors
>>>>> too.
>>>>
>>>> PS_HOLD patch is related to shutdown behavior. Reboot doesn't use
>>>> it. Could you
>>>> point which exactly version did you use and provide the .config
>>>> which causes
>>>> problems with normal reboot when system runs from SD card? For eMMC
>>>> you would
>>>> need patches from last linux-next.
>>>
>>> I'm currently using this tree:
>>> https://github.com/tobiasjakobi/linux-odroid
>>>
>>> In this is the config:
>>> https://raw.githubusercontent.com/tobiasjakobi/odroid-environment/master/sourcecode/system/vanilla-3.19-debug.conf
>>>
>>>
>>> Upon issuing reboot I get this here on the UART:
>>> chidori ~ # reboot
>>>
>>> Broadcast message from root@chidori (ttySAC1) (Mon Feb 23 17:04:44
>>> 2015):
>>>
>>> The system is going down for reboot NOW!
>>> INIT: Switching to runlevel: 6
>>> INIT: Sending processes the TERM signal
>>> chidori ~ #  * Stopping
>>> local                                             [ ok ]
>>>  * Stopping vixie-cron
>>> ...                                                [ ok ]
>>>  * Saving random seed
>>> ...                                                 [ ok ]
>>>  * Deactivating additional swap space
>>> ...                                 [ ok ]
>>>  * Stopping sshd
>>> ...                                                      [ ok ]
>>>  * Unmounting network filesystems
>>> ...                                     [ ok ]
>>>  * Stopping chronyd
>>> ...                                                   [ ok ]
>>>  * Stopping BlueTooth NAP
>>> ...                                             [ ok ]
>>>  * Stopping dnsmasq
>>> ...                                                   [ ok ]
>>>  * Stopping syslog-ng
>>> ...                                                 [ ok ]
>>>  * Shutting down bluetooth
>>> ...                                            [ ok ]
>>>  * Stopping D-BUS system messagebus
>>> ...                                   [ ok ]
>>>  * Unmounting loop devices
>>>  * Unmounting filesystems
>>>  *   Unmounting /usr/local/emu
>>> ...                                        [ ok ]
>>>  *   Unmounting /home
>>> ...                                                 [ ok ]
>>>  *   Unmounting /var
>>> ...                                                  [ ok ]
>>>  * Deactivating swap devices
>>> ...                                          [ ok ]
>>>  * Stopping udev
>>> ...                                                      [ ok ]
>>>  * Saving the shutdown time
>>> ...                                           [ ok ]
>>>  * Terminating remaining processes
>>> ...                                    [ ok ]
>>>  * Killing remaining processes
>>> ...                                        [ ok ]
>>>  * Saving dependency cache
>>> ...                                            [ ok ]
>>>  * Remounting remaining filesystems read-only ...
>>>  *   Remounting / read only ...
>>> [  113.526626] EXT4-fs (mmcblk0p2): re-mounted. Opts:
>>> (null)              [ ok ]
>>> [  115.609592] sd 0:0:0:0: [sda] Synchronizing SCSI cache
>>> [
>>>
>>>
>>> Notice the open bracket in the last line. Seems like there is still
>>> output in the kernel buffer, but the UART is maybe switched off
>>> before one can see that. At least there is nothing after that, and I
>>> have to manually restart the board then.
>>
>> I've just checked and it works fine with my Odroid U3+ board booted
>> from SD card. I have really no idea what wrong here... Could you check
>> if the same problem exist with vanilla v4.0-rc1 kernel?
> 
> I believe that patch e91d863d1aaeda0349aed42dfbd75c98e042a2c9 ("serial:
> samsung:
> Clear operation mode on UART shutdown") solves this issue. It has been
> merged to
> v4.0-rc7. Could you confirm it?
I've tried some reboot cycles without modifying the cpu governor and so
far all reboot worked. So this issue looks like its fixed.


With best wishes,
Tobias


> 
> Best regards