[Arm-dev] Different issues with "DTOVERLAY".

Stephan Guilloux stephan.guilloux at crisalid.com
Thu Sep 20 13:31:16 UTC 2018



Le 20/09/2018 à 13:02, Pablo Sebastián Greco a écrit :
>
> Stephan, sorry for the delay
>
No problemo.
Clearly, it's not an emergency.
Thx for your reply.

> El 10/9/18 a las 12:28, Stephan Guilloux escribió:
>> Hello,
>>
>> Small issues, today, with dtoverlay gpio-shutdown/poweroff
>>
>>     [root at mypi ~]# dtoverlay gpio-shutdown
>>     su: user pi does not exist
>>     * Failed to apply overlay '1_gpio-shutdown' (kernel)
>>     su: user pi does not exist
>>     [root at mypi ~]# dtoverlay gpio-poweroff
>>     su: user pi does not exist
>>     su: user pi does not exist
>>     [root at mypi ~]#
> That seems to come from here 
> (https://github.com/raspberrypi/userland/blob/master/host_applications/linux/apps/dtoverlay/dtoverlay-pre). 
> If you run as root, it tries to run as the user "pi", as a normal 
> user(any), you shouldn't have that problem
well ... not so sure :-)

     [stephan at myrpi ~]$ dtoverlay gpio-poweroff
     * Must be run as root - try 'sudo dtoverlay ...'
     [stephan at myrpi ~]$ sudo dtoverlay gpio-poweroff
     [sudo] password for stephan:
     su: user pi does not exist
     su: user pi does not exist
     [stephan at myrpi ~]$ dtoverlay -l
     Overlays (in load order):
     0:  gpio-poweroff
[stephan at myrpi ~]$

Then, I don't understand why it needs to be run with SUDO from any user 
to gain ROOT access ?

     [root at myrpi ~]# dtoverlay gpio-shutdown
     su: user pi does not exist
     su: user pi does not exist
     [root at CrisalidBox-C9A58C ~]# dtoverlay -l
     Overlays (in load order):
     0:  gpio-poweroff
     1:  gpio-shutdown
     [root at myrpi ~]#

Just funny :-)



>>
>> Even if I add a fake user "PI", this does not work better.
>>
>>     [root at mypi ~]# useradd -r pi -p pi
>>     [root at mypi ~]#
>>     [root at mypi ~]#
>>     [root at mypi ~]# dtoverlay gpio-poweroff
>>     * Failed to apply overlay '2_gpio-poweroff' (kernel)
>>     [root at mypi ~]# dtoverlay gpio-shutdown
>>     * Failed to apply overlay '2_gpio-shutdown' (kernel)
>>     [root at mypi ~]#
> That bit seems to come from here 
> (https://github.com/raspberrypi/userland/blob/2448644657e5fbfd82299416d218396ee1115ece/host_applications/linux/apps/dtoverlay/dtoverlay_main.c#L982), 
> it fails to check if the overlay was actually applied
>>
>> But when I check the overlay list, I get:
>>
>>     [root at mypi ~]# dtoverlay -l
>>     Overlays (in load order):
>>     0:  gpio-shutdown
>>     1:  gpio-poweroff
>>     [root at mypi ~]#
>>
>> At least, something is done :-)
>>
> That is a little stranger, why does it say it did something when the 
> command before said it failed???
>> Last problems:
>>     [root at mypi ~]# dtoverlay -h gpio-shutdown
>>     * Help file not found
>>     [root at mypi ~]# dtoverlay -h gpio-poweroff
>>     * Help file not found
>>     [root at mypi ~]# dtoverlay -h rpi-rtc
>>     * Help file not found
>>     [root at mypi ~]# dtoverlay -h rpi-display
>>     * Help file not found
>>     [root at mypi ~]#
>>
>>
>>
> I guess I'll have to add some debugging info and check in my rpi (as 
> time permits)

>> In case ...
>>     [root at mypi ~]# cat /proc/version
>>     Linux version 4.14.65-v7.1.el7 
>> (mockbuild at armhfp-03.bsys.centos.org) (gcc version 4.8.5 20150623 
>> (Red Hat 4.8.5-28) (GCC)) #1 SMP Mon Aug 20 19:04:20 UTC 2018
>>     [root at mypi ~]#
>>
>>     [root at mypi ~]# rpm -qa 'raspberrypi-vc*'
>> raspberrypi-vc-demo-source-20170705-502.gitaa39775.el7.noarch
>>     raspberrypi-vc-libs-20170705-502.gitaa39775.el7.armv7hl
>>     raspberrypi-vc-utils-20170705-502.gitaa39775.el7.armv7hl
>>     [root at mypi ~]#
>>
> 2 questions
> 1) has it ever worked before?
Well... never tried before.
I was just comparing the result between CentOS and R at spbi@n...

> 2) which rpi exactly are you using? (don't know if it is really relevant).
Standard RPI 3b.

>
> Thanks.
> Pablo.
>>
>> Stephan.
>>
> P.S.: Today we built 4.14.71 and will be released as soon as it passes 
> the tests.
Great !
What's new for RPI, I mean compared to 68, 69 and 70 ?


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