[meta-freescale] imx6q: Startup script output not shown on serial console

Thu Jul 9 06:54:20 PDT 2015

On Thu, Jul 9, 2015 at 6:37 PM, Gary Thomas <gary at mlbassoc.com> wrote:
> On 2015-07-09 06:51, Prasant J wrote:
>>
>> On Thu, Jul 9, 2015 at 4:52 PM, Gary Thomas <gary at mlbassoc.com> wrote:
>>>
>>> On 2015-07-09 04:37, Prasant J wrote:
>>>>
>>>>
>>>> On Mon, Jun 8, 2015 at 7:44 PM, Prasant J <pj0585 at gmail.com> wrote:
>>>>>
>>>>>
>>>>> On Mon, Jun 8, 2015 at 5:40 PM, Daiane Angolini <daiane.list at gmail.com>
>>>>> wrote:
>>>>>>
>>>>>>
>>>>>> On Mon, Jun 8, 2015 at 5:57 AM, Prasant J <pj0585 at gmail.com> wrote:
>>>>>>>
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> I have built the freescale linux image (for my custom board using
>>>>>>> iMX6Q) fsl_L.3.14.28-1.0.0_ga. While building I added few more
>>>>>>> packages like rpm, opkg, e2fsprogs, etc.
>>>>>>>
>>>>>>> The startup scripts do not show std output on the serial console
>>>>>>> (ttymxc0). The output is likely redirected to /dev/null. They only
>>>>>>> sow
>>>>>>> errors. Which setting (file) has to be modified to get the output on
>>>>>>> the serial console?
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> http://git.yoctoproject.org/cgit/cgit.cgi/meta-fsl-arm/tree/conf/machine/include/imx6sabresd-common.inc#n6
>>>>>>
>>>>>> Take a look in the difference between file imx6sabresd-common.inc and
>>>>>> imx6sabreauto-common.inc
>>>>>>
>>>>>> Maybe it can help you
>>>>>>
>>>>>
>>>>> Thanks Daiane for your inputs!
>>>>>
>>>>> The link you pasted indicates that correct serial port must be
>>>>> specified.
>>>>>
>>>>> I have ensured that correct serial port is set (/etc/inittab) . I can
>>>>> see the errors but I cannot see the stdout.
>>>>> I think there is a setting for verbosity, which is set to quiet. I'm
>>>>> not sure though.
>>>>>
>>>>> FYI: I also have installed procps package.
>>>>>
>>>>> I modified the file /etc/init.d/bootmisc.sh:
>>>>> original line:  eval /sbin/sysctl -p "${SYSCTL_CONF}" $VERBOSE_REDIR
>>>>> edited line:    eval /sbin/sysctl -p "${SYSCTL_CONF}"
>>>>> (VERBOSE_REDIR is set to "1>/dev/null")
>>>>>
>>>>> After the above modification, I can see script stdout while system
>>>>> reboot or shutdown, but I cannot see the same during system startup.
>>>>>
>>>>>
>>>>
>>>> I have built the yocto image again (fsl_L.3.14.28-1.0.0_ga)
>>>> (framebuffer)
>>>>
>>>>
>>>> I verified the file:
>>>>
>>>>
>>>> fsl-L3.14.28-1.0.0_ga/fsl-release-bsp/sources/meta-fsl-arm/conf/machine/include/imx6sabresd-common.inc
>>>> correct console device and baud rate is selected (ttymxc0).
>>>>
>>>>
>>>> I have installed extra packages by adding the following line to
>>>> conf/local.conf:
>>>> CORE_IMAGE_EXTRA_INSTALL += " rpm opkg freetype createrepo
>>>> libsocketcan ntp parted cairo curl python-pycurl expat harfbuzz htop
>>>> pixman tslib e2fsprogs fontconfig pango glib-2.0 opkg-utils sqlite3
>>>> python-pysqlite libcurl bzip2 dropbear python-smartpm tzdata
>>>> python-debugger python-difflib python-sqlite3 connman connman-client
>>>> e2fsprogs-tune2fs lsof msmtp iptables "
>>>>
>>>>
>>>> I do not see the init scripts log on the serial console (during
>>>> startup). There is no issue with console configuration as the init
>>>> scripts show log during shutdown/reboot.
>>>>
>>>>
>>>>
>>>> If I run "ps eax", I see the following (partial output shown here):
>>>>
>>>>    1424 ?        Ss     0:00 /lib/udev/udevd -d CONSOLE=/dev/null
>>>> display_lvds0= display_lvds1= SHELL=/bin/sh TERM=linux prevlevel=N
>>>> INIT_VERSION=sysvinit-2.88 PATH=/sbin:/bin:/usr/sbin:/usr/bin
>>>> ACTION=add runlevel=S RUNLEVEL=S PWD=/ VERBOSE=very TZ=/etc/localtime
>>>> PREVLEVEL=N previous=N SHLVL=2 HOME=/ _=/lib/udev/udevd
>>>>    1509 ?        S      0:00 /lib/udev/udevd -d CONSOLE=/dev/null
>>>> display_lvds0= display_lvds1= SHELL=/bin/sh TERM=linux prevlevel=N
>>>> INIT_VERSION=sysvinit-2.88 PATH=/sbin:/bin:/usr/sbin:/usr/bin
>>>> ACTION=add runlevel=S RUNLEVEL=S PWD=/ VERBOSE=very TZ=/etc/localtime
>>>> PREVLEVEL=N previous=N SHLVL=2 HOME=/ _=/lib/udev/udevd
>>>>    1510 ?        S      0:00 /lib/udev/udevd -d CONSOLE=/dev/null
>>>> display_lvds0= display_lvds1= SHELL=/bin/sh TERM=linux prevlevel=N
>>>> INIT_VERSION=sysvinit-2.88 PATH=/sbin:/bin:/usr/sbin:/usr/bin
>>>> ACTION=add runlevel=S RUNLEVEL=S PWD=/ VERBOSE=very TZ=/etc/localtime
>>>> PREVLEVEL=N previous=N SHLVL=2 HOME=/ _=/lib/udev/udevd
>>>>    1973 ?        Ss     0:00 /usr/bin/eGTouchD CONSOLE=/dev/null
>>>> display_lvds0= display_lvds1= TERM=linux SHELL=/bin/sh
>>>> INIT_VERSION=sysvinit-2.88
>>>> PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
>>>> RUNLEVEL=5 runlevel=5 PWD=/ VERBOSE=very PREVLEVEL=N previous=N HOME=/
>>>> SHLVL=2 _=/usr/bin/eGTouchD
>>>>    1983 ?        Ss     0:00 /usr/bin/dbus-daemon --system
>>>> CONSOLE=/dev/null display_lvds0= display_lvds1= TERM=linux
>>>> SHELL=/bin/sh INIT_VERSION=sysvinit-2.88
>>>> PATH=/sbin:/usr/sbin:/bin:/usr/bin RUNLEVEL=5 runlevel=5 PWD=/
>>>> VERBOSE=very PREVLEVEL=N previous=N HOME=/ SHLVL=2
>>>> _=/sbin/start-stop-daemon
>>>>    1989 ?        Ss     0:00 /usr/sbin/connmand CONSOLE=/dev/null
>>>> display_lvds0= display_lvds1= TERM=linux SHELL=/bin/sh
>>>> INIT_VERSION=sysvinit-2.88 PATH=/sbin:/usr/sbin:/bin:/usr/bin
>>>> RUNLEVEL=5 runlevel=5 PWD=/ VERBOSE=very PREVLEVEL=N previous=N HOME=/
>>>> SHLVL=2 _=/usr/sbin/connmand
>>>>
>>>>
>>>>
>>>> I edit the file: /etc/init.d/rc and exported CONSOLE=/dev/ttymxc0.
>>>> When I reboot the system and re-run "ps eax" I can see the CONSOLE env
>>>> getting correctly updated. But still no output on the serial log.
>>>>
>>>>
>>>> Any inputs what may be going wrong?
>>>>
>>>> I'm kind of stuck here. Any information might be of help to me.
>>>>
>>>>
>>>> Regards, Pj
>>>>
>>>
>>> What is your boot command line?
>>>    # cat /proc/cmdline
>>>
>>> It should be something that contains 'console=ttymxc0'
>>>
>>> --
>>
>>
>> Gary, console is set to "ttymxc0,57600' . I can see in the cat
>> /proc/cmdline.
>
>
> Are you really running the console at 57600 baud?  The default
> is normally 115200.  What's in your /etc/inittab?  e.g. send
> the output from this command:
>
>   # grep mxc0 /etc/inittab
>    mxc0:12345:respawn:/sbin/getty -L 115200 ttymxc0
>

Yes, I'm using baud rate of 57600.
/etc/inittab is also updated.

I think I may have found the problem. I'm not sure though.

udev is not creating /dev/stdout & /dev/stderr links.
It creates /dev/stdin link file.

I don't know how to fix this. I manually created the links but it does
not solve the problem.

Any ideas?

regards, Pj