[yocto] meta-cedartrail - serial console

[Bodke, Kishore K]

>-----Original Message-----
>From: Hart, Darren
>Sent: Friday, June 01, 2012 2:17 PM
>To: Bodke, Kishore K
>Cc: jfabernathy; yocto at yoctoproject.org
>Subject: Re: [yocto] meta-cedartrail - serial console
>
>On 06/01/2012 02:02 PM, Bodke, Kishore K wrote:
>>
>>
>>> -----Original Message-----
>>> From: Hart, Darren
>>> Sent: Friday, June 01, 2012 11:12 AM
>>> To: Bodke, Kishore K
>>> Cc: jfabernathy; yocto at yoctoproject.org
>>> Subject: Re: [yocto] meta-cedartrail - serial console
>>>
>>> On 06/01/2012 11:03 AM, Bodke, Kishore K wrote:
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Hart, Darren
>>>>> Sent: Thursday, May 31, 2012 12:43 PM
>>>>> To: jfabernathy
>>>>> Cc: Bodke, Kishore K; yocto at yoctoproject.org
>>>>> Subject: Re: [yocto] meta-cedartrail - serial console
>>>>>
>>>>> On 05/31/2012 12:32 PM, jfabernathy wrote:
>>>>>> On 05/31/2012 02:18 PM, Bodke, Kishore K wrote:
>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: yocto-bounces at yoctoproject.org [mailto:yocto-
>>>>>>>> bounces at yoctoproject.org] On Behalf Of jfabernathy
>>>>>>>> Sent: Thursday, May 31, 2012 9:12 AM
>>>>>>>> To: yocto at yoctoproject.org
>>>>>>>> Subject: [yocto] meta-cedartrail - serial console
>>>>>>>>
>>>>>>>> Using a DN2800MT (Marshalltown) Intel board, I'm testing the
>>>>>>>> meta-cedartrail using edison branch and noticed an issues with the
>>>>>>>> serial console.
>>>>>>>>
>>>>>>>> The cedartrail.conf in the machine directory has the following
>>> statements:
>>>>>>>>
>>>>>>>> SYSLINUX_OPTS = "serial 0 115200"
>>>>>>>> SERIAL_CONSOLE = "115200 ttyS0"
>>>>>>>> APPEND += "console=ttyS0,115200 console=tty0"
>>>>>>>>
>>>>>>> I just saw that Edison branch has ttyS3 enabled.
>>>>>>>
>>>>>>> SYSLINUX_OPTS = "serial 3 115200"
>>>>>>> SERIAL_CONSOLE = "115200 ttyS3"
>>>>>>> APPEND += "console=ttyS3,115200 console=tty3"
>>>>>>>
>>>>>>> Are you looking into right branch?
>>>>>>>
>>>>>>> Thanks
>>>>>>> -Kishore.
>>>>>>>
>>>>>>
>>>>>> So how do you get changes in the cedartrail.conf file to take affect??
>>>>>> I edited the file and did the bitbake again, but nothing changed.  I'm
>>>>>> guessing I need a bitbake -c cleansstate "somthing"  But I don't know
>>>>>> what to put there to make rebuild with ttyS0.
>>>>>>
>>>>>
>>>>> Ah yes, this rebuild is a bit frustrating. I believe it is the
>>>>> task_core* tasks you need to rebuild. bitbake -u depexp -g
>>>>> core-image-base (whatever your image is) will allow you to view which
>>>>> task_ tasks it is building, try cleansstate'ing those and rebuilding the
>>>>> image.
>>>>
>>>> I had to remove the above 3 lines from cedartrail.conf and
>>>> SERIAL_CONSOLE ?= "115200 ttyS0" line from conf/machine/include/ia32-
>>> base.inc
>>>> rebuild the image.
>>>> It is disabled now.
>>>
>>> Did you try with SERIAL_CONSOLE="" in cedartrail.conf ?
>>
>> Yes. I tried this.  It is disabled.
>>
>
>Meaning you do not have to modify ia32-base.inc?

I removed the  SERIAL_CONSOLE ?= "115200 ttyS0" from ia32-base.inc too.

>
>> I again added back in the grub.cfg, serial console hangs.
>
>Added what back in grub.cfg?

I added back console=ttyS0,115200 console=tty0 to the grub.cfg file and rebooted 
to see if I can get the serial console back, but after below boot messages the serial
console hangs.

Freeing unused kernel memory: 496k freed
udev[77]: starting version 164
EXT3-fs: barriers not enabled
kjournald starting.  Commit interval 5 seconds
EXT3-fs (loop0): using internal journal
EXT3-fs (loop0): recovery complete
EXT3-fs (loop0): mounted filesystem with ordered data mode
udev[487]: starting version 164
NET: Registered protocol family 10
ADDRCONF(NETDEV_UP): eth0: link is not ready
ip_tables: (C) 2000-2006 Netfilter Core Team
nf_conntrack version 0.5.0 (16384 buckets, 65536 max)

>
>I thought you were disabling the serial port...

I wanted to enable and disable the serial console through grub.cfg file.

Thanks
Kishore.

>
>Where does the serial console hang? In grub? During boot? At the login
>prompt?
>
>
>
>--
>Darren Hart
>Intel Open Source Technology Center
>Yocto Project - Linux Kernel