[Dev] Tizen on Raspberry PI 2 using Yocto

Mauro Carvalho Chehab mchehab at osg.samsung.com
Tue Apr 21 10:24:41 GMT 2015

Em Tue, 21 Apr 2015 03:20:13 +0300
Leon Anavi <leon.anavi at konsulko.com> escreveu:

> Hi Mauro,
> Well done. Thank you for sharing this very useful tutorial!


> I have Raspberry Pi 2 and tonight I tried the tutorial before going to 
> bed. Following the described steps I managed to build an image but it 
> fails to boot due to a kernel panic. Please have a look at my logs: 
> https://gist.github.com/leon-anavi/386e81df83b0b5b1d62d
> I got the same result using two different microSD cards. I had a long 
> day so may be I am missing something simple. Have you experienced 
> something similar and could you please provide me hints how to solve it?

Here, everything is booting smoothly, but I didn't try to use a serial
console or to run it in kdbg mode. Perhaps it reached some race condition
at Kernel level. Yet, from this message:
	PANIC: Attempted to kill init! exitcode=0x00007f00

I suspect that systemd died for some unknown reason.

That's said, before adding the init to use systemd at cmdline.txt,
I noticed that, when exiting from init via shutdown, a Kernel panic
was happening.

So, I suspect that there's a bug at the Raspberry PI 2 Kernel that
causes a panic at shutdown, depending on the exit condition (as I
didn't notice such bug when systemd is running on my system).

> Btw some information that might be useful for other developers. The 
> procedure to enable serial debugging on Raspberry Pi 2 is the same as on 
> the old model of the board. File cmdline.txt from the boot partition 
> should be modified and instructions for serial console should be added 
> as in the example below:
> dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 
> console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 
> init=/lib/systemd/systemd rw rootwait debug
> USB to UART cable with serial output 3.3V voltage levels such as Olimex 
> USB-Serial-Cable-F should be connected to GPIO of RPI2 as follows:
> * The RX line of the cable (GREEN wire if you are using Olimex 
> USB-Serial-Cable-F) should go to pin 8 (TX line) of HummingBoard,
> * The TX line of the cable (RED wire if you are using Olimex 
> USB-Serial-Cable-F) should go to pin 10 (RX line),
> * The BLUE wire if you are using Olimex USB-Serial-Cable-F should go to 
> pin 6 (GND).
> Pay attention that the colours of the cable may vary depending on the 
> vendor. If you have USB console cable from Adafruit please have a look 
> at: 
> https://learn.adafruit.com/adafruits-raspberry-pi-lesson-5-using-a-console-cable/connect-the-lead
> Thanks,
> Leon


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