Odroid-C2 solid green screen on "echo c > /proc/sysrq-trigger" on Arch 4.16/4.17rc6

[maswabey@purdue.edu (Swabey, Matthew A)]

I just had a look at the Arch linux PKGBUILD for the uboot package I am using, and it is mainline 2017.07. So I am using the mainline uboot, just a bit older.

I?ll give Armbian a try ? is it the distro wit1h the most development so far? (Other than the 3.14.x releases which I would prefer not to use for now).

Matthew

Dr. Matthew Swabey - Director?
Bechtel Innovation Design Center - Purdue University
room: BIDC 225? ? ? phone: +1-765-494-8655

From: Tony McKahan [mailto:tonymckahan at gmail.com] 
Sent: Friday, May 25, 2018 3:46 PM
To: Neil Armstrong <narmstrong@baylibre.com>
Cc: Swabey, Matthew A <maswabey@purdue.edu>; linux-amlogic at lists.infradead.org
Subject: Re: Odroid-C2 solid green screen on "echo c > /proc/sysrq-trigger" on Arch 4.16/4.17rc6

Hello Neil, Matt,

Change to 2018.03 is in Armbian's development branch, just waiting to be rolled into the master.? I don't have this particular board for testing, but it should be updated soon.

On Fri, May 25, 2018, 3:57 AM Neil Armstrong <mailto:narmstrong@baylibre.com> wrote:
Hi,

On 25/05/2018 04:19, Swabey, Matthew A wrote:
> Odroid-C2 solid green screen on echo c > /proc/sysrq-trigger on Arch Linux mainline 4.16/4.17rc6
> Using lightdm on xorg fb. No mali, utgard or odroid specific framebuffers. However it seems to happen on them too.
> 
> Steps to reproduce:
> 1. Boot
> 2. Echo c > /proc/sysrq-trigger with watchdog set. Or trigger the watchdog another way, i.e. watchdogd or system.
> 3. Watchdog causes reboot
> 4. Boots with screen solid green, see photo here: https://photos.app.goo.gl/9VyiweNAIMD07VSM2
>? ? ? ?a. No error messages visible, see attached log file bundles containing dmesg, journalctl, package list, Xorg.0.log
>? ? ? ?b. Linux-aarch64 is 4.16
>? ? ? ?c. Linux-aarch64-rc is 4.17rc6
> 5. Reboot - screen back to normal and working
Well, since screen goes back to normal means there is no bug on the kernel side.

This is caused by Amlogic's U-Boot.
The HW watchdog does a complete SoC reset, we cannot execute any code from kernel when the watchdog wakes up.

Please report this to Armbian and ask them to use Mainline U-Boot, this won't happen anymore.

Neil

> 
> Thought - something about the way to trigger this reset isn't working, or a race condition is present which is being more reliably triggered? Perhaps in the dma controller or the HDMI?
> 
> Any help to track this bug down would be very helpful, or someone else who would be interested? I can't figure out where in the stack the problem is occurring, but I guess it is the bootloader.
> 
> Thanks,
> 
> Matthew
> 
> 
> 
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