From mboxrd@z Thu Jan 1 00:00:00 1970 From: maswabey@purdue.edu (Swabey, Matthew A) Date: Sat, 26 May 2018 02:36:57 +0000 Subject: Odroid-C2 solid green screen on "echo c > /proc/sysrq-trigger" on Arch 4.16/4.17rc6 In-Reply-To: References: <84bc747f58f648e1b209bc0005804bc5@wppexc12.purdue.lcl> <5d1512ae-51eb-7e05-ad8b-b8e851aee90e@baylibre.com> Message-ID: <1a951abcb7be4e93945613afcdcd96f3@wppexc12.purdue.lcl> To: linus-amlogic@lists.infradead.org List-Id: linus-amlogic.lists.infradead.org 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 Cc: Swabey, Matthew A ; 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 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 > > > > _______________________________________________ > linux-amlogic mailing list > mailto:linux-amlogic at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-amlogic > _______________________________________________ linux-amlogic mailing list mailto:linux-amlogic at lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic