From mboxrd@z Thu Jan 1 00:00:00 1970 From: narmstrong@baylibre.com (Neil Armstrong) Date: Tue, 5 Jun 2018 11:17:03 +0200 Subject: Odroid-C2 solid green screen on "echo c > /proc/sysrq-trigger" on Arch 4.16/4.17rc6 In-Reply-To: <176f036c3d2f49a4b5bde68bdee68e6a@wppexc12.purdue.lcl> References: <84bc747f58f648e1b209bc0005804bc5@wppexc12.purdue.lcl> <5d1512ae-51eb-7e05-ad8b-b8e851aee90e@baylibre.com> <1a951abcb7be4e93945613afcdcd96f3@wppexc12.purdue.lcl> <1f8eaec9-e3a2-1b9b-1cef-ed3567a96aa2@baylibre.com> <179a8a16-30a9-73fc-7f07-beeab3a981dc@poczta.onet.pl> <176f036c3d2f49a4b5bde68bdee68e6a@wppexc12.purdue.lcl> Message-ID: <6353008e-35a9-bb3e-f52c-97191ddb60a3@baylibre.com> To: linus-amlogic@lists.infradead.org List-Id: linus-amlogic.lists.infradead.org Hi, Having the watchdog to reset the board is an exceptional event, why would you bother fixing this ? Neil On 04/06/2018 23:22, Swabey, Matthew A wrote: > Well, as an update. > > Using arch linux for arm, modified their PKGBUILD to build u-boot 2018.05 with no patches at all. Signed and wrote to SD-CARD as per usual. > > Green screen on echo c > /proc/sysrq-trigger after watchdog reset. > No green screen on shutdown -r > > Temporary solution for me will be to play a "double reboot" game with a fingerprint file to see if it was shutdown cleanly or not. > > Best, > > Matthew > > Dr. Matthew Swabey - Director? > Bechtel Innovation Design Center - Purdue University > room: BIDC 225? ? ? phone: +1-765-494-8655 > > -----Original Message----- > From: Micha? Zegan > Sent: Saturday, May 26, 2018 4:50 AM > To: Neil Armstrong ; Swabey, Matthew A ; Tony McKahan > Cc: 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 > > What about the *kernel* resetting at boot? > > W dniu 26.05.2018 o?10:33, Neil Armstrong pisze: >> Hi, >> >> I'm sorry to disappoint you, but with the HW watchdog, we *can't* execute any code from Linux when the watchdoog resets the system. >> We could eventually add some code in U-Boot to disable the HDMI output, but U-boot is not the first code executed, you will still see the green screen. >> You may need to contact Hardkernel to see if they can update the BL* binaries to include such reset. >> >> Neil >> >> On 26/05/2018 05:49, Swabey, Matthew A wrote: >>> Can also confirm green screen on watchdog reboot from "echo c > /proc/sysrq-trigger" for Armbian 5.44 with linux-u-boot-odroidc2-next version 2018.03. >>> >>> This is in addition to the Armbian bug where shutdown -r now doesn?t reboot the system, just either freezes or powers down. Supposed to be fixed on 2018.03 but not working for me. >>> >>> Matthew >>> >>> Dr. Matthew Swabey - Director >>> Bechtel Innovation Design Center - Purdue University >>> room: BIDC 225? ? ? phone: +1-765-494-8655 >>> >>> -----Original Message----- >>> From: linux-amlogic >>> [mailto:linux-amlogic-bounces at lists.infradead.org] On Behalf Of >>> Swabey, Matthew A >>> Sent: Friday, May 25, 2018 10:37 PM >>> To: Tony McKahan ; Neil Armstrong >>> >>> Cc: 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 >>> >>> 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 >>> _______________________________________________ >>> linux-amlogic mailing list >>> linux-amlogic at lists.infradead.org >>> http://lists.infradead.org/mailman/listinfo/linux-amlogic >>> >> >> >> _______________________________________________ >> linux-amlogic mailing list >> linux-amlogic at lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-amlogic >> >