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Groups > linux.kernel > #1392000
| From | Marek Szyprowski <m.szyprowski@samsung.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: Watchdog reset trigger for eMMC |
| Date | 2016-05-02 08:30 +0200 |
| Message-ID | <rufwK-6Ok-1@gated-at.bofh.it> (permalink) |
| References | <rtwgi-2Us-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi Anand On 2016-04-30 08:06, Anand Moon wrote: > Hi All, > > Using microSD card when I try to write into /dev/watchdog device > it triggers reboot of the board after timer expires. > ----------------------------------------------------------------------------------------------- > root@odroidxu4l:~# echo 3 > /dev/watchdog > [ 1659.021844] watchdog: watchdog0: watchdog did not stop! > root@odroidxu4l:~# > root@odroidxu4l:~# > root@odroidxu4l:~# > root@odroidxu4l:~# > root@odroidxu4l:~# > > U-Boot 2016.03-00665-g563d8d9-dirty (Apr 04 2016 - 22:27:07 +0930) for > ODROID-XU > 3 > > CPU: Exynos5422 @ 800 MHz > Model: Odroid XU3 based on EXYNOS5422 > Board: Odroid XU3 based on EXYNOS5422 > Type: xu4 > DRAM: 2 GiB > ----------------------------------------------------------------------------------------------- > But when I try this on eMMC it just freezes. > I know we have to set and unset gpio pin (SD_0.RST) to trigger reset > before reboot. > ----------------------------------------------------------------------------------------------- > root@odroidxu4e:~# echo 4 > /dev/watchdog > [ 639.192617] [c3] watchdog watchdog0: watchdog did not stop! > root@odroidxu4e:~# > root@odroidxu4e:~# > root@odroidxu4e:~# > ----------------------------------------------------------------------------------------------- > I would like to know what is way board reset after watchdog reset after timeout. In my opinion hw watchdog reset is non-functional on Odroid U3/XU3/XU4 boards due to hardware design (eMMC reset line triggered from software). I see no way to workaround this issue in the software. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
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Watchdog reset trigger for eMMC Anand Moon <linux.amoon@gmail.com> - 2016-04-30 08:10 +0200
Re: Watchdog reset trigger for eMMC Marek Szyprowski <m.szyprowski@samsung.com> - 2016-05-02 08:30 +0200
Re: Watchdog reset trigger for eMMC Anand Moon <linux.amoon@gmail.com> - 2016-05-03 04:40 +0200
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