Hi Marek On 2 May 2016 at 11:57, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote: > 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 > Yes It's difficult to reset eMMC card. Thanks for clarification. Best Regards -Anand Moon -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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