Watchdog reset trigger for eMMC

[Anand Moon]

Hi All,

Using microSD card when I try to write into /dev/watchdog device
it triggers reboot of the board after timer expires.
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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
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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.
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root@odroidxu4e:~# echo 4 > /dev/watchdog
[  639.192617] [c3] watchdog watchdog0: watchdog did not stop!
root@odroidxu4e:~#
root@odroidxu4e:~#
root@odroidxu4e:~#
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I would like to know what is way board reset after watchdog reset after timeout.

Best Regards
-Anand Moon