imx6ul linux watchdog issue with qspi

[stevemilleratwr]

I'm working on an imx6ul based off the NXP imx6ul-evk.  One difference is the qspi nor is a different device (JEDEC 20bb19 instead of 20ba19).  When the qspi is included and initialized, the watch dog fails to reboot the board during a "shutdown -r now".  Same kernel (slightly different dtb) works find on the imx6ul-evk.

I see some comments regarding watchdog and qspi for the imx6sx. 

      /*

         * Some i.MX6 boards use WDOG2 to reset external pmic in bypass mode,

         * so do WDOG2 reset here. Do not set SRS, since we will

         * trigger external POR later. Use WDOG1 to reset in ldo-enable

         * mode. You can set it by "fsl,wdog-reset" in dts.

         * For i.MX6SX we have to trigger wdog-reset to reset QSPI-NOR flash to

         * workaround qspi-nor reboot issue whatever ldo-bypass or not.

         */

Is there something similar to watch for on the imx6ul?  Here is comment from mxc_restart in "arch/arm/mach-imx/system.c"

[igorpadykov]

Hi Steve

on i.MX6UL EVK wdog reset acts as POR, on  p.10  SPF-28617

schematic, toggling DCDC_3V3 which provides power also for qspi.

So it start to work as at power-up.

Also one can check below warning from i.MX6UL RM:

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------