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imx6 DDR Stress Test Restart -- Watchdog?

Question asked by Jason Schneider on Mar 20, 2020
Latest reply on Mar 23, 2020 by Jason Schneider

I see that my device is resetting at 128s once I execute the DDR Stress Test file :   ddr-test-uboot-jtag-mx6dl.bin

Which I believe is caused by the watchdog timer not being serviced since 128s is the max for the imx6 watchdog timer.


 Using the uboot option (Option 3) here:

i.MX6/7 DDR Stress Test Tool V3.00 


We are using an extended temperature imx6

CPU: Freescale i.MX6SOLO rev1.2 996 MHz (running at 792 MHz)
CPU: Extended Commercial temperature grade (-20C to 105C) at 35C


In uboot the code turns off the watchdog, is there a way to check that in Uboot?   I can wait sit in Uboot many minutes without executing a command and not get a restart.  But once I execute the go instruction to start the DDR Stress Test code, the device always resets after 128s.   It does not matter if I run the Calibration Test first or if I skip it and go straight to the Stress test.    Always get a reset after 128s.


Is the watchdog getting enabled in the Stress test?    What can I look at to see if its the watchdog?



=> icache off
=> dcache off

=> ext4load mmc 0:1 0x907000 /ddr-test-uboot-jtag-mx6dl.bin
71812 bytes read in 161 ms (435.5 KiB/s)
=> go 0x907000
## Starting application at 0x00907000 ...

<<<<<   128s later device will reboot, operation does not matter >>>>