We have a design that is using the MCIMX6S5DVM10AC device with PMIC MMPF0100F6AEP. On initial power up, the system does not boot. When the board is powered up, we issue a manual POR to the IMX6 and then the system boots up properly. Why do we need to issue a second POR to IMX6?
When the POR is extended to about 2sec relative to PMIC PWR_ON, the system is booting properly from initial power up. Is this extended POR required for the proper system boot up? What is the required time for the IMX6 POR relative to the PMIC PWR_ON? Any recommendation what else is causing the failed boot up on initial power up?