Based on SDP. The system is battery powered, using one single cell Li-P battery. Differences with SDP on power section: SDP uses two chargers (MAX8903); whereas my system uses one charger (MAX8903).
Upon power button press, system fails to boot, with LCD and on-board LEDs blinking. Input to PMIC, PMIC switching outputs all exhibit severe dip every 37ms. VSNVS and IMX6_ONOFF also dips slightly. If the battery is removed and re-plugged again, the system can always power up without fail. There are still dips in voltages, but they quickly settle down.
PMIC Input at pin 23 (below):
PMIC switching ouput VDDCORE (below):
VSNVS (powered by external LDO) also dips slightly (below):
If battery is removed and re-plugged, there are a dozen dips and then the supplies all stabilize. The system can always boot up successfully. Shown below is Vin to PMIC:
There was a typo in the title. We are using F0 programmed part. Message was edited by: JIHUA ZHAO