EIM_OE and EIM_D29 Togling before uboot

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EIM_OE and EIM_D29 Togling before uboot

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sagar_kumar
Contributor I

Hi 

We define EIM_OE and EIM_D29 as a GPIO to drive enable pin of LCD Driver IC which is having power sequencing. 

But before reaching my code till uboot, these pins are get toggled by default and its violate the power sequence.

Please let us know who is driving the GPIO beofre my code reach at those lines in uboot. After uboot we ae getting same sequence which i defined in my code. but beofre that someone is toggling those pins.

Thanks

Sagar

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Sagar

in general pins can toggle until completion power-up sequence, also

recommended to power-up VDD_HIGH_IN in first steps, probably along

with VDD_SNVS_IN as recommends sect.4.2.1 Power-Up Sequence

i.MX 6Dual/6Quad Applications Processors for Consumer Products - Data Sheet.

Best regards
igor
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