Trouble with setting the GPIO pin value

[alam1]

Hi

I am new to embedded system.

I am using i.mx6dl on a custom board running ubuntu 16.04.

Linux kernel: 4.1.15

I have to integrate murata wifi module using sdio interface for which the gpio pin number 33 and 116 has to be low during bootup.

I have tried the make them low in the following manner

I checked the status of gpios. I can see 33 and 116 are set to low

But after rebooting it and again I checked the status. Those pins are not present.

I checked those pins using multimeter, they are still high.

How can I make them low during boot up.

Thanks

[igorpadykov]

Hi alam1

pins state is not retained  after rebooting, it is set to values described in

Table 97. 21 x 21 mm Functional Contact Assignments, column "Out of Reset Condition"

i.MX 6Solo/6DualLite Applications Processors for Consumer Products

Best regards
igor

[alam1]

Hi igor

I checked the table which you have mentioned.

The pins are set to high.

How can I make them low?

I tried to make low from uboot, still the problem is not solved.

[igorpadykov]

>How can I make them low?

there is no way to change it after reset, as it is defined in hardware.

One can set necessary value for example in uboot/

Best regards
igor

[alam1]

I made them low from uboot.

But the issue is its still high after reboot.

I checked it with multimeter.

I want to the pins to low during bootup and then get high.

Is this possible??

Thanks

[igorpadykov]

no this is not possible as it is defined in hardware.

Best regards
igor