Do you mean the i.MX6 series processors? If so, typically, their GPIO pins (except of some special purpose interface pins such as SDRAM interface pins) are by default configured as GPIO inputs with 100kOhm pull-up resistor enabled. You can exactly define the default pin state by reading the default values of corresponding IOMUXC register and corresponding GPIO controller register, that are listed in corresponding Reference Manual document.
Have a great day,
Artur
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