hello! please give me answer to activate imx6ul SBC Pro's expander gpios, which control pci power line (io27)?

hello! please give me answer how to activate imx6ul SBC Pro’s expander gpios, which control pci power line (io27)?
i dont have /sys/class/gpio/gpiochip465 in my Yocto. In kernel 4.1 defconfig i dont see CONFIG_MFD_MCA_IOEXP option

What is the revision of your SBC? IT woulf be on the sticker on the Ethernet connector (1P, 2P, 3P, 4P, A)
If it’s not Rev A, it probably does not have a firmware in IO expander.
Please run sysinfo command in linux and provide output.
You can also open a suport case for this by sending an email to tech.support@digi.com