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mPCIe reset issue

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Posted at 9/27/2018 18:05:15     
    I use a mPCIe to M.2 adapter for mPCIe card, I can't detect the device on the Android which version is Firefly-RK3399_Android7.1.2_MP_180802.img. But when I change the version to Firefly-RK3399-ubuntu16.04-edp-20180118.img, the card can be detected by lspci command.
   I use the oscilloscope to measure the power and reset pins on the mPCIe card.
1.Android  : The power(3.3V) and reset pins(1.8V) are pulled high after system power on.
2.Ubuntu   : The power pin is pulled high after system power on, after 100ms , the reset pin is pulled download from 1.8V to 0V, and after 40ms , reset pin is pulled high from 0V to 3V.
How can I do the pull low and high of reset pin in android.
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Posted at 9/30/2018 10:55:43     
http://en.t-firefly.com/doc/product/info/id/458.html

If use adb shell for control it , just use linux kernel GPIO Export function.
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