There is no much additional information about the GPMI, nevertheless
the following may be helpful.
https://community.freescale.com/message/379149#379149
Also, please refer to examples in the Platform SDK. Please take a look at
Chapter 13 (Configuring the GPMI Controller) of "iMX6_Firmware_Guide.pdf".
The SDK link :
"Bare-metal SDK for the i.MX 6 series, including reusable drivers and tests for
many peripherals, and much example code. Also includes register definition
headers files, and register definitions for debuggers"
https://www.freescale.com/webapp/Download?colCode=i.MX6_PLATFORM_SDK&location=null
Have a great day,
Yuri
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