[MinnowBoard] GPIO mapping

[Hay Nguonly]

Hi,

Could someone please tell me how the GPIO mapping works?
For example pin 21 of the Low Speed header is mapped to GPIO 82 for Linux 3.17, or 338 for Linux 3.18, but the pin name on the CPU is called GPIO_S5_0.
Where can I find that cross reference, or algorithm for that GPIO mapping?

Thanks
Hay

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