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2020-01-18documentation: Add documentation on setting up mainboard GPIOsTim Wawrzynczak
The new documentation describes typical ways that mainboards will set up their GPIOs, as well as the distinction between "early" and "normal" GPIOs. It also describes the typical properties that GPIO configuration will cover. Change-Id: I279eec4ed2bb0248a2bdb363fb73b40b8272267f Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Reviewed-on: https://review.coreboot.org/c/coreboot/+/37802 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Justin TerAvest <teravest@chromium.org>