In order to achieve reliable power control and RTC the following pins on Pi is used by Pi-desktop. Except the two pins of I2C, please do not use the other pins listed in the table,otherwise there may be a problem. And the I2C pin just can be used as I2C but can not be General IO.
|GPIO||Fuction on Pi-desktop||Detials|
|GPIO6||Pin2||The state of Pi,was read by the MCU|
|GPIO13||Pin1||The pulse signal from MCU to Pi|
|GPIO17||RTC_INTn||interrupt signal of RTC|
|GPIO2||RTC_SDA/MCU_SDA||SDA for both RTC and MCU|
|GPIO3||RTC_SCL/MCU_SCL||SCL for both RTC and MCU|
|GPIO26||INT_MCU||A gpio connected to MCU(reserved)|
|GPIO19||NRST_MCU||Rest of MCU|
About the The Safety Power Control please refer to The Safety Power Control for Pi-desktop.