GPIO setting method of embedded system

A GPIO setting method of embedded system, the embedded system includes a storage unit, and a processing unit electrically connected to the storage unit. The storage unit stores a plurality of device tree source code files respectively corresponding to a plurality of different setting modes, the method includes the following steps: (A) The processing unit performs a mode setting operation related to setting a target setting mode according to a setting instruction corresponding to the target setting mode, and restarts; and (B) The processing unit executes a boot loader, and loads a target device tree source code file corresponding to the target setting mode according to the mode setting operation.