@Dinosaur Game Hi, welcome to RT-Thread! For the Allwinner T113-S3, you can start by checking the official BSP and example projects provided in RT-Thread Studio or on their GitHub, as they usually include ready-to-build templates. Since you’re coming from KEIL/IAR, it might take a bit of time to get used to the GCC/Eclipse workflow, but the existing demos should help you get up and running quickly.