Platform resource link: https://www.nuvoton.com/products/microprocessors/arm-cortex-a35-mpus/
BSP link: https://www.nuvoton.com/export/resource-files/en-us--UM_EN_MA35D1_U-boot.pdf
Brief:
Nuvoton provides NuMaker-MA35D1 series U-Boot user manual on our website
Click BSP link to download the document