[U-Boot-Users] How to + USB-Uboot

Hi All, I want to develop USB-Uboot in Linux for an OTG Controller. But I am not sure from where to start.. Please, help for getting started.. how to test any existing platform with USB-Uboot, please suggest platform and any link to test?

Please, point to any good document which explains basic concepts of USB-Uboot.

In what situation USB should work in Host mode for U-boot.? In what situation USB should work in Device mode for U-boot.?

Is there any specific framework for USB-Uboot if I want to develop for new controller?

Lot thanks for any Help.

Thanks and Regards, Shivdas Gujare