Orange Pi 4 (Rockchip 3399) USB

The Rockchip RK3399 has two host USB 2.0 controllers and two USB 3.0 OTG controllers. One of the OTG controllers is routed to a USB-C and the bootrom is capable of doing things with it.

• linux -- host side
• linux -- my home PC
• linux and RK3399 usb devices
• RK3399 and the Synopsys usb USB devices

• USB firmware download
• My notes on rkdeveloptool
• My notes on rkflashtool (not useful for me)
• USB booting and U-Boot (for the future)

• USB made simple (part 4 - protocol)

Right now I am studying the bootrom code.