rock 5b

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yay -S rkdeveloptool
# 按住板子上的 Maskrom mode 键, 把 usb type a to c 插头插到电脑上, 放开 maskrom mode 键
lsusb
# result: Bus 001 Device 112: ID 2207:350b Fuzhou Rockchip Electronics Company
sudo rkdeveloptool ld