R-Car/Boards/Yocto-Gen3-CommonFAQ/Kernel boot is delay due to usb3.0 host firmware is missing when using upstream kernel on Kingfisher

Kernel boot is delay due to usb3.0 host firmware is missing when using upstream kernel on Kingfisher
kernel boot is delay about 60sec after the message "xhci-hcd ee000000.usb: Falling back to sysfs fallback for: r8a779x_usb3_v3.dlmem" is shown.

If you use upstream kernel with Kingfisher, modifying kernel option is required to avoid this wait-time. Please add following options to kernel config.