Hi,
just in case someone (could be me) needs an additional piece of information about the flash interface of Renesas USB3 uPD720201.
https://git.linaro.org/people/john.stultz/android-dev.git/commit/?h=dev/db84... is "usb: renesas-xhci: Add ROM loader for uPD720201" and contains GPLv2 code for parts of the SPI flash interface of the uPD720201.
Regards, Carl-Daniel