Xloader that boots BL2 from UFS LUN1

Hello! I know the HiKey960 xloader is closed source. Is there any way to ask for an alternate version that boots the ARM-Trusted-Firmware BL2 from the UFS’s LUN1? Right now my best guess is it looks for a GPT partition named “fastboot” on LUN3.

I realize this is a far-fetched request, but my goal is to boot from LUN1 so I can write-protect this area and use it as a root-of-trust for ATF. The ATF BL2 code reads the fip from UFS LUN3.