U-Boot version for Arria 10

Hello,
I have the next request. Which is the last valid u-boot version for Arria 10. Without SPL if possible. I am very curious that in the repos mentioned here I have seen a lot of branches including 2017.xx. Note that we are now on socfpga_v2014.10_arria10_bringup.

Cordially
Georgi