Hi sgannava,
Do you have the file "fit_spl_fpga.its" in your directory inside path below?
a10_example.qspi\a10_soc_devkit_ghrd\software\bootloader\u-boot-socfpga\board\altera\arria10-socdk
And before that did you manage to build the Uboot?
Thanks.
Regards,
Aik Eu