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I got this when the preloader wasn't able to find a valid u-boot. It turned out that I wasn't using the u-boot with the header applied.
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It seem to have a similar problem when I try to use a new version of u-boot. Which header files did you change? I assume you copied files from 'spl_bsp/generated' folder to 'board/altera/socfpga'. Is it correct?
I would hope that default files would boot but I get this repeated over and over regardless which headers I use:
U-Boot SPL 2013.01.01 (Jul 05 2014 - 19:15:46)
BOARD : Altera SOCFPGA Cyclone V Board
SDRAM: Initializing MMR registers
SDRAM: Calibrating PHY
SEQ.C: Preparing to start memory calibration
SEQ.C: CALIBRATION PASSED
ALTERA DWMMC: 0
reading u-boot.img
reading u-boot.img
The older u-boot, which comes with Quartus 13.1 works.
Regards,
Roman