DE1-SoC Board Config

[Jack Frye]

I am trying to build uboot-socfpga for Terasic DE1-SoC board (Cyclone V), booting from SDMMC. I am unable to get u-boot to program the FPGA.
I am following this guide from RocketBoards.
https://rocketboards.org/foswiki/Documentation/BuildingBootloader
with a few addenda. I have successfully built the u-boot-with_spl.sfp file using the configuration socfpga_cyclone5_defconfig. 

I added 
#define CONFIG_BOOTCOMMAND "run callscript"
to socfpga_cyclone5_socsdk.h

I also added 
#define CONFIG_EXTRA_ENV_SETTINGS \
"scriptfile=u-boot.scr" "\0" \
"fpgadata=0x2000000" "\0" \
"callscript=fatload mmc 0:1 $fpgadata $scriptfile;" \
"source $fpgadata" "\0"
to socfpga_common.h

My u-boot script contains the commands
echo --- Programming FPGA ---
# load rbf from FAT partition into memory
fatload mmc 0:1 ${fpgadata} output_file.rbf;
# program FPGA
fpga load 0 ${fpgadata} ${filesize};
# enable HPS-to-FPGA, FPGA-to-HPS, LWHPS-to-FPGA bridges
bridge enable;

When I reach this part of the script, I am seeing 
7007204 bytes read in 366 ms (18.3 MiB/s)
Command ‘load’ failed: Error -6

I have scoured the internet for answers and posted on RocketBoards forums, but no one seems to be able to diagnose the problem. Those who have assisted me have commented they were able to perform this operation using older versions of the tools. The big difference I understand is that now the SOCEDS builds the preloader into u-boot using the filter_qts script. I wonder if there may be some bug or compatibility issue here.

I have also tried using socfpga_de1_soc_defconfig, but I do not see any console output when I boot.