Unable to program Arria 10 FPGA from Linux

[Altera_Forum]

I've asked this question on the rocketboards forum, but thought I'd repeat it 

here. The rocketboards post is here https://forum.rocketboards.org/t/unable-to-program-arria-10-fpga-from-hps-linux/693/3.   I'm trying to program the FPGA on an Arria 10 SoC Development Kit (DK-SOC-10AS066S-A). However I'm not able to access the /dev/fpga0 device.   I am able to boot into linux on the board and ssh in as root.   I've flashed the SD card with sdimage.img from linux-socfpga-gsrd-16.0-a10-bin.tar.gz (revision B as I have the ES2 kit). I've also tried with linux-socfpga-sgmiird-16.0-a10-bin.tar.gz with identical results.   I've transferred the hello world program to the board as "hello.rbf".   dd if=hello.rbf of=/dev/fpga0 fails with dd: can't open '/dev/fpga0': Operation not permitted.   cat /sys/class/fpga/fpga0/status outputs user mode   There are no bridges enabled, ls /sys/class/fpga-bridge shows nothing.   The switch and jumper configuration on the board:    SW1: OFF OFF ON ON SW2: All OFF SW3: OFF OFF ON ON ON OFF OFF OFF SW4: All OFF     Jumpers J16 and J17 are shorted. Jumper J30 is shorted. Jumper J32 is shorted across 9 and 10. Jumper J42 is shorted across 9 and 10.    The instructions here https://rocketboards.org/foswiki/view/documentation/gsrdprogrammingfpgaarrowsockitedition#fpga_configuration_from_linux suggest stopping the boot at UBoot to prevent UBoot from flashing the fpga.   I've attempted to stop the boot there, but the "press any key" prompt happens after it flashes socfpga.rbf to the FPGA. Removing socfpga.rbf from the disk causes UBoot to loop with this output:    U-Boot 2014.10 (May 03 2016 - 09:43:56) CPU : Altera SOCFPGA Arria 10 Platform BOARD : Altera SOCFPGA Arria 10 Dev Kit DRAM: WARNING: Caches not enabled SOCFPGA DWMMC: 0 Error - socfpga.rbf not found within SDMMC cff_from_mmc_fat: error reading rbf header INFO : Skip relocation as SDRAM is non secure memory Reserving 2048 Bytes for IRQ stack at: ffe2db10 data abort pc : lr : sp : ffe3bf00 ip : 0000001c fp : 00000001 r10: ffd02078 r9 : ffe3bf60 r8 : ffe00054 r7 : ffe20b60 r6 : ffe3c000 r5 : 00000000 r4 : ffffd000 r3 : ffcfb000 r2 : 00000002 r1 : 00000001 r0 : 00000001 Flags: nzcv IRQs off FIQs off Mode SVC_32 Resetting CPU ...    Replacing socfpga.rbf with my hello world file does what I expect it to (displays a binary counter on the LEDS), however u-boot does not proceed beyond flashing the FPGA.   I am able to use the example programs (blink, syschk) in /home/root/altera without problems.   Please let me know if there is any more useful information I can provide.