Cyclone-V-SoC: U-Boot fails to fpga load .rbf file - Command 'load' failed: Error -6 - Cyclone-V-SoC: U-Boot fails to fpga load .rbf file - Command 'load' failed: Error -6 Greetings everyone, Currently I am experiencing a persistant issue with a QMTech Cyclone V SoC board (a very close clone of Terasic De10-Nano) , trying to load the fpga configuration (.rbf) while the board is booting (U-Boot). While the .rbf is being loaded , I get an error : 'Command 'load' failed: Error -6' . -Boot SPL 2024.07-36780-g67806ba5853-dirty (May 09 2026 - 16:08:17 +0300) Trying to boot from MMC1 U-Boot 2024.07-36780-g67806ba5853-dirty (May 09 2026 - 16:08:17 +0300) CPU: Altera SoCFPGA Platform FPGA: Altera Cyclone V, SE/A6 or SX/C6 or ST/D6, version 0x0 BOOT: SD/MMC Internal Transceiver (3.0V) DRAM: 1 GiB Core: 29 devices, 15 uclasses, devicetree: separate MMC: dwmmc0@ff704000: 0 Loading Environment from MMC... Reading from MMC(0)... *** Warning - bad CRC, using default environment In: serial Out: serial Err: serial Model: QMTECH C5SOC KFB Dual SDRAM Net: Error: ethernet@ff702000 No valid MAC address found. No ethernet found. Hit any key to stop autoboot: 0 => => => => => => fpga info Altera Device Descriptor @ 0x3ffec7a0 Family: SoC FPGA Interface type: Fast Passive Parallel (FPP) Device Size: 4294967295 bytes Cookie: 0x0 (0) No Device Function Table. => => fatls mmc 0:1 6275664 zImage extlinux/ 2082772 soc_system.rbf 25844 socfpga_cyclone5_kfb_dual_sdram.dtb 3 file(s), 1 dir(s) => load mmc 0:1 ${loadaddr} soc_system.rbf; 2082772 bytes read in 111 ms (17.9 MiB/s) => fpga load 0 ${loadaddr} $filesize; Command 'load' failed: Error -6 => => => run mmc_boot switch to partitions #0, OK mmc0 is current device ... ... So I would appreciate it greatly, if somebody could navigate me to what to do to overcome this final stage - to get everything working succesfully. Best Regards, - Monk M. Replies: Re: Cyclone-V-SoC: U-Boot fails to fpga load .rbf file - Command 'load' failed: Error -6 Hello there YoshiakiS, Thank you for the quick reply. Yes, please feel free to close this current topic/thread, as I am using the other one - A topic explaining a problem with Cyclone V SoC - u-booting .rbf file failure - got rejected. | Altera Community - 353020 - for communicating my issue. Cheers, - Monk Replies: Re: Cyclone-V-SoC: U-Boot fails to fpga load .rbf file - Command 'load' failed: Error -6 Hello monkstein88, Would we like to close this case because your issue is handling on the other topic? Best regards, Yoshiaki Saito