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I'm trying to build the ./bscan_spi_xc6slx9.bit file from source, to program the flash on my Papilio Pro board. From the git source, the only .v or .vhdl source file for Spartan 6 is: ./xc3sprog/trunk/bscan_spi/bscan_s6_spi_isf_ext.v Is this the one I should use? Then for the User Constraints File, the only relevant one I can find is the generic one, The two files obviously don't match, so I from the .ucf file I removed everything except the FLASH_* lines. And in the .v file, I replaced all the MOSI/MISO lines with the FLASH_SI/SO etc lines, like: module top ( output wire FLASH_SI, //MOSI, output wire FLASH_CS, //CSB, output wire FLASH_CK, //DRCK1, input FLASH_SO //MISO ); (and all other places) The resulting .v & .ucf files do generate a bscan .bit file, but when I use that to program the flash, I get this: ./papilio-prog -f ../Helper_App/Quickstart-Papilio_One_LX9-v1.5.bit -b ~joostje/VHDL/bscan-Papilio/top.bit -v Using built-in device list JTAG chainpos: 0 Device IDCODE = 0x24001093 Desc: XC6SLX9 Uploading "/home/joostje/VHDL/bscan-Papilio/top.bit". DNA is 0xb9c95021930a5ffe Done. Programming time 547.0 ms Programming External Flash Memory with "../Helper_App/Quickstart-Papilio_One_LX9-v1.5.bit". Uknown Flash Manufacturer (0x00) Error: SPI Status Register [0x00] mismatch (Wrong device or device not ready).. Error occured. USB transactions: Write 178 read 10 retries 8 Using the original bscan_spi_xc6slx9.bit does work: As for the reason why I want to build the source (apart from "I should be able to"), I'm using a modified Papilio board design with a Spartan XC6SLX16 (256 pin BGA), So I need to generate a new bitfile for that XC6SLX16. So, doesn anyone know where the .v or .vhdl source files (preferably with a .ucf file) are that can generate a .bit file for the Spartan 6 (Papilio Pro)? Papilio-Loader source was this morning cloned from here: https://github.com/GadgetFactory/Papilio-Loader.git (I've attached my modified .ucf and .v files, both renamed to .txt as the uploader didn't like my .ucf extention) Thanks, joost BPC3011-Papilio_Pro-general.txt bscan_s6_spi_isf_ext.txt