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  1. I'm trying to write my (Xilinx ISE generated) .bif file to the papilio flash, and xc3sprog gives this Verifying Failure (see below). It seems somehow 6c33 is inserted in the bitstream. After page 245 many more pages fail. Re-trying the same command will fail with the same errors at the same page. I can flash other .bit files, it really seems to be this bit file that is a problem (this .bit file is from a sligtly larger project, maybe it's the size?) The bitfile can be sent to the FPGA directly (without the -I and -R options to xc3sprog) ./xc3sprog -c papilio -I../bscan_spi/bscan_spi_xc3s500e_papilio.bit ~/VHDL/ClkTrig/design_top.bit -v -R [...] Verifying page 244/ 1109 at flash page 244 Verify failed at flash_page 245 read: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 file: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 Attached is the design_top.bit file that causes the problem, and the full output of xs3sprog. I'm using the Papilio One; XC3SPROG © 2004-2011 xc3sprog project $Rev: 691 $ OS: Linux (retrieved from git 17th of april 2013) Ubuntu 13.04 Anyone know a fix? design_top.bit verify-failure.txt