<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> <div class="moz-cite-prefix">On 05/04/2018 04:53 PM, Michael wrote: </div> <blockquote type="cite" cite="mid:d2d8b363-0100-6c76-314b-6f68dabba6c7@dkey.org"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <div class="moz-cite-prefix">On 05/04/2018 03:08 PM, Rob Austein wrote: </div> <blockquote type="cite" cite="mid:20180504200842.0A01B2003E421D@minas-ithil.hactrn.net"> <pre wrap="">Sounds like the padding problem Paul fixed months ago:</pre> </blockquote> What are we padding with 0xFF? That's what used to generate the PROM file in Impact. <blockquote type="cite" cite="mid:20180504200842.0A01B2003E421D@minas-ithil.hactrn.net"> <pre wrap=""> <a class="moz-txt-link-freetext" href="https://wiki.cryptech.is/changeset/b35b87ea14016760786319a23b87792f1e1041de/sw/stm32#file1" moz-do-not-send="true">https://wiki.cryptech.is/changeset/b35b87ea14016760786319a23b87792f1e1041de/sw/stm32#file1</a> You might want to update the ARM firmware before testing FPGA upload. </pre> </blockquote> </blockquote> So I updated ARM firmware. Now either method , Impact using .mcs PROM file or cryptech_upload using the .bit file load the bitstream memory with a file that operates the cores correctly. However I am still unable to prove that both methods create the exact same image. To double check against the checksum difference , I performed a readback with both loading methods and there are significant differences. Is the cryptech method performing some obfuscation method to prevent reverse engineering? I'm really stumped on how to prove the cryptech method for programming the PROM matches the original .bit file..... <blockquote type="cite" cite="mid:d2d8b363-0100-6c76-314b-6f68dabba6c7@dkey.org"> <fieldset class="mimeAttachmentHeader"></fieldset> <pre wrap="">_______________________________________________ Tech mailing list <a class="moz-txt-link-abbreviated" href="mailto:Tech@cryptech.is">Tech@cryptech.is</a> <a class="moz-txt-link-freetext" href="https://lists.cryptech.is/listinfo/tech">https://lists.cryptech.is/listinfo/tech</a> </pre> </blockquote> </body> </html>