Linux Logic Analyzer tutorial done.

I’ve finished the screencasts for running the Logic Analyzer under Linux and have posted them to the tutorials page. I have some more screencasts that I want to record later, they are:

  • Saving a Xilinx design as a svf file that the Linux and Windows Butterfly loader can load onto the Butterfly Light hardware.
  • Using the Xilinx tools with the Butterfly Light hardware. libftdi can fool the Xilinx software into thinking an official Xilinx programming cable is attached. You can use Impact, EDK, and chipscope under Linux with this patch. It is very slow though, I haven’t done much testing besides programming with Impact.

Next steps are to figure out a way for people to post their own tutorials, links, and fpga information. Abhijit Bose is currently studying VHDL and has a lot of great resources that he would post to help other people who are new to VHDL.

I also have been delayed in working on the Butterfly Platform specification. I wanted to have this done by the end of the week but it is looking like I need to reset that expectation. The Linux stuff took way longer than expected.

Almost done with Linux environment for Butterfly Platform.

Finally got urjtag working under Linux and am currently packaging up urjtag and the Logic Analyzer into an easy to use package. Getting urjtag to work under Linux took longer than expected because of a bug that causes svf files to load too fast under linux.

I finally found a forum thread that described the problem I was having. I was able to program a svf file if I changed the programming frequency to 300kHz but not at the default 1MHz that works fine in Windows. Turned out the precompiled version of urjtag that I was using for Windows was patched to fix the problem. I was able to track down the patch and apply it for Linux and all is well and working now.

Once this is finished I will be moving on to documenting the Butterfly Platform specification and asking for people to look it over. My goal is to have that finished by the end of the week.

Jack.