I'm trying to do something I think should be simple. I've seen several posts about building custom jtag programmers using byte blaster emulators or xilinx jdrive software, etc. so I hope somebody has already solved this.
I have 4 user I/O pins on my V4FX12 device attached to my JTAG scan chain. I want to drive these lines to reprogram the XCF32P prom which my fpga boots from. I am running Linux on the PPC inside the FX12 so I'm thinking I can just cross compile some existing programmer and replace some low level functions (set tdo, read tdi, set/clear tms).
Does anyone have something like this? Or can suggest what programmer code is most likely to work in this application?
Thanks, Clark