chipsalliance/f4pga-examples

JTAG init failed with: unable to open ftdi device

wdb870914NYCU opened this issue · 2 comments

wdb870914NYCU commented

When I download the bitstream file, it says:

unable to open ftdi device: -3 (device not found) 
JTAG init failed with: unable to open ftdi device

I'm using Arty-A7-35T
Do I need to install any driver for the board? Like Vivado?

Thanks

wdb870914NYCU commented

After I installed JTAG cable driver from Xilinx,
the error becomes

unable to open ftdi device: -4 (usb_open() failed)
JTAG init failed with: unable to open ftdi device
wdb870914NYCU commented

I fixed this problem by running make download as root (Of course, I need to run conda env in root).
I don't know if it can work without Xilinx JTAG cable driver.
Maybe you can add more prerequisites or hints in the example documentation, including:

  • Install Cable Driver (Not sure it is necessary)
  • make download as root