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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
11 years ago

USB-Blaster: Unable to read device chain - JTAG chain broken

I'm using Ubuntu14.04 and quartus14.1. When I run jtagconfig, I get: $ jtagconfig 1) USB-Blaster [3-6] Unable to read device chain - JTAG chain broken The hardware is correct becaus...
jobonono's avatar
jobonono
Icon for New Contributor rankNew Contributor
5 years ago

Hi @SThor8

I tried implementing your solution on my Ubuntu 20.04 machine, but I get an

Command 'jtagd' not found

error.

Any suggestions on what to do?

I can get the USB-blaster to work very sporadically, fiddling with plugging the usb cable in/out of the pc and powering the FPGA on/off

SThor8's avatar
SThor8
Icon for Occasional Contributor rankOccasional Contributor
5 years ago

I do nto have the 'jtagd' command either but 'killall jtagd' works

I do not know why it is so

  • hxj141's avatar
    hxj141
    Icon for New Contributor rankNew Contributor
    5 years ago

    You have to run it from the file locally. First cd into the directory where you have Quartus installed and then to go to {whatever version number it is}/quartus/bin.

    Check if the jtagd file is there with the command ls, and if it is, simply do the command he posted above but with ./jtagd in the front instead of just jtagd. This'll execute the file as if it was a command

  • CUAlex's avatar
    CUAlex
    Icon for New Contributor rankNew Contributor
    5 years ago

    All of the above solutions do not seem to be working. My error message alternates between JTAG chain broken, and Port Permissions Denied.