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How To Test WRT54G Serial Port Modification

Discussion in 'Cisco/Linksys Wireless Routers' started by BobCochran, May 29, 2005.

  1. BobCochran

    BobCochran Network Guru Member

    I just did Rod Whitby's Dual Serial Port modification which is here:


    Now I would like to test whether my serial port really works on my WRT54G v2. How can I do that? Do I need to open a serial console with minicom first? What would be a good test procedure? I'm using Satori-4.0 firmware.

    Thanks a lot for any advice and help that can be offered.
  2. jagboy

    jagboy Network Guru Member

    i think you use hyper terminal or something
  3. BobCochran

    BobCochran Network Guru Member

    Serial Port Mod -- It Seems To Work!

    I'm happy to report that the serial port modification seems to work. I took the WRT54G board out of it's case and put it in a PanaVise clamp. Then I connected the ribbon cable from the modified AD233BK to the freshly installed IDC header on JP1 of the WRT54G. I connected a serial cable from the serial port on my PC (I'm a Linux user, and the PC serial port I used is /dev/ttyS1) to the DB9F adapter on the other end of the AD233BK. Then I opened a minicom terminal and made sure the connection parameters were set to 115200, 8-N-1. When all seemed readiy, I plugged in power to the WRT54G board using the power supply that came with the device. Presto! There was a flood of output as the board booted up. I was seeing standard Linux kernel messages as the board booted. It then paused for a second and I think it was expecting me to issue a tftp incantation of some sort.

    I still need to investigate more and practice flashing firmware from a serial console in case I brick the unit. Also, it would be very nice if I can get a shell prompt and be able to explore a little more. I have taken photos of the modification process and I'll try to post them in the next few weeks.

    One last technical note, I'm a Fedora Core 3 user and if you try to access the serial port on your PC as an ordinary user, you will be denied. To change this, edit /etc/udev/permissions.d/50-udev.permissions. This line:


    needs to change to this:


    I wanted to have udev make use of the new permissions without spending a lot of time researching how to restart udev, so I simply rebooted the PC, and that worked fine.

  4. jagboy

    jagboy Network Guru Member

    good to hear it worked

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