Notepad of a tinker, maker, hacker or whatever you call it :)

FTDI troubles and Mac OS X

I recently bought an SSD for my old Apple computer. I updated the system from Snow Leopard to Yosemite as some applications requires a newer system.

Two weeks after I found that my FTDI chip (serial to USB converter) was faulty. Use another, same problem. After a quick loop with an oscilloscope, the reset signal was not good...
After a look on the internet, I found thah Apple now develops its own drivers but they which are faulty :/

So the workaround is to

  • Disable Apple's driver by copy/pasting the following command in a terminal
  • Reboot
  • Install the driver from FTDI, which is signed in case you care about :)
sudo mv /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBFTDI.kext /System/Library/Extensions/IOUSBFamily.kext/Contents/PlugIns/AppleUSBFTDI.disabled

This article has been written about Yosemite v10.10.4 and FTDI driver 2.3.
Also even if this should be safe, backup you files !