El Capitan - Arduino IDE serial port problems

Using Arduino IDE 1.x
21

Hi OldSteve,

  1. Chinese clone.
    Thanks for the catch. I followed Nick Gammon's instructions, and can update at the 2560 boot loader from a redboard (uno) . I have another issue where a sketch can upload to the 2560 only once with a fresh boot loader.

See

[Topic: Upload Timeout Error on Mega 2560 - Not Sure What Changed] https://forum.arduino.cc/index.php?topic=83079.msg2450514

  1. Official 2560
    I removed the FTDI driver from Mac OS 10.11, anduse the stock driver. Uno serial is detected, but official 2560 board is not. I see some other posts in the forum on this, but no clues as to a fix or what to do to debug.

Thanks.