APM 2.5 fails to boot unless some sort of telemetry is attached.

[GoogleCodeExporter]

This is tested with APM2.5 and arduplane 2.40, 2.60, 2.61 2.62. 2.63.

If APM 2.5 is connected to USB, it boots, you see the red/blue leds flash 
during gyro calibration - thinks are "normal".

When I power APM 2.5 differently than USB, (normal boot) - it will *only* boot 
if something is connected to the telemetry port (the small 6-pin connector in 
upper left corner.)  Unless the APM's telemetry RX pin gets connected to for 
example MinimOSD or 3DR Radio, the APM 2.5 will fail to boot, never forwarding 
any servo output, and not getting as far as flashing red/blue during gyro 
calibration.

I tried this with really many firmware versions, and several erase/factory 
resets it's 100% reproducible.

Original issue reported on code.google.com by andre.kj...@gmail.com on 18 Sep 2012 at 4:17

[GoogleCodeExporter]

I just tried another 2.5 - same firmware/config. and this is NOT a problem.
So this may indicate some kind of bizzare hardware malfunction.
Feel free to suggest what could cause something like this..

Original comment by andre.kj...@gmail.com on 18 Sep 2012 at 7:18

[GoogleCodeExporter]

I've got the same problem. It's also compensating for the Yaw in the wrong 
direction.

Original comment by taylor.l...@gmail.com on 23 Sep 2012 at 2:43

[GoogleCodeExporter]

regarding YAW - you should just reverse that channel in APM.

Original comment by andre.kj...@gmail.com on 23 Sep 2012 at 7:23