PX4/Firmware — pull request #1163 by hxxnrx (2014-07-10 19:54:44+00:00)
Title: Set IO PX4_I2C_BUS_ONBOARD I2C speed to 400KHz

The PX4_I2C_BUS_ONBOARD I2C speed is set to 320KHz. But the other bus members like MS5611 and HMC5883 running at 400KHz.