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The defualt in NuttX is OSPEED of 50Mhz. This is realy a slew rate control. At the default high slew rate the overshoot was .7 Volts. On a ICM20649 this was causing the device to output garbage. All 0s N.B. A passive scope or Logic analyser's probes load will mask the failure. Useed a FET probe to verify the issue.