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charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.27 X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.27 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jul 2018 15:01:08 -0000 Can you disconnect the serial TX data (data to the RPi) and try the reboots= ? It may be that this signal is partially powering the processor through the = input ESD protection diode, leading to very awkward internal states. This h= as been observed on the Rock64 (RK3328 SoC) and Rockpro64 (RK3399). If you can just break the TX connection, you'll be able to see the boot mes= sages. -wis Wis Macomson, Signal Integrity Engineer Oregon, Teraspeed Home Office Office: 541-393-8023=20 www.samtec.com =20