NanoPi R4S — On booting mainline Linux, fixing SD-card support, and a Heisenbug that sucked me into a rabbit hole

This little ARM64 single-board computer dragged me into the world of device trees, voltage regulators, and one of the worst Heisenbugs I encountered so far.

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Louis Rossmann , Robin Murphy , Broadcom , Gigabit Ethernet , Admiral Grace Hopper ,