Boot a Radxa ROCK 3A entirely from an SSD on a PCIe SATA HAT (no microSD) - fixes the U-Boot/Linux PCIe warm-handoff with a Secondary Bus Reset from the initramfs. Plus two techniques for debugging a headless SBC with no serial console

ROCK 3 Series 3A
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Boot a Radxa ROCK 3A entirely from an SSD on a PCIe SATA HAT (no microSD) - fixes the U-Boot/Linux PCIe warm-handoff with a Secondary Bus Reset from the initramfs. Plus two techniques for debugging a headless SBC with no serial console.