Dustin C. Hatch
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At this point, we can generate an SD card image that is composed of an EFI system partition, a SquashFS root partition (a), a blank root partition (b), and a data partition. On the EFI system partition are the Raspberry Pi firmware and device trees, U-Boot and GRUB. The SquashFS filesystem contains the kernel and the whole filesystem tree. A Raspberry Pi can successfully boot from an SD card containing this image. It's not quite usable yet, because there's no writable storage available, or indeed any way to log in.