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Dustin C. Hatch 4ec3117b3c cmdline: enable serial console

While developing, it will be nice to have the serial console available
for troubleshooting, especially for issues that prevent network/SSH from
working correctly.  I've temporarily connected a USB-TTL console cable
to *serial0* to control the serial console of the HUD machine.

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overlay

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.gitignore

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cmdline.txt

cmdline: enable serial console

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config.txt

config: disable HDMI overscan

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Makefile

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mkinitramfs.sh

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mkrootfs.sh

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prepare.sh

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publish.sh

publish: Upload rootfs image atomically

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README.md

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squashfs-exclude.txt

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README.md

Basement Hud Network-Booted OS

Customized Fedora-based operating system distributed as an immutable root filesystem image.

Building

Must run on a Fedora host or privileged container.

Build the root filesystem image:

make rootfs

This will create an _build/rootfs directory containing the root filesystem hierarchy. The _build/rootfs/boot directory contains the necessary files to boot the system:

efi: This directory contains the Raspberry Pi firmware files
initramfs.img: Early userspace image
vmlinuz: Kernel image
basementhud.squashfs: Root filesystem image

The Raspberry Pi firmware, initramfs image, and kernel image files must be served by a TFTP, while the rootfs image is served by NBD.

Build the initramfs image:

make initramfs