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Raspberry_Pi_4.md

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Kernel

Follow the install instructions at the bottom of https://archlinuxarm.org/platforms/armv8/broadcom/raspberry-pi-4#installation and boot.

Install linux-rpi as kernel and verify /boot/cmdline.txt to point to the right root device before rebooting.

Boot from USB drive

The RPI4 supports booting from USB out of the box.

Refer to https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#usb-boot-modes

Most documentation assumes booting from mmcblk devices. Make sure you always point to the right devices or partitions, particularly in /boot/cmdline.txt and /etc/fstab.

Prefer AArch64 for high IO loads and out-of-memory issues

The RPI4 has issues with a high IO load when running in 32-bit mode. Running AArch64 solves these. If you experience the oom-killer kicking in with no obvious memory hungry apps but high IO, then switch to AArch64.

Sources: