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Added RPI4 install instructions

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Pieter Lenaerts 2023-03-12 18:39:30 +01:00
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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:
- <https://github.com/raspberrypi/linux/issues/3210#issuecomment-716510916>
contains the hint to not use 32-bit.
- <https://forums.raspberrypi.com/viewtopic.php?t=249924>
- <https://forums.raspberrypi.com/viewtopic.php?t=67204>