OpenBSD/arm64 is a port of OpenBSD to various 64-bit ARM based systems.
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The current target platforms are Allwinner A64/H5, Amlogic G12B/SM1, AMD Opteron A1100, Ampere eMAG, Marvell ARMADA 7K/8K, Rockchip RK3328/RK3399, Broadcom BCM2837/BCM2711 (Raspberry Pi 3/4) and Socionext SCA11.
The install media includes firmware required to boot the Pine 64/64+ and Raspberry Pi 3.
The Raspberry Pi 3 requires closed but redistributable files on the system disk to load into the VC4 GPU which starts the ARM cores. By default the boot ROM will only try to load these files off an SD card. To load the firmware off the SD card and have the root disk on USB after installing OpenBSD reboot and interrupt U-Boot before the timeout expires and instruct U-Boot to prefer USB over the SD card:
Hit any key to stop autoboot: 0 U-Boot> setenv boot_targets usb0 mmc0 pxe dhcp U-Boot> saveenv U-Boot> boot
The Raspberry Pi 4 is only supported when using EDK2-based UEFI firmware. By default the boot ROM will only try to load the firmware off an SD card. No manual steps needed to boot from a USB disk drive as the UEFI prefers booting from USB over booting from SD card.
Ampere eMAG and AMD Opteron systems come with a UEFI firmware in ROM and can boot off SATA or USB devices without board specific boot files on the system disk.
Most other machines load their firmware from the boot media and require additional steps to create bootable install media. See the OpenBSD/arm64 snapshot installation instructions for further details.
OpenBSD/arm64 runs on the following hardware:
In general, other boards/machines that use one of the SoCs listed above will work as well, as long as UEFI firmware (e.g. U-Boot or EDK II firmware) is available. Both device trees and ACPI are supported. An updated device tree may have to be supplied to make OpenBSD usable.
Note that the Raspberry Pi 3 model B+ is not the same as the original Raspberry Pi 3; some important devices on the B+ are not supported.
The latest supported OpenBSD/arm64 release is OpenBSD 6.8. Here are the OpenBSD/arm64 installation instructions.
Snapshots are made available from time to time, in this location as well as on a few mirrors. Here are the OpenBSD/arm64 snapshot installation instructions as well.