OpenBSD 7.9 install on Mac Mini M2 cannot see USB storage

An OpenBSD 7.9 install on a failed before the could start. The alx.sh setup completed, and the machine reached U-Boot. When booting with a USB stick inserted, U-Boot reported that it found 0 USB storage devices.

The boot then stopped with the error “Boot failed (err=-14).” The same result happened with two different USB sticks. The keyboard also did not work inside U-Boot, making it hard to control the boot process.

Key points

  • OpenBSD 7.9 did not start installing on a .
  • The alx.sh setup completed and the system reached U-Boot.
  • U-Boot found 0 USB storage devices even with a USB stick inserted.
  • Two different USB sticks produced the same failure.
  • The keyboard did not work inside U-Boot.
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