As indicated here: https://social.treehouse.systems/@AsahiLinux/112449204541186432
The system firmware that comes with macOS Sonoma 14.5 triggers a bug in the m1n1 bootloader that is used to boot OpenBSD on these machines. The bug will prevent OpenBSD from booting on some machines after the macOS update has been installed. The recommended fix is to update the "stage1" m1n1 by booting into macOS and running: $ curl https://alx.sh | sh choosing the 'm' option when prompted to upgrade as indicated in the aforementioned post. This should work even if you've already installed the macOS update. We've also released a new version of the "apple-boot" firmware (which contains a "stage2" m1n1) that has a workaround for the bug. To install this new firmware on OpenBSD 7.5 or -current, you can do: # fw_update # installboot sd0 This must be done before updating macOS. You can verify that the workaround is installed with the following command: # eeprom -p | grep m1n1 asahi,m1n1-stage2-version: '1.4.14' If the displayed version number is 1.4.14 or later, the workaround is installed. OpenBSD 7.4 users should upgrade to OpenBSD 7.5. Cheers, Mark
