Arranque

MIKE OS — Boot Process and Initialization

1. Boot Stages

BIOS / UEFI
    │
    ▼
Linux Kernel (bzImage)
    │
    ▼
/init (Universal PID 1 Entrypoint)
    │
    ├── Mode Recovery (mikeos_recovery=1) -> Emergency Shell
    │
    ├── Persistent Disk Mode (root=/dev/vda)
    │     └── Mount ext4 root -> switch_root -> /sbin/runit
    │
    └── In-Memory Mode (initramfs)
          └── Direct execution -> /sbin/runit

2. Kernel Parameters Supported

  • root=/dev/vda rw: Selects persistent root block device.
  • console=ttyS0 or console=tty0: Configures primary system console.
  • mikeos_recovery=1: Boots directly into emergency root shell.
  • mikeos_benchmark=1: Runs telemetry benchmark and halts.
  • mikeos_test_suite=1: Executes the 21-check automated test suite.

3. Runit Stage Flow

  1. Stage 1 (/etc/runit/1): Mounts virtual filesystems (/proc, /sys, /dev, /dev/pts, /run, /tmp), brings up loopback, sets hostname from /etc/mikeos/system.conf, and displays the welcome banner.
  2. Stage 2 (/etc/runit/2): Starts runsvdir supervising /var/service.
  3. Stage 3 (/etc/runit/3): Gracefully shuts down all services, syncs storage, unmounts filesystems, and halts/reboots.