pokemon_pinball_wiki/boot-and-init.md

Boot and Init

Init System

The rootfs uses BusyBox init via /etc/inittab. There is no systemd unit layout in this extraction.

Important /etc/inittab behavior:

1. Mounts proc at /proc.
2. Creates /dev/pts and /dev/shm.
3. Runs mount -a.
4. Creates /run/lock/subsys.
5. Runs swapon -a.
6. Links /dev/fd, /dev/stdin, /dev/stdout, and /dev/stderr into proc fd paths.
7. Sets hostname from /etc/hostname.
8. Runs /etc/init.d/rcS.
9. On shutdown, runs /etc/init.d/rcK, then swapoff -a, then umount -a -r.

Console gettys are present but commented out:

• Serial console: console::respawn:/sbin/getty -L console 0 vt100
• HDMI console: tty1::respawn:/sbin/getty -L tty1 0 vt100

That means the extracted configuration does not spawn an interactive login shell by default.

rcS Startup Order

/etc/init.d/rcS runs all /etc/init.d/S??* files in lexical order. For this rootfs:

Order	Script	Purpose
01	S01seedrng	Seed RNG support. Comment references /data/seedrng.
01	S01syslogd	Starts syslog daemon.
02	S02klogd	Starts kernel log daemon.
02	S02sysctl	Applies sysctl settings.
10	S10udev	Starts udev.
12	S12lvds_panel	Starts boot display on the LVDS panel.
30	S30dbus	Starts D-Bus.
40	S40bluetoothd	Starts Bluetooth daemon.
40	S40network	Runs /sbin/ifup -a.
50	S50crond	Starts cron daemon. No cron job files were present under /etc/cron* in this extraction.
55	S55spike3	Spike-specific Bluetooth, audio, and module setup.
95	S95game	Kernel update check, persistent directory setup, core dump policy, monitors, game launch, update scanner.

Shutdown Order

/etc/init.d/rcK reverses the /etc/init.d/S??* list and calls each script with stop.

Spike-specific Boot Actions

S12lvds_panel:

• Sources /etc/init.d/shared.
• Starts $BOOT_DISPLAY in the background.
• $BOOT_DISPLAY resolves first to /games/spike3/bin/boot_display, falling back to /usr/local/spike/boot_display.

S55spike3:

• Runs bluetoothctl power on.
• Registers a KeyboardOnly Bluetooth agent and makes it the default agent.
• Starts BlueALSA as A2DP source: /usr/bin/bluealsa -p a2dp-source &.
• Loads i2c-dev, exfat, and fuse.

S95game:

• Checks staged kernel update files under /connectivity/os_update.
• Runs a previous /connectivity/os_update/post_install_hook.sh if present.
• Creates persistent ALSA/Bluetooth directories under /connectivity.
• Ensures /var/lib/alsa, /var/lib/bluetooth, and /var/lib/bluealsa point into /connectivity.
• Overrides hostname from /connectivity/hostname if present.
• Prepares /connectivity/dump/cores.
• Sets ulimit -c unlimited.
• Sets core pattern to /connectivity/dump/cores/core.%h.%t.
• Starts reboot_monitor, conagent_monitor, and game_monitor if /games/game exists.
• Starts /etc/init.d/update in the background so USB/downloaded .spk updates can interrupt the running game.