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Boot Loader

Haiku's Boot Loader can help when you experience hardware related problems or want to choose which Haiku installation to start, if you have more than one (maybe on an installation CD or USB stick).
It's also handy after you installed a software component that acts up and prevents you from booting the system to remove it again. The Disable user add-ons option that's mentioned below, will start Haiku without loading user installed components, e.g. a driver.

To enter the Boot Loader options, you have to press and keep holding the SHIFT key before the beginning of Haiku's boot process. If there's a boot manager installed, you can start holding SHIFT before invoking the boot entry for Haiku. If Haiku is the only operating system on the machine, you can begin holding the key while still seeing boot messages from the BIOS.

Boot Loader Options

Once it's there, you're offered four menus:

Select boot volume		Choose which Haiku installation to start.
Select safe mode options		There are several options to try in case of hardware related trouble or if the system becomes unstable or unbootable because of a misbehaving add-on. When moving the selection bar to an option, a short explanation appears at the bottom of the screen.
		Safe mode Puts the system into safe mode. This can be enabled independently from the other options. Disable user add-ons Prevents all user installed add-ons from being loaded. Only the add-ons in the system directory will be used. See Troubleshooting below. Disable IDE DMA Disables IDE DMA, increasing IDE compatibility at the expense of performance. Ignore memory beyond 4 GiB Ignores all memory beyond the 4 GiB address limit, overriding the setting in the kernel settings file. Use fail-safe video mode The system will use VESA mode and won't try to use any video graphics drivers. Disable IO-APIC Disables using the IO APIC for interrupt routing, forcing the use of the legacy PIC instead. Disable local APIC Disables using the local APIC, also disables SMP. Disable SMP Disables all but one CPU core. Don't call the BIOS Stops the system from calling BIOS functions. Disable APM Disables Advanced Power Management hardware support, overriding the APM setting in the kernel settings file. Disable ACPI Disables Advanced Configuration and Power Interface hardware support, overriding the ACPI setting in the kernel settings file. Blacklist entries Allows to select system files that shall be ignored. Useful e.g. to disable drivers temporarily. See Troubleshooting below.
Select debug options		Here you'll find several options that help with debugging or getting details for a bug report. Again, a short explanation for each option is displayed at the bottom.
		Enable serial debug output Turns on forwarding the syslog output to the serial interface (default: 115200, 8N1). Enable on screen debug output Display debug output on screen while the system is booting, instead of the normal boot logo. Disable on screen paging Disables paging when on screen debug output is enabled. Enable debug syslog Enables a special in-memory syslog buffer for this session that the boot loader will be able to access after rebooting. Display current boot loader log Displays the debug info the boot loader has logged (press Q to exit the log) Add advanced debug option Allows advanced debugging options to be entered directly.
		If "Enable debug syslog" is activated, a warm reboot after a crash shows these additional options:
		Save syslog from previous session during boot Saves the syslog from the previous Haiku session to /var/log/previous_syslog when booting. Display syslog from previous session Displays the syslog from the previous Haiku session Save syslog from previous session Saves the syslog from the previous Haiku session to disk. Currently only FAT32 volumes are supported.
Select fail safe video mode		If you had to activate the option Use fail-safe video mode, you can set resolution and color depth.

Troubleshooting

If Haiku refuses to boot on your hardware from the get-go, try out setting different options under Select safe mode options. Consider filing a bug report in any case.

On the other hand, if Haiku only suddenly acts up after you have installed some software, especially hardware drivers, you have several options to get Haiku bootable again to make things right by uninstalling the offending package again:

Activating Safe mode will prevent most servers, daemons and the UserBootScript from being started.
Activating Disable user add-ons will prevent using any add-ons (drivers, translators, etc.) you have installed in the user hierarchy under your Home folder.
If the offending driver, add-on etc. is installed in the system hierarchy, things get a bit more complicated, because that area is read-only. Here, the Blacklist entries comes into play. With it, you can navigate through the whole system hierarchy and disable the component that's messing things up for you by checking an entry with the SPACE or RETURN key. ESC returns you up one level to the parent directory.

Online, there's the article How to Permanently Blacklist a Package File showing how to make that setting stick.

Rozruch Haiku

After activating one or more options, you return to the main menu and continue booting, which presents you with this boot screen:

If everything works OK, one symbol after another quickly lights up.
The different symbols roughly correspond to these boot stages:

Atom		Initializing modules.
Dysk + lupa		Creating rootfs (/) and mounting devfs (/dev).
Karta rozszerzeń		Initializing device manager.
Dysk rozruchowy		Mounting boot disk.
Mikroprocesor		Loading CPU specific modules.
Katalog		Final initialization of subsystems.
Rakieta		Boot script starting the system.