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ブートローダー

Haiku のブートローダーオプションは、ハードウェア周りに関連した問題に悩んだ場合や、Haiku を複数インストールしていて (おそらくインストール CD 上あるいは USB メモリ上の Haiku)、そのいずれかを選択する場合に役立ちます。また、あるソフトウェアコンポーネントをインストールしたもののそれが正しく動作せず、システムの起動を妨げてしまう場合にもそれは役立ちます。以下のトラブルシューティングを見てください。

ブートローダーオプションに入るには、Haiku の起動プロセスが始まる前に SHIFT キーを押し続ける必要があります。ブートマネージャーがインストールされているなら、Haiku のブートエントリーを実行する前に SHIFT を押し続ける動作を始めても構いません。Haiku がそのマシンの唯一のオペレーティングシステムであれば、BIOS からのブートメッセージがまだ表示されている状態から SHIFT キーを押し続ける動作を始められます。

ブートローダーオプション

ブートローダーオプションに入ると、次の 4 つのメニューが表示されます。

Select boot volume		Haiku のインストール済イメージまたはバージョンのうち、どれを起動するのか選択します(以下のトラブルシューティングを参照ください)。
Select safe mode options		ハードウェア周りに問題が生じた場合、または不正なアドオンのためにシステムが不安定あるいは起動しなくなった場合に試してみるべきオプションがいくつかあります。オプションに選択バーを移動させると、画面の下部に短い説明が表示されます。
		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 graphics driver 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 screen resolution		Lets you force a certain screen 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 so you can uninstall the offending package:

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.
Under Select boot volume you can specify what former "version" of Haiku to boot. Every time you un/install a package, the old state is saved and you can boot into it by choosing it from the list presented in the boot loader options.
So, if you encounter boot problems after installing some package, boot a Haiku state from before that time and uninstall the offending package.

Booting 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.
Disk + magnifier		Creating rootfs (/) and mounting devfs (/dev).
Plug-in card		Initializing device manager.
Boot disk		Mounting boot disk.
Chip		Loading CPU specific modules.
Folder		Final initialization of subsystems.
Rocket		Launch_daemon has started the system.