<p>Haiku's Boot Loader Options 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 if you have installed a software component that acts up and prevents you from booting Haiku, see <ahref="#troubleshooting">Troubleshooting</a> below.</p>
<p>För att få fram valen i Boot Loader måste du tycka på, och fortsätta hålla ner tangenten <spanclass="key">SKIFT</span> innan Haikus startprocess. Om du har en boot manager installerad kan du börja hålla ner <spanclass="key">SKIFT</span> innan du väljer att starta Haiku. Om Haiku är det enda installerade operativsystemet på datorn kan du börja hålla ner tangenten när du fortfarande ser startmeddelanden från BIOS. </p>
<divclass="box-info">With some hardware, you'll have to make sure USB keyboards are enabled in the BIOS.<br/>
On computers that use UEFI for booting instead of the classic BIOS, you need to use the <spanclass="key">SPACEBAR</span> instead of <spanclass="key">SHIFT</span>.</div>
<tr><td><b>Select boot volume</b></td><td></td><td>Choose which Haiku installation/state to start (see <ahref="#troubleshooting">Troubleshooting</a> below).</td></tr>
<tr><td><b>Select safe mode options</b></td><td></td><td>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.</td></tr>
Puts the system into safe mode. This can be enabled independently from the other options.</p>
<p><spanclass="menu">Disable user add-ons</span><br/>
Prevents all user installed add-ons from being loaded. Only the add-ons in the system directory will be used. See <ahref="#troubleshooting">Troubleshooting</a> below.</p>
<p><spanclass="menu">Disable IDE DMA</span><br/>
Disables IDE DMA, increasing IDE compatibility at the expense of performance.</p>
Allows to select system files that shall be ignored. Useful e.g. to disable drivers temporarily. See <ahref="#troubleshooting">Troubleshooting</a> below.</p></td></tr>
<tr><td><b>Select debug options</b></td><td></td><td>Here you'll find several options that help with debugging or getting details for a <ahref="../../welcome/sv_SE/bugreports.html">bug report</a>. Again, a short explanation for each option is displayed at the bottom.</td></tr>
<tr><td></td><td></td><td>If <spanclass="menu">Enable debug syslog</span> is activated, a warm reboot after a crash shows these additional options:</td></tr>
<p>If Haiku refuses to boot on your hardware from the get-go, try out setting different options under <spanclass="menu">Select safe mode options</span>. Consider filing a <ahref="../../welcome/sv_SE/bugreports.html">bug report</a> in any case.</p>
<p>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:</p>
<li><p>Activating <spanclass="menu">Disable user add-ons</span> will prevent using any add-ons (drivers, translators, etc.) you have installed in the user hierarchy under your Home folder.</p></li>
<li><p>If activating <spanclass="menu">Use fail-safe graphics driver</span> solves your troubles by falling back to VESA graphics, you can make the setting permanent by removing the <tt>#</tt> of the line <i>#fail_safe_video_mode true</i> in the text file <spanclass="path">/boot/home/config/settings/kernel/drivers/kernel</span>.</p></li>
<li><p>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 <spanclass="menu">Disable system components</span> 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 <spanclass="key">SPACE</span> or <spanclass="key">RETURN</span> key. <spanclass="key">ESC</span> returns you up one level to the parent directory.</p>
<p>Online, there's the guide <ahref="https://www.haiku-os.org/guides/daily-tasks/blacklist-packages">Disabling components of packages</a> showing how to make that setting stick.</p></li>
<li><p>Under <spanclass="menu">Select boot volume</span> 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.<br/>
So, if you encounter boot problems after installing some package, boot a Haiku state from before that time and uninstall the offending package.</p></li>
