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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-25 19:59:05 -0400
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-<table class="head">
- <tr>
- <td class="head-ltitle">BOOT(8)</td>
- <td class="head-vol">System Manager's Manual (sun2)</td>
- <td class="head-rtitle">BOOT(8)</td>
- </tr>
-</table>
-<div class="manual-text">
-<section class="Sh">
-<h1 class="Sh" id="NAME"><a class="permalink" href="#NAME">NAME</a></h1>
-<p class="Pp"><code class="Nm">boot</code> &#x2014; <span class="Nd">system
- bootstrapping procedures</span></p>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SYNOPSIS"><a class="permalink" href="#SYNOPSIS">SYNOPSIS</a></h1>
-<table class="Nm">
- <tr>
- <td><code class="Nm">b</code></td>
- <td>[<var class="Ar">dev</var> [(<var class="Ar">cntrl</var>,
- <var class="Ar">unit</var>, <var class="Ar">part</var>)]]
- [<var class="Ar">file</var>] [<code class="Fl">-adqsv</code>]</td>
- </tr>
-</table>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="DESCRIPTION"><a class="permalink" href="#DESCRIPTION">DESCRIPTION</a></h1>
-<section class="Ss">
-<h2 class="Ss" id="Power_fail_and_crash_recovery"><a class="permalink" href="#Power_fail_and_crash_recovery">Power
- fail and crash recovery</a></h2>
-<p class="Pp">Normally, the system will reboot itself at power-up or after
- crashes. An automatic consistency check of the file systems will be
- performed as described in <a class="Xr">fsck(8)</a>, and unless this fails,
- the system will resume multi-user operations.</p>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="Selecting_the_device_and_kernel_to_boot"><a class="permalink" href="#Selecting_the_device_and_kernel_to_boot">Selecting
- the device and kernel to boot</a></h2>
-<p class="Pp">Normally, the <code class="Nm">b</code> command alone is
- sufficient to boot the system, as the PROM chooses a default boot device
- <var class="Ar">dev</var> if none is specified. The PROM chooses the first
- device present on the system from the following ordered list:</p>
-<p class="Pp"></p>
-<div class="Bd Bd-indent">
-<pre>sd SCSI disk
-ie Intel Ethernet
-ec 3Com Ethernet</pre>
-</div>
-<p class="Pp">Unless specified, the controller number
- <var class="Ar">cntrl</var>, unit number <var class="Ar">unit</var>, and
- partition number <var class="Ar">part</var> default to zero, which is almost
- always correct.</p>
-<p class="Pp">The controller number can be specified if there is more than one
- of the given device in the system. For example, use &#x201C;ie(1,,)&#x201D;
- to boot off of the second Intel Ethernet in the system.</p>
-<p class="Pp">The unit number specifies one of the many devices attached to a
- controller. The exact meaning and values vary depending on the device name.
- For example, &#x201C;sd(,18,)&#x201D; boots the disk at target 6 on the
- first SCSI controller, 18 being the target number 6, multiplied by 4, and
- given in hexadecimal.</p>
-<p class="Pp">The partition number specifies one of the many partitions on a
- device. The exact meaning and values vary depending on the device name. For
- example, &#x201C;sd(,18,1)&#x201D; boots the second partition on the disk at
- target 6 on the first SCSI controller.</p>
-<p class="Pp">The PROM only loads a first-stage boot program, currently either
- <span class="Pa">/usr/mdec/bootxx</span> (for a disk boot), or
- <span class="Pa">/usr/mdec/bootyy</span> (for a network boot). This
- first-stage boot program then loads the second-stage boot program from the
- same device, currently either <span class="Pa">/usr/mdec/ufsboot</span> (for
- a disk boot), or <span class="Pa">/usr/mdec/netboot</span> (for a network
- boot).</p>
-<p class="Pp">The second-stage boot program will then attempt to load the kernel
- named <var class="Ar">file</var> (or <span class="Pa">vmunix</span> if none
- is specified). The second-stage disk boot program
- <span class="Pa">/usr/mdec/ufsboot</span> loads the kernel from the same
- device that it was loaded from, while the second-stage network boot program
- <span class="Pa">/usr/mdec/netboot</span> will load the kernel from the NFS
- root as determined by the procedure described in
- <a class="Xr">diskless(8)</a>.</p>
-</section>
-<section class="Ss">
-<h2 class="Ss" id="Boot_program_options"><a class="permalink" href="#Boot_program_options">Boot
- program options</a></h2>
-<dl class="Bl-tag">
- <dt id="a"><a class="permalink" href="#a"><code class="Fl">-a</code></a></dt>
- <dd>Prompt for the root file system device, the system crash dump device, and
- the path to <a class="Xr">init(8)</a>.</dd>
- <dt id="d"><a class="permalink" href="#d"><code class="Fl">-d</code></a></dt>
- <dd>Bring the system up in debug mode. Here it waits for a kernel debugger
- connect; see <a class="Xr">ddb(4)</a>.</dd>
- <dt id="q"><a class="permalink" href="#q"><code class="Fl">-q</code></a></dt>
- <dd>Boot the system in quiet mode.</dd>
- <dt id="s"><a class="permalink" href="#s"><code class="Fl">-s</code></a></dt>
- <dd>Bring the system up in single-user mode.</dd>
- <dt id="v"><a class="permalink" href="#v"><code class="Fl">-v</code></a></dt>
- <dd>Boot the system in verbose mode.</dd>
-</dl>
-<p class="Pp">Other flags are currently ignored.</p>
-<p class="Pp">At any time you can break back to the ROM by pressing the
- &#x2018;L1&#x2019; and &#x2018;a&#x2019; keys at the same time (if the
- console is a serial port the same is achieved by sending a
- &#x2018;break&#x2019;). If you do this accidentally you can continue
- whatever was in progress by typing &#x2018;c&#x2019; followed by the return
- key.</p>
-</section>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="FILES"><a class="permalink" href="#FILES">FILES</a></h1>
-<dl class="Bl-tag Bl-compact">
- <dt><span class="Pa">/netbsd</span></dt>
- <dd>system code</dd>
- <dt><span class="Pa">/usr/mdec/bootxx</span></dt>
- <dd>first-level boot block for disks</dd>
- <dt><span class="Pa">/usr/mdec/bootyy</span></dt>
- <dd>first-level boot block for NFS (diskless) boot</dd>
- <dt><span class="Pa">/usr/mdec/netboot</span></dt>
- <dd>boot program for NFS (diskless) boot</dd>
- <dt><span class="Pa">/usr/mdec/ufsboot</span></dt>
- <dd>second-level boot program for UFS disks</dd>
- <dt><span class="Pa">/usr/sbin/installboot</span></dt>
- <dd>program to install bootxx on a disk</dd>
-</dl>
-</section>
-<section class="Sh">
-<h1 class="Sh" id="SEE_ALSO"><a class="permalink" href="#SEE_ALSO">SEE
- ALSO</a></h1>
-<p class="Pp"><a class="Xr">crash(8)</a>, <a class="Xr">disklabel(8)</a>,
- <a class="Xr">fsck(8)</a>, <a class="Xr">halt(8)</a>,
- <a class="Xr">init(8)</a>, <a class="Xr">rc(8)</a>,
- <a class="Xr">shutdown(8)</a>, <a class="Xr">syslogd(8)</a></p>
-</section>
-</div>
-<table class="foot">
- <tr>
- <td class="foot-date">April 29, 2003</td>
- <td class="foot-os">NetBSD 10.1</td>
- </tr>
-</table>