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<!-- retain these comments for translator revision tracking -->
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<!-- $Id: sparc.xml,v 1.5 2003/06/15 17:39:03 toff Exp $ -->
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<sect2 id="invoking-openboot"><title>Invoking OpenBoot</title>
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<para>
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OpenBoot provides the basic functions needed to boot the &arch-title;
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architecture. This is rather similar in function to the BIOS in the
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x86 architecture, although much nicer. The Sun boot PROMs have a
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built-in forth interpreter which lets you do quite a number of things
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with your machine, such as diagnostics, simple scripts, etc.
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</para><para>
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To get to the boot prompt you need to hold down the
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<emphasis>Stop</emphasis> key (on older type 4 keyboards, use the
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<emphasis>L1</emphasis> key, if you have a PC keyboard adapter, use
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the <emphasis>Break</emphasis> key) and press the
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<emphasis>A</emphasis> key. The boot PROM will give you a prompt,
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either <userinput>ok</userinput> or <userinput>></userinput>. It is
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preferred to have the <userinput>ok</userinput> prompt. So if you get
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the old style prompt, hit the `n' key to get the new style prompt.
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</para>
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</sect2>
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<sect2 id="boot-dev-select-sun"><title>Boot Device Selection</title>
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<para>
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You can use OpenBoot to boot from specific devices, and also to change
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your default boot device. However, you need to know some details
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about how OpenBoot names devices; it's much different from Linux
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device naming, described in <xref linkend="device-names"></xref>.
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Also, the command will vary a bit, depending on what version of
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OpenBoot you have. More information about OpenBoot can be found in
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the <ulink url="&url-openboot;">Sun OpenBoot Reference</ulink>.
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</para><para>
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Typically, with newer revisions, you can use OpenBoot device such as
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``floppy'', ``cdrom'', ``net'', ``disk'', or ``disk2''. These have
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the obvious meanings; the ``net'' device is for booting from the
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network. Additionally, the device name can specify a particular
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partition of a disk, such as ``disk2:a'' to boot disk2, first
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partition. Full OpenBoot device names have the form
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<informalexample>
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<screen>
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<replaceable>driver-name</replaceable>@
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<replaceable>unit-address</replaceable>:
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<replaceable>device-arguments</replaceable>
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</screen></informalexample>.
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In older revisions of OpenBoot, device naming is a bit different: the
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floppy device is called ``/fd'', and SCSI disk devices are of the form
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``sd(<replaceable>controller</replaceable>,
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<replaceable>disk-target-id</replaceable>,
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<replaceable>disk-lun</replaceable>)''. The command
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<userinput>show-devs</userinput> in newer OpenBoot revisions is useful
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for viewing the currently configured devices. For full information,
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whatever your revision, see the
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<ulink url="&url-openboot;">Sun OpenBoot Reference</ulink>.
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</para><para>
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To boot from a specific device, use the command <userinput>boot
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<replaceable>device</replaceable></userinput>. You can set this
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behavior as the default using the <userinput>setenv</userinput>
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command. However, the name of the variable to set changed between
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OpenBoot revisions. In OpenBoot 1.x, use the command
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<userinput>setenv boot-from
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<replaceable>device</replaceable></userinput>. In later revisions of
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OpenBoot, use the command <userinput>setenv boot-device
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<replaceable>device</replaceable></userinput>. Note, this is also
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configurable using the <command>eeprom</command> command on Solaris,
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or modifying the appropriate files in
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<filename>/proc/openprom/options/</filename>, for example under Linux:
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<informalexample><screen>
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echo disk1:1 >/proc/openprom/options/boot-device
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</screen></informalexample>
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and under Solaris:
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<informalexample><screen>
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eeprom boot-device=disk1:1
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</screen></informalexample>
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</para>
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</sect2>
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