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-rw-r--r--documentation/ref-manual/ref-variables.xml34
1 files changed, 34 insertions, 0 deletions
diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 258ae2c6db..03d2034dba 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -1609,6 +1609,40 @@
1609 </glossdef> 1609 </glossdef>
1610 </glossentry> 1610 </glossentry>
1611 1611
1612 <glossentry id='var-DISK_SIGNATURE'><glossterm>DISK_SIGNATURE</glossterm>
1613 <glossdef>
1614 <para>
1615 Automatically generated random signature that allows the
1616 OpenEmbedded build system to create a boot
1617 loader configuration.
1618 <filename>DISK_SIGNATURE</filename> is different each time
1619 a <filename>directdisk</filename> image is built.
1620 <note>
1621 The "live" option used with
1622 <link linkend='var-IMAGE_FSTYPES'><filename>IMAGE_FSTYPES</filename></link>
1623 produces an image file that can be copied directly to
1624 a CD or USB device and run as is.
1625 </note>
1626 The auto-generated <filename>DISK_SIGNATURE</filename> sets
1627 <filename>SYSLINUX_ROOT</filename> as follows:
1628 <literallayout class='monospaced'>
1629 SYSLINUX_ROOT = "root=PARTUUID=${DISK_SIGNATURE}-02"
1630 </literallayout>
1631 </para>
1632
1633 <para>
1634 It is possible to set the
1635 <filename>DISK_SIGNATURE</filename> variable in your
1636 <filename>local.conf</filename> file to a fixed
1637 value if you do not want <filename>syslinux.cfg</filename>
1638 changing for each build.
1639 You might find this useful when you want to upgrade the
1640 root filesystem on a device without having to recreate or
1641 modify the master boot record.
1642 </para>
1643 </glossdef>
1644 </glossentry>
1645
1612 <glossentry id='var-DISTRO'><glossterm>DISTRO</glossterm> 1646 <glossentry id='var-DISTRO'><glossterm>DISTRO</glossterm>
1613 <glossdef> 1647 <glossdef>
1614 <para> 1648 <para>