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-rw-r--r--documentation/ref-manual/ref-variables.xml11
1 files changed, 11 insertions, 0 deletions
diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 973a761b95..c7f1122fd4 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -6073,6 +6073,17 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
<link linkend='var-IMAGE_FSTYPES'><filename>IMAGE_FSTYPES</filename></link>
variable.
</para>
+
+ <para>
+ The default value of this variable, which is set in the
+ <filename>meta/conf/bitbake.conf</filename> configuration
+ file in the
+ <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>,
+ is "cpio.gz".
+ The Linux kernel's initramfs mechanism, as opposed to the
+ initrd mechanism, expects an optionally compressed cpio
+ archive.
+ </para>
</glossdef>
</glossentry>