ref-manual: INITRD var: make it a list of filesystem images.

The initrd image used by the Linux kernel is list of file
system images concatenated together and presented as a single
initrd file at boot time.

So far the initrd is a single filesystem image. But in cases
like to support early microcode loading, the initrd image need
to have multiple filesystem images concatenated together.

This commit is extending the INITRD variable from a single
filesystem image to a list of filesystem images to satisfy
the need mentioned above.

(From yocto-docs rev: 051ef2e4d6480b28d21a59a79b6f0dca1a5944bd)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 6 insertions, 5 deletions

diff --git a/documentation/ref-manual/ref-classes.xml b/documentation/ref-manual/ref-classes.xml
index e7e9942b3b..a96ccfd652 100644
--- a/documentation/ref-manual/ref-classes.xml
+++ b/documentation/ref-manual/ref-classes.xml
@@ -881,7 +881,8 @@
         <itemizedlist>
             <listitem><para>
                 <link linkend='var-INITRD'><filename>INITRD</filename></link>:
-                Indicates a filesystem image to use as an initrd (optional).
+                Indicates list of filesystem images to concatenate and use
+                as an initial RAM disk (initrd) (optional).
                 </para></listitem>
             <listitem><para>
                 <link linkend='var-ROOTFS'><filename>ROOTFS</filename></link>:
@@ -2864,8 +2865,8 @@
         The class supports the following variables:
         <itemizedlist>
             <listitem><para><emphasis><link linkend='var-INITRD'><filename>INITRD</filename></link>:</emphasis>
-                Indicates a filesystem image to use as an initial RAM disk
-                (initrd).
+                Indicates list of filesystem images to concatenate and use as
+                an initial RAM disk (initrd).
                 This variable is optional.</para></listitem>
             <listitem><para><emphasis><link linkend='var-ROOTFS'><filename>ROOTFS</filename></link>:</emphasis>
                 Indicates a filesystem image to include as the root filesystem.
diff --git a/documentation/ref-manual/ref-variables.xml b/documentation/ref-manual/ref-variables.xml
index 034eebe0e1..7ea753df71 100644
--- a/documentation/ref-manual/ref-variables.xml
+++ b/documentation/ref-manual/ref-variables.xml
@@ -4020,8 +4020,8 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
         <glossentry id='var-INITRD'><glossterm>INITRD</glossterm>
             <glossdef>
                 <para>
-                    Indicates a filesystem image to use as an initial RAM
-                    disk (<filename>initrd</filename>).
+                    Indicates list of filesystem images to concatenate and use
+                    as an initial RAM disk (<filename>initrd</filename>).
                 </para>
 
                 <para>