sdk-manual: Added note in step to set SDKMACHINE

The value of SDKMACHINE must match the architecture of the machine
on which the SDK installer is being built if you are building an
installer for an extensible SDK.  I added a note to this effect.

(From yocto-docs rev: ffdd9a9d00cccf270b5aa236279e6eeea0ff47ed)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/documentation/sdk-manual/sdk-appendix-obtain.xml b/documentation/sdk-manual/sdk-appendix-obtain.xml
index 242dff4f76..78203a093c 100644
--- a/documentation/sdk-manual/sdk-appendix-obtain.xml
+++ b/documentation/sdk-manual/sdk-appendix-obtain.xml
@@ -159,6 +159,20 @@
                 <ulink url='&YOCTO_DOCS_REF_URL;#var-SDKMACHINE'><filename>SDKMACHINE</filename></ulink>
                 variable in the <filename>local.conf</filename> file in your
                 Build Directory is correctly set.
+                <note>
+                    If you are building an SDK installer for the Extensible
+                    SDK, the <filename>SDKMACHINE</filename> value must be
+                    set for the architecture of the machine you are using to
+                    build the installer.
+                    If <filename>SDKMACHINE</filename> is not set appropriately,
+                    the build fails and provides an error message similar to
+                    the following:
+                    <literallayout class='monospaced'>
+     The extensible SDK can currently only be built for the same architecture as the machine being built on - SDK_ARCH is
+     set to i686 (likely via setting SDKMACHINE) which is different from the architecture of the build machine (x86_64).
+     Unable to continue.
+                    </literallayout>
+                </note>
                 </para></listitem>
             <listitem><para>
                 <emphasis>Build the SDK Installer:</emphasis>