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kernel-dev: Added KMACHINE and MACHINE descriptions for using metadata

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Needed to remove an old example that was showing how two BSPs could
share the same KMACHINE value.  I replaced it with corei7-based
machines.  Also noted that KMACHINE is for kernel mapping only
whereas MACHINE is for the layer's BSP machine type.

(From yocto-docs rev: c1dad2815b6fd1ed78e0dce0fecb422f342eaf14)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2017-10-05 07:13:55 -07:00
committed by Richard Purdie
parent 39c520e77b
commit 6ca1a37dfb
1 changed files with 10 additions and 6 deletions
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16
documentation/kernel-dev/kernel-dev-advanced.xml
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@@ -74,12 +74,16 @@
<para>
Multiple BSPs can reuse the same <filename>KMACHINE</filename>
name if they are built using the same BSP description.
The "ep108-zynqmp" and "qemuzynqmp" BSP combination
in the <filename>meta-xilinx</filename>
layer is a good example of two BSPs using the same
<filename>KMACHINE</filename> value (i.e. "zynqmp").
See the <link linkend='bsp-descriptions'>BSP Descriptions</link> section
for more information.
Multiple Corei7-based BSPs could share the same "intel-corei7-64"
value for <filename>KMACHINE</filename>.
It is important to realize that <filename>KMACHINE</filename> is
just for kernel mapping, while
<ulink url='&YOCTO_DOCS_REF_URL;#var-MACHINE'><filename>MACHINE</filename></ulink>
is the machine type within a BSP Layer.
Even with this distinction, however, these two variables can hold
the same value.
See the <link linkend='bsp-descriptions'>BSP Descriptions</link>
section for more information.
</para>
<para>