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kernel-dev: Updates to "Using Kernel Metadata in a Recipe"

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This section had some old emenlo examples and was a little
confusing.  I removed the old examples and inserted some new
wordings to help smooth it out.

(From yocto-docs rev: 365129e0cd37772f404d96a51eb498210e4f1ee9)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2017-10-02 12:59:32 -07:00
committed by Richard Purdie
parent 94e71dea32
commit 99151aef77
1 changed files with 10 additions and 21 deletions
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documentation/kernel-dev/kernel-dev-advanced.xml
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@@ -44,20 +44,18 @@
<title>Using Kernel Metadata in a Recipe</title> <title>Using Kernel Metadata in a Recipe</title>
<para> <para>
The kernel sources in the Yocto Project contain kernel Metadata, which As mentioned in the introduction, the Yocto Project contains kernel
is located in the <filename>meta</filename> branches of the kernel Metadata, which is located in the
source Git repositories. <filename>yocto-kernel-cache</filename> Git repository.
This Metadata defines Board Support Packages (BSPs) that This Metadata defines Board Support Packages (BSPs) that
correspond to definitions in linux-yocto recipes for the same BSPs. correspond to definitions in linux-yocto recipes for corresponding BSPs.
A BSP consists of an aggregation of kernel policy and enabled A BSP consists of an aggregation of kernel policy and enabled
hardware-specific features. hardware-specific features.
The BSP can be influenced from within the linux-yocto recipe. The BSP can be influenced from within the linux-yocto recipe.
<note> <note>
Linux kernel source that contains kernel Metadata is said to be A Linux kernel recipe that contains kernel Metadata (e.g.
"linux-yocto style" kernel source. inherits from the <filename>linux-yocto.inc</filename> file)
A Linux kernel recipe that inherits from the is said to be a "linux-yocto style" recipe.
<filename>linux-yocto.inc</filename> include file is said to be a
"linux-yocto style" recipe.
</note> </note>
</para> </para>
@@ -92,9 +90,9 @@
<note> <note>
You can use the <filename>KBRANCH</filename> value to define an You can use the <filename>KBRANCH</filename> value to define an
alternate branch typically with a machine override as shown here alternate branch typically with a machine override as shown here
from the <filename>meta-emenlow</filename> layer: from the <filename>meta-yocto-bsp</filename> layer:
<literallayout class='monospaced'> <literallayout class='monospaced'>
KBRANCH_emenlow-noemgd = "standard/base" KBRANCH_edgerouter = "standard/edgerouter"
</literallayout> </literallayout>
</note> </note>
</para> </para>
@@ -133,16 +131,7 @@
recipe. recipe.
The tools use the first BSP description it finds that match The tools use the first BSP description it finds that match
both variables. both variables.
If the tools cannot find a match, they issue a warning such as If the tools cannot find a match, they issue a warning.
the following:
<literallayout class='monospaced'>
WARNING: Can't find any BSP hardware or required configuration fragments.
WARNING: Looked at meta/cfg/broken/emenlow-broken/hdw_frags.txt and
meta/cfg/broken/emenlow-broken/required_frags.txt in directory:
meta/cfg/broken/emenlow-broken
</literallayout>
In this example, <filename>KMACHINE</filename> was set to "emenlow-broken"
and <filename>LINUX_KERNEL_TYPE</filename> was set to "broken".
</para> </para>
<para> <para>