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ref-manual: Added TUNE_ARCH variable and edited TARGET_ARCH.

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Fixes [YOCTO 5463]

Added the TUNE_ARCH variable.  Also placed a cross-reference to
TUNE_ARCH in the TARGET_ARCH variable.

(From yocto-docs rev: 85d2a49323e0040b263b6d7f08fd036a25297b05)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2014-06-19 11:27:12 +03:00
committed by Richard Purdie
parent a548944ecf
commit 1c0229ebc8
1 changed files with 59 additions and 0 deletions
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59
documentation/ref-manual/ref-variables.xml
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@@ -8200,6 +8200,10 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
mips
mipsel
</literallayout>
For additional information on machine architectures, see
the
<link linkend='var-TUNE_ARCH'><filename>TUNE_ARCH</filename></link>
variable.
</para>
</glossdef>
</glossentry>
@@ -8796,6 +8800,61 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
</glossdef>
</glossentry>
<glossentry id='var-TUNE_ARCH'><glossterm>TUNE_ARCH</glossterm>
<glossdef>
<para>
The GNU canonical architecture for a specific architecture
(i.e. <filename>arm</filename>,
<filename>armeb</filename>,
<filename>mips</filename>,
<filename>mips64</filename>, and so forth).
BitBake uses this value to setup configuration.
</para>
<para>
<filename>TUNE_ARCH</filename> definitions are specific to
a given architecture.
The definitions can be a single static definition, or
can be dynamically adjusted.
You can see details for a given CPU family by looking at
the architecture's <filename>README</filename> file.
For example, the
<filename>meta/conf/machine/include/mips/README</filename>
file in the
<ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
provides information for <filename>TUNE_ARCH</filename>
specific to the <filename>mips</filename> architecture.
</para>
<para>
<filename>TUNE_ARCH</filename> is tied closely to
<link linkend='var-TARGET_ARCH'><filename>TARGET_ARCH</filename></link>,
which defines the target machine's architecture.
The BitBake configuration file
(<filename>meta/conf/bitbake.conf</filename>) sets
<filename>TARGET_ARCH</filename> as follows:
<literallayout class='monospaced'>
TARGET_ARCH = "${TUNE_ARCH}"
</literallayout>
</para>
<para>
The following list, which is by no means complete since
architectures are configurable, shows supported machine
architectures:
<literallayout class='monospaced'>
arm
i586
x86_64
powerpc
powerpc64
mips
mipsel
</literallayout>
</para>
</glossdef>
</glossentry>
<glossentry id='var-TUNE_CCARGS'><glossterm>TUNE_CCARGS</glossterm>
<glossdef>
<para>