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documentation: More information about DL_DIR added.

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The information surrounding the central download directory was
pretty scant.  Jim Abernathy pointed this out in an email sent to
me.  As a start, I have added quite a bit more information to
the glossary description for DL_DIR.  Part of that added information
is a pointer to the FAQ entry that describes exactly how the
build system gets source files.  Then, in the YP Development Manual
in the section that introduces the build process, I added several
references to various variables that are set in the local.conf
file prior to kicking off the build.

Reported-by: Jim Abernathy <jim.abernathy@intel.com>
(From yocto-docs rev: 4d7835a3bff5bd054301fa9ab6954c11c88dad58)

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
2012-01-31 14:21:35 -06:00
committed by Richard Purdie
parent ddaf79d4d4
commit 62907f76bc
3 changed files with 47 additions and 5 deletions
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documentation/dev-manual/dev-manual-start.xml
+10 -3
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@@ -240,9 +240,16 @@
previous section.</para></listitem>
<listitem><para>Initialize the build environment by sourcing a build environment
script.</para></listitem>
<listitem><para>Optionally ensure the <filename>conf/local.conf</filename> configuration file is set
up how you want it.
This file defines the target machine architecture and other build options.</para></listitem>
<listitem><para>Optionally ensure the <filename>/conf/local.conf</filename> configuration file,
which is found in the Yocto Project build directory, is set up how you want it.
This file defines many aspects of the build environment including
the target machine architecture through the
<filename><ulink url='http://www.yoctoproject.org/docs/latest/poky-ref-manual/poky-ref-manual.html#var-MACHINE'>MACHINE</ulink></filename> variable,
the development machine's processor use through the
<filename><ulink url='http://www.yoctoproject.org/docs/latest/poky-ref-manual/poky-ref-manual.html#var-BB_NUMBER_THREADS'>BB_NUMBER_THREADS</ulink></filename> and
<filename><ulink url='http://www.yoctoproject.org/docs/latest/poky-ref-manual/poky-ref-manual.html#var-PARALLEL_MAKE'>PARALLEL_MAKE</ulink></filename> variables, and
a centralized tarball download directory through the
<filename><ulink url='http://www.yoctoproject.org/docs/latest/poky-ref-manual/poky-ref-manual.html#var-DL_DIR'>DL_DIR</ulink></filename> variable.</para></listitem>
<listitem><para>Build the image using the <command>bitbake</command> command.
If you want information on BitBake, see the user manual at
<ulink url='http://docs.openembedded.org/bitbake/html'></ulink>.</para></listitem>