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ref-manual: Edits to the create more free space question. 

(From yocto-docs rev: e1bfd2f51a6e63c2db6569ff6f9b017dd14e0b0c)

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 2013-03-29 09:13:29 -07:00 committed by Richard Purdie
parent 51a17ad8ea
commit c010d90d94
1 changed files with 29 additions and 9 deletions
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38
documentation/ref-manual/faq.xml
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@ -453,15 +453,35 @@
</question>
<answer>
<para>
Images are created to be 1.2 times the size of the populated root filesystem.
To modify this ratio so that there is more free space available, you need to
set the configuration value <filename>IMAGE_OVERHEAD_FACTOR</filename>.
For example, setting <filename>IMAGE_OVERHEAD_FACTOR</filename> to 1.5 sets
the image size ratio to one and a half times the size of the populated
root filesystem.
<literallayout class='monospaced'>
IMAGE_OVERHEAD_FACTOR = "1.5"
</literallayout>
By default, the OpenEmbedded build system creates images
that are 1.3 times the size of the populated root filesystem.
To affect the image size, you need to set various
configurations:
<itemizedlist>
<listitem><para><emphasis>Image Size:</emphasis>
The OpenEmbedded build system uses the
<link linkend='var-IMAGE_ROOTFS_SIZE'><filename>IMAGE_ROOTFS_SIZE</filename></link>
variable to define the size of the image in Kbytes.
The build system determines the size by taking into
account the initial root filesystem size before any
modifications such as requested size for the image and
any requested additional free disk space to be
added to the image.</para></listitem>
<listitem><para><emphasis>Overhead:</emphasis>
Use the
<link linkend='var-IMAGE_OVERHEAD_FACTOR'><filename>IMAGE_OVERHEAD_FACTOR</filename></link>
variable to define the multiplier that the build system
applies to the initial image size, which is 1.3 by
default.</para></listitem>
<listitem><para><emphasis>Additional Free Space:</emphasis>
Use the
<link linkend='var-IMAGE_ROOTFS_EXTRA_SPACE'><filename>IMAGE_ROOTFS_EXTRA_SPACE</filename></link>
variable to add additional free space to the image.
The build system adds this space to the image after
it determines its
<filename>IMAGE_ROOTFS_SIZE</filename>.
</para></listitem>
</itemizedlist>
</para>
</answer>
</qandaentry>