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[doc] Add some notes about PowerPC Architecture names

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Change-Id: I58eb3e442344bbbcf7c5d71c13688baaacd70105
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Tony Breeds 2017-06-26 13:24:06 +10:00 committed by Ian Wienand
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doc/source/user_guide/building_an_image.rst
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@ -506,11 +506,35 @@ image in. This will improve image build time by building it in RAM.
By default, the tmpfs file system uses 50% of the available RAM. By default, the tmpfs file system uses 50% of the available RAM.
Therefore, the RAM should be at least the double of the minimum tmpfs Therefore, the RAM should be at least the double of the minimum tmpfs
size required. size required.
For larger images, when no sufficient amount of RAM is available, tmpfs For larger images, when no sufficient amount of RAM is available, tmpfs
can be disabled completely by passing --no-tmpfs to disk-image-create. can be disabled completely by passing --no-tmpfs to disk-image-create.
ramdisk-image-create builds a regular image and then within that image ramdisk-image-create builds a regular image and then within that image
creates ramdisk. creates ramdisk.
If tmpfs is not used, you will need enough room in /tmp to store two If tmpfs is not used, you will need enough room in /tmp to store two
uncompressed cloud images. If tmpfs is used, you would still need /tmp space uncompressed cloud images. If tmpfs is used, you would still need /tmp space
for one uncompressed cloud image and about 20% of that image for working files. for one uncompressed cloud image and about 20% of that image for working files.
Chosing an Architecture
-----------------------
If needed you can specify an override the architecture selection by passing a
``-a`` argument like:
::
disk-image-create -a <arch> ...
Notes about PowerPC Architectures
+++++++++++++++++++++++++++++++++
PowerPC can operate in either Big or Little Endian mode. ``ppc64``
always refers to Big Endian operation. When running in little endian
mode it can be referred to as ``ppc64le`` or ``ppc64el``.
Typically ``ppc64el`` refers to a ``.deb`` based distribution
architecture, and ``ppc64le`` refers to a ``.rpm`` based distribution.
Regardless of the distribution the kernel architecture is always
``ppc64le``.