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22f88e3113
The MBUS (and its associated controller) is the bus in the Allwinner SoCs that DMA devices use in the system to access the memory. Among other things (and depending on the SoC generation), it can also enforce priorities or report bandwidth usages on a per-master basis. One of the most notable thing is that instead of having the same mapping for the RAM than the CPU, it maps it at address 0, which means we'll have to do address translation thanks to the dma-ranges property. Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.