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fb2eda79be
The /soc/dma-ranges property on BCM2835 currently results in DMA addresses in the range 0x40000000-0x5fffffff. This will allocate in the system L2 cache, which may adversely affect performance. Change the dma-ranges property to give addresses in the range 0x80000000-0x9fffffff, which are coherent with L2 but non-allocating. See: https://github.com/raspberrypi/linux/issues/3602 Signed-off-by: Phil Elwell <phil@raspberrypi.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.