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97738374a3
The MT7621 documentation says that the sys clock - also known as OCP clock for the Open Core Protocol - can be configured to 1/3 or 1/4 of the CPU clock. Testing on my hardware, using the fact that the SPI clock is based on the OCP clock and measuring transfer rates, shows a clock of a little over 200MHz with a CPU clock of 900MHz. So assume 1/4 is the default. Also, the nor-flash in the gbpc1 is documented as accepting 50MHz for request requests, and higher for other requests. So set maximum to 50MHz. Signed-off-by: NeilBrown <neil@brown.name> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.