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8d97083c0b
UART2 and UART4 can used in following combination, 2 x RS232: - UART2 and UART4 without flow control - MUX selection GPIO3_20 must be held low 1 x RS232 + 1 x RS485: - UART2 - RS232 - UART4 - RS485 - MUX selection GPIO3_20 must be held high - RE/DE for RS485 controlled with GPIO3_25 1 x RS232 with flow control: - UART2 - RS232 - MUX selection GPIO3_20 must be held low Signed-off-by: Parthiban Nallathambi <parthiban@linumiz.com> Signed-off-by: Shawn Guo <shawnguo@kernel.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 reStructuredText 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.