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The pl011 driver looks for DT aliases of the form "serial<n>", and if found uses <n> as the device ID. This can cause /dev/ttyAMA0 to become /dev/ttyAMA1, which is confusing if the other serial port is provided by the 8250 driver which doesn't use the same logic.
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.