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The SPRD serial driver need to know which serial port would be used as console in an early period during initialization, the purpose is to keep the console port alive as possible even if there's some error caused by no clock configured under serial devicetree nodes. But with the patch [1], the console port couldn't be identified if missing console command line. So this patch adds using another interface to do check by reading stdout-path. [1] https://lore.kernel.org/lkml/20190826072929.7696-4-zhang.lyra@gmail.com/ Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com> Reviewed-by: Baolin Wang <baolin.wang7@gmail.com> Link: https://lore.kernel.org/r/20200316101930.9962-2-zhang.lyra@gmail.com 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.
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.