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The console= kernel command-line parameter defines where the kernel messages appear. It can be used multiple times to make the kernel log visible on more devices. The ordering of the console= parameters is important. In particular, the last one defines which device can be accessed also via /dev/console. The behavior is more complicated when the last console= parameter is ignored by kernel. It might be surprising because it was not intentional. The kernel just works this way historically. There were few attempts to change the behavior. Unfortunately, it can't be done because it would break existing users. Document the historical behavior at least. Link: https://lore.kernel.org/r/20170606143149.GB7604@pathway.suse.cz Link: https://lore.kernel.org/r/20230213113912.1237943-1-rkanwal@rivosinc.com Signed-off-by: Petr Mladek <pmladek@suse.com> Link: https://lore.kernel.org/r/20230308112433.24292-1-pmladek@suse.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.