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MACH_REALTEK_RTL declares that the system supports early printk , but this is not actually implemented as intended. The system is left with a non-functional early0 console because the setup_8250_early_printk_port() call provided for MIPS_GENERIC is never used to set this up. Generic ns16550a earlycon works, so devices should use that for early output. This means that SYS_HAS_EARLY_PRINTK and USE_GENERIC_EARLY_PRINTK_8250 do not need to be selected. Additionally, as reported by Lukas Bulwahn, the selected symbol SYS_HAS_EARLY_PRINTK_8250 does not actually exist, so should also be dropped. Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com> Cc: Bert Vermeulen <bert@biot.com> Signed-off-by: Sander Vanheule <sander@svanheule.net> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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.