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[ Upstream commitb0100bce4f] Since commit4b563a0666("ARM: imx: Remove imx21 support"), the config DEBUG_IMX21_IMX27_UART is really only debug support for IMX27. So, rename this option to DEBUG_IMX27_UART and adjust dependencies in Kconfig and rename the definitions to IMX27 as further clean-up. This issue was discovered with ./scripts/checkkconfigsymbols.py, which reported that DEBUG_IMX21_IMX27_UART depends on the non-existing config SOC_IMX21. Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Shawn Guo <shawnguo@kernel.org> Signed-off-by: Sasha Levin <sashal@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 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.