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Without a serial console speed specified in chosen/stdout-path in the DTB, the serial console uses the default speed of the serial driver, unless explicitly overridden in a legacy console= kernel command-line parameter. After dropping "ti,omap3-uart" from the list of compatible values in DT, AM33xx serial ports can no longer be used with the legacy OMAP serial driver, but only with the OMAP-flavored 8250 serial driver (which is mutually-exclusive with the former). However, replacing CONFIG_SERIAL_OMAP=y by CONFIG_SERIAL_8250_OMAP=y (with/without enabling CONFIG_SERIAL_8250_OMAP_TTYO_FIXUP) may not be sufficient to restore serial console functionality: the legacy OMAP serial driver defaults to 115200 bps, while the 8250 serial driver defaults to 9600 bps, causing no visible output on the serial console when no appropriate console= kernel command-line parameter is specified. Fix this for all AM33xx boards by adding ":115200n8" to chosen/stdout-path. This requires replacing the "&uartN" reference by the corresponding "serialN" DT alias. Fixes:ca8be8fc2c("ARM: dts: am33xx-l4: fix UART compatible") Fixes:077e1cde78("ARM: omap2plus_defconfig: Enable 8250_OMAP") Closes: https://lore.kernel.org/CAMuHMdUb7Jb2=GqK3=Rn+Gv5G9KogcQieqDvjDCkJA4zyX4VcA@mail.gmail.com Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com> Tested-by: Matti Vaittinen <mazziesaccount@gmail.com> Reviewed-by: Bruno Thomsen <bruno.thomsen@gmail.com> Link: https://lore.kernel.org/r/63cef5c3643d359e8ec13366ca79377f12dd73b1.1759398641.git.geert+renesas@glider.be Signed-off-by: Kevin Hilman <khilman@baylibre.com>
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 reStructuredText 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.