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Documentation: kernel-parameters: Add DEVNAME:0.0 format for serial ports
Document the console option for DEVNAME:0.0 style addressing for serial ports. Suggested-by: Sebastian Reichel <sre@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Dhruva Gole <d-gole@ti.com> Link: https://lore.kernel.org/r/20240327110021.59793-8-tony@atomide.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Documentation/networking/netconsole.rst for an
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alternative.
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<DEVNAME>:<n>.<n>[,options]
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Use the specified serial port on the serial core bus.
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The addressing uses DEVNAME of the physical serial port
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device, followed by the serial core controller instance,
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and the serial port instance. The options are the same
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as documented for the ttyS addressing above.
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The mapping of the serial ports to the tty instances
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can be viewed with:
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$ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
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/sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
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In the above example, the console can be addressed with
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console=00:04:0.0. Note that a console addressed this
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way will only get added when the related device driver
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is ready. The use of an earlycon parameter in addition to
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the console may be desired for console output early on.
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uart[8250],io,<addr>[,options]
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uart[8250],mmio,<addr>[,options]
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uart[8250],mmio16,<addr>[,options]
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