Hi Tony, On Mar 27, 2024 at 12:59:41 +0200, Tony Lindgren wrote: > Document the console option for DEVNAME:0.0 style addressing for serial > ports. Thanks, this will really add in more context for people unaware. > > Suggested-by: Sebastian Reichel <sre@xxxxxxxxxx> > Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx> > --- > .../admin-guide/kernel-parameters.txt | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -785,6 +785,25 @@ > Documentation/networking/netconsole.rst for an > alternative. > > + <DEVNAME>:<n>.<n>[,options] > + Use the specified serial port on the serial core bus. > + The addressing uses DEVNAME of the physical serial port > + device, followed by the serial core controller instance, > + and the serial port instance. The options are the same > + as documented for the ttyS addressing above. > + > + The mapping of the serial ports to the tty instances > + can be viewed with: > + > + $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/* > + /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0 > + > + In the above example, the console can be addressed with > + console=00:04:0.0. Note that a console addressed this > + way will only get added when the related device driver > + is ready. The use of an earlycon parameter in addition to > + the console may be desired for console output early on. Reviewed-by: Dhruva Gole <d-gole@xxxxxx> -- Best regards, Dhruva
