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| author | Tony Lindgren <tony@atomide.com> | 2024-07-03 12:06:10 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-04 15:41:44 +0200 |
| commit | 17199dfccd4b7f7e0c059ef43bef6e0078423476 (patch) | |
| tree | fba4025b6a4742737b409b474c9b7d1a7eb8bb06 /Documentation/admin-guide/kernel-parameters.txt | |
| parent | serial: core: Add serial_base_match_and_update_preferred_console() (diff) | |
| download | linux-17199dfccd4b7f7e0c059ef43bef6e0078423476.tar.xz linux-17199dfccd4b7f7e0c059ef43bef6e0078423476.zip | |
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>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240703100615.118762-4-tony.lindgren@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 27ec49af1bf2..11e57ba2985c 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -788,6 +788,25 @@ 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. + uart[8250],io,<addr>[,options] uart[8250],mmio,<addr>[,options] uart[8250],mmio16,<addr>[,options] |