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serial: change defaults to bring back kernel logs

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It's actually more common for people to have graphical access
i.e. most BMCs offer this by default. On the other hand its confusing
if you don't get kernel logs on these outputs. That's why we now
prefer graphical ttys over serial, but still enable console access on
serial consoles
This commit is contained in:
Jörg Thalheim 2024-07-11 11:04:11 +02:00
parent 3ba7dcad7b
commit b6889c9fc1
1 changed files with 11 additions and 5 deletions
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16
nixos/common/serial.nix
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@ -33,16 +33,22 @@ in
# ubuntu and alpine linux are doing.
srvos.boot.consoles = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ "tty0" ] ++
default =
[ "ttyS0,115200" ] ++
(lib.optional (pkgs.stdenv.hostPlatform.isAarch) "ttyAMA0,115200") ++
(lib.optional (pkgs.stdenv.hostPlatform.isRiscV64) "ttySIF0,115200") ++
[ "ttyS0,115200" ];
[ "tty0" ];
example = [ "ttyS2,115200" ];
description = lib.mdDoc ''
The Linux kernel console option allows you to configure various devices as
consoles. The default setting is configured to provide access to serial
consoles, such as IPMI SOL console redirection found in BMCs or GPIO-based
serial terminals found in embedded devices. You can specify multiple `console=`
consoles.
The default setting will print kernel messages to graphical console (i.e. VGA/HDMI)
but also enables serial console output on the first serial port (ttyS0) at 115200.
This helps with getting emergency access IPMI SOL console redirection
found in BMCs or GPIO-based serial terminals found in embedded devices.
If you need to debug a kernel using serial console, you can either change the
setting adhoc in your bootloader or override the default with your own option.
You can specify multiple `console=`
options on the kernel command line, which will result in output appearing on all
of them. The last device specified will be used when opening /dev/console. This
information can be found in the Linux documentation at