CODEWITHSUNDEEP
linuxlinux-kernelconsoleembedded-linuxtty
dinesh
dinesh

Reputation: 805

Display Linux boot messages on tty1 instead of ttyS1

I'm working on an embedded Linux system with a display panel. The system is setup to output boot messages through the serial port on the system /dev/ttyS1. I'm trying to get these messages to show up on the display,tty1, and I'm looking for suggestions on how I go about doing this.

I tried changing the kernel command line from console=ttyS1 to console=tty1; this has no effect. Even with the change above boot messages are sent only to the serial port. I verified that the change to the kernel command line did take effect by querying cat /proc/cmdline

The last step of the boot process spawns getty to tty1 and the login screen does appear on the panel. The panel itself is initialized much earlier in the boot sequence.

EDIT: @artless noise pointed out that sending the console to the virtual terminal requires a change in the kernel config. And indeed it does. Follow the steps below to enable console output on virtual terminal 

make menuconfig

and from the displayed GUI select the following 

Device Drivers -> Character devices -> Support for console in virtual terminal

When invoking make you may need to provide additional options (ARCH, CROSS_COMPILE etc.) depending on the target you're building for.

Upvotes: 2

Views: 3182

Answers (1)

Claudio
Claudio

Reputation: 10947

Command line options can be provided either by the bootloader (e.g., u-boot bootargs) or hardcoded when configuring the kernel.

I know that on some older versions of the Linxu kernel, hard-coded options erroneously overwrote bootloader options.

So, have a look at the .config file and see if the wrong console has been set there.

Upvotes: 3

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