Supressing console output with "quiet" option or console=NULL or console=/dev/null NOT working...
Posted on 2008-10-21
I have an embedded target on which I do not want console output to appear on-screen at boot time, nor do I want console data streaming out the serial port.
During development and test I would like a console on the screen or the serial port. I want to control this by changing my "console" parameter on the kernel command line I pass from my bootloader.
Some years ago I did this by setting console=NULL or console=/dev/null (I can't remember exactly). This suppressed all console output on a production unit.
For engineering use I would interrupt the bootloader and specify a "console=tty" (screen) or "console=tty0,115200" (serial port) option and get the console output as desired for engineering use.
For the 2.6.24 kernel I've tried a "quiet" option, but this is not working. I'm getting text on my LCD.
The only method that eliminates ALL output to my LCD is when I specify a "console=ttyPSC0,115200" (a serial port). This then routes all the console output to the port, but I don't want it there either!
Can anyone help me to understand why console=/dev/null is not working, or why the "quiet" option is not working? Thanks!