write messages to serial console

linuxgentoo · 04-09-2008, 12:06 AM

Hi,all
I want to print message to serial console while booting kernel

in init/main.c i found console_init() function
after this function,my serial console can work ,right?

thanks

brianmcgee · 04-09-2008, 01:27 AM

You may write messages to console via grub passing the following kernel options:

Code:

kernel /vmlinuz-2.6.9-67.0.4.ELsmp ro console=ttyS0,115200

ttySX is the name of the serial console, 115200 is the baud setting.

linuxgentoo · 04-09-2008, 01:51 AM

Quote:

Originally Posted by brianmcgee

You may write messages to console via grub passing the following kernel options:

Code:

kernel /vmlinuz-2.6.9-67.0.4.ELsmp ro console=ttyS0,115200

ttySX is the name of the serial console, 115200 is the baud setting.

thanks for your reply
but if do it like the above,it will output all kernel message to serial console

what i want is that output some message to serial console

like that after ttyS0 is avaiable to write,i can print message to serial console