hi ! i was wondering how to make kernel messages appear on /dev/ttyS0 without a reboot, i.e. kernelparam "console=ttyS0"
after playing for a while with setconsole, setterm and klogconsole i didn`t find a way to make that happen. i can do "setconsole /dev/tty1 </dev/console" and then "echo test >/dev/console" and see "test" on tty1 "setterm -msg on -msglevel 8 >/dev/console" (or >/dev/tty1), modprobe loop;rmmod loop - and i see the kernel message there i can do "setconsole /dev/ttyS0 </dev/console" and then "echo test >/dev/console" and see "test" on ttyS0 BUT : "setterm -msg on -msglevel 8 >/dev/console" (or >/dev/ttyS0), modprobe loop;rmmod loop ...... nothing! since i came across jan`s posting from 2005, which didn`t get a reply i think it`s not that stupid to ask again... any clue how to do that at runtime or what`s the issue here ? (see excerpts below) i can set regards roland List: linux-kernel Subject: Redirect kernel console From: Jan Engelhardt <jengelh () linux01 ! gwdg ! de> Date: 2005-08-13 12:48:22 Message-ID: Pine.LNX.4.61.0508131447220.4457 () yvahk01 ! tjqt ! qr [Download message RAW] Hi, there is a klogconsole utiltity that allows to change the console to which kernel messages are printed. However, is it possible to redirect to ttyS0 without a reboot? Jan Engelhardt ------- >> Subject: Re: serial console _after_ boot ? >> > Setterm outputs the correct escape sequences to stdout. You can >> > configure another tty using 'setterm -msglevel 8 -msg on > /dev/ttyS0'. >> > I tested this on the standard kernel consoles (/dev/tty1-9), and it >> > worked. You obviously need root access to write the escape sequences to >> > the tty's. >> >> oh - yes, this works! but with tty1-9 only. >> not with ttyS0 :( > >.....as the docs tell..... > > Some options however (marked "virtual consoles only" below) do not > correspond to a terminfo(5) capability. > > -msg [on|off] (virtual consoles only) > Enables or disables the sending of kernel printk() messages to > the console. > > -msglevel 1-8 (virtual consoles only) > Sets the console logging level for kernel printk() messages. > All messages strictly more important than this > will be printed, so a logging level of 0 has the same effect > as -msg on and a logging level of 8 will print > all kernel messages. klogd(8) may be a more convenient > interface to the logging of kernel messages. > > > but i don`t have change_console. > > > searched the net and found that this eventually should be part of > > > sysvinit package. > > > but mine doesn`t provide that tool. > > > > > > found "setconsole" which looks like something similar, but "setconsole > > > /dev/ttyS0 < /dev/console" > > > doesn`t have any effect > > > > What distribution do you use? I have change_console on gentoo, yet I > > cannot find the tool on a debian etch. But that's a vserver, so it's > > probably not a reference. > > i have opensuse 10.3 _____________________________________________________________________ Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! http://smartsurfer.web.de/?mc=100071&distributionid=000000000066 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/