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Author Topic: [SOLVED] How to get boot messages over a serial cable ?  (Read 1860 times)

Offline puefiko

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[SOLVED] How to get boot messages over a serial cable ?
« on: April 28, 2011, 05:08:31 PM »
Hi, TC gurus,
I am trying to capture the boot messages via a COM cable, and can't find the working kernel option.
Tried "serial" and "earlyprintk=serial" - nothing seen in the terminal...
I see the boot log on the screen when using "text" option, and dmesg works fine as well.
Is there a standard kernel option for this ?
Is it working on TC 3.3 ?

Thanks in advance!
« Last Edit: April 28, 2011, 06:28:13 PM by puefiko »

Offline danielibarnes

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Re: How to get boot messages over a serial cable ?
« Reply #1 on: April 28, 2011, 05:35:56 PM »
You need to specify console=ttySx where x is your COM port as explained in the kernel documentation.

Offline puefiko

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[SOLVED] Re: How to get boot messages over a serial cable ?
« Reply #2 on: April 28, 2011, 06:27:51 PM »
Thank you - it worked fine, I also added a second "console" option to get the debug messages on the monitor as well, otherwise they go to COM port only:

console=ttyS0 console=tty0