MPC83xx console : no output after handover

Matthew L. Creech mlcreech at
Fri Apr 3 02:20:22 EST 2009

On Thu, Apr 2, 2009 at 6:52 AM, Gary Thomas <gary at> wrote:
> Can you share what you had and what you changed it to?  I'm
> running on very similar systems and may face this exact problem
> soon.
> Thanks

I don't actually have a platform-specific bus, but I misread the help
text for CONFIG_SERIAL_OF_PLATFORM and thought that it applied to any
system whose serial port was configured via the DTS file.  So I had:


The result was that my console's serial port was initialized correctly
by the 8250 driver, but then of_platform_serial_probe() immediately
stomped on it.  (Not sure what it was doing exactly, I just traced
through far enough to see that printk() worked before
serial8250_register_port() was called in of_serial.c, and not

The "fix" for me was simply to disable CONFIG_SERIAL_OF_PLATFORM, as
it's unnecessary in my case.

Matthew L. Creech

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