Thanks for the reply.  I'll try this out first thing tomorrow.  Can you confirm that you are using the latest kernel version (2.6.39)?
I completely agree that this info should be included in the Wiki.  Perhaps I'll write something up when I've finished.

Best Regards,

Dave Billin

Graduate Research Assistant --MS Computer Engineering
University of Idaho
Moscow, Idaho 83844


> Date: Thu, 27 Oct 2011 16:01:44 -0700
> From:
> To:
> Subject: Re: [Gumstix-users] Re-muxing Overo UART2 at runtime
> Hello! Wow, a question a newbie like me can actually answer! :) Nice
> to be able to 'give back' to the list.
> I have done this exact thing, with a Tobi board, and here's the shell
> script.
> echo "UART2 (/dev/ttyS1) config register1: 0x48002170, set to GPIO input
> w/pullup"
> devmem2 0x48002170 w 0x011C011C
> echo
> echo "UART2 (/dev/ttyS1) config register2: 0x48002178, set to UART RX
> and TX"
> devmem2 0x48002178 w 0x01180000
> echo
> I disabled bluetooth by renaming /etc/init.d/bluetooth file, but I still
> get lots of bluetooth messages in dmesg. Not sure if it is actually
> disabled, but the serial works:
> <>
> It would be great to have these exact steps in the wiki or official
> gumstix docs. Wanting a 2nd serial port is not uncommon at all and it
> took some effort to get it going. It absolutely should have been
> clearly documented by gumstix.
> Let me know if it works or not...
> J
> > Has anyone been able to use devmem2 at runtime to re-mux Overo UART2
> > Tx/Rx to the GPIO146_PWM11/GPIO147_PWM8 signals on the 40-pin TOBI
> > header? I have successfully re-muxed these signals using a modified
> > u-boot, but I'm wondering whether the same thing can be done in a
> > shell script using devmem2 after the kernel has booted.
> >
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