I was unfortunately tied up with other tasks for the last couple of weeks, but wanted to follow up on my earlier post regarding the re-mapping of UART2 at runtime.
The commands suggested by Jesse do work using kernel version 2.6.39.

Best Regards,

Dave Billin

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

e-mail: david.billin@vandals.uidaho.edu




From: david.billin@vandals.uidaho.edu
To: gumstix-users@lists.sourceforge.net
Date: Thu, 27 Oct 2011 19:33:20 -0700
Subject: Re: [Gumstix-users] Re-muxing Overo UART2 at runtime

Jesse,

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

e-mail: david.billin@vandals.uidaho.edu



> Date: Thu, 27 Oct 2011 16:01:44 -0700
> From: jesse@celestialaudio.com
> To: gumstix-users@lists.sourceforge.net
> 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:
> <http://old.nabble.com/Overo-Air-bluetooth-and-wifi-power-td28775963.html#a28907238>
>
> 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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