[Arm-netbook] Cannot get uart o/p from kernel at bootup/shutdown

[Alejandro Martínez]

I've had a bit of problems with gtkterm, the console did also hang
sometimes for me. Try with minicom, it works fine here.

On Sun, Apr 22, 2012 at 12:03 PM, Barry Kauler <bkauler at gmail.com> wrote:
> There was some discussion on setting up the serial-usb converter in
> the "ultra beginner guide" thread of this list:
>
> http://lists.phcomp.co.uk/pipermail/arm-netbook/2012-March/thread.html
>
> I had a go at compiling the 2.6.36 kernel, but it didn't work. So, I
> decided that I needed to setup the serial-usb converter to log what
> happens at bootup.
>
> Tom very kindly included a serial-usb converter with my Mele order,
> and I connected it from the uart socket to my laptop. It must be
> connected correctly, because it does work, kind of.
>
> Using Tom's Ubuntu SD image...
>
> I have to go through a careful sequence. I plug in the usb cable from
> the converter to my laptop and start Gtkterm. I then plug in the power
> to the Mele, and this is what I get:
>
> http://distro.ibiblio.org/quirky/test/uart-boot.png
>
> ...but notice the cursor has frozen, there is no log of the kernel
> bootup. In fact, nothing more comes through.
>
> If I quit Gtkterm. unplug the usb cable, replug it, then choose to
> shutdown the Mele, I get this:
>
> http://distro.ibiblio.org/quirky/test/uart1.png
>
> But again it just freezes at that point shown by the cursor.
>
> This is just Tom's SD image, his kernel. It includes the recommended
> boot param "console=ttyS0,115200"
>
> Can anyone suggest anything to fix this? It would seem the kernel o/p
> is not going to the uart?
>
> Regards,
> Barry Kauler
>
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