serial port weird chars ...

Roberto Alejandro Espi Munoz raespi at
Mon Aug 10 05:16:15 PDT 2015

Supposing that's the issue, is there an option in barebox that I could 
use to circumvent this ?

Thanks for the replies ...

On 08/08/2015 11:23 AM, Antony Pavlov wrote:
> On Fri, 07 Aug 2015 15:03:52 -0400
> Roberto Alejandro Espi Munoz <raespi at> wrote:
>> Both scenarios work well on another host.  On my host serial port when
>> interacting with one bootloader the communication is fine and with
>> barebox fails.  When using a USB-serial adapter there's no problem.
>> Perhaps there's a problem on my board but why does the first connection
>> work and with barebox doesn't ?
> May be barebox programs UART clocks in a slightly different way than S3C2440A USB Downloader does,
> so waveform for one character is too short or too long for your host computer UART receiver?
> IMHO a logic analyzer can help you. Use it to compare output mini2440 UART waveform from USB Downloader
> with output UART waveform from barebox.
>> On 08/07/2015 12:41 PM, Antony Pavlov wrote:
>>> On Fri, 07 Aug 2015 10:41:12 -0400
>>> Roberto Alejandro Espi Munoz <raespi at> wrote:
>>>> Hi ... I'm currently having some trouble with displaying characters
>>>> correctly in my terminal.  I'm using a board equivalent to the
>>>> mini2440.  This one has a NOR and a NAND.  I connect to it over a serial
>>>> port interface.  When I boot up the board in debug mode I'm able to see
>>>> clearly the messages displayed by the S3C2440A USB Downloader which is
>>>> copied in the NOR interface, I then download my barebox binary over the
>>>> USB interface and when it boots I get a lot of weird characters on
>>>> screen.  The console seems to respond correctly, I issue for example the
>>>> "reset" command and it resets but I can't make out what is displayed.
>>>> I was guessing at first a serial port configuration problem on my
>>>> operating system (I use Linux), tried it over on Windows and same
>>>> effect, the first bootloader works great and barebox when starting just
>>>> mangles the characters.
>>>> The other weird problem is than when I use a USB-Serial converter to
>>>> connect to the board's serial port everything works !
>>>> I'm currently using barebox 2012.09 and OpenSuse Linux 13.2
>>>> Any ideas ? thanks
>>> You have the problem if you use your host computer motherboard serial port (no matter, Linux or Windows),
>>> isn't it?
>>> And no problem if you use USB-Serial dongle. So it looks like host serial port problem.
>>> Could you try to connect the board to another host computer?
>>> -- 
>>> Best regards,
>>>     Antony Pavlov
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