On Fri, 07 Aug 2015 15:03:52 -0400 Roberto Alejandro Espi Munoz <raespi@xxxxxxx> 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@xxxxxxx> 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 > > > > _______________________________________________ > > barebox mailing list > > barebox@xxxxxxxxxxxxxxxxxxx > > http://lists.infradead.org/mailman/listinfo/barebox > > > > _______________________________________________ > barebox mailing list > barebox@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/barebox -- -- Best regards, Antony Pavlov _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
