Serial link to OK6410-B

Some notes, as I progress. I have found that trying to apply the instructions for the FriendlyARM mini6410 board to my OK6410-B board is not smooth sailing.

Anyway, I have the serial connection with the board working. The board has a RS232 port. My laptop does not have a RS232 serial port, however the board is supplied with a (separate) "USB2.0 to RS232 Convertor" -- and it is truly a no-name brand, no manufacturer identification anywhere.

When the board starts up, it outputs to the serial port. For example, if I were to get Linux booting, then the bootup log would go to the serial port. It is, effectively, the operator console.

But, this requires a RS232 serial communications application running in Linux on my laptop. Wary and Racy have 'microcom', a commandline application.
However, there is a GUI app called 'cutecom', that requires Qt 3.x. In the Package Manager, you will find this in the 'puppy-3' repository.
When it installs Qt, some libraries are reported missing (libmysqlclient*) -- just ignore that.

The 'pl2303.ko' kernel driver is required, and this will load automatically when the usb-rs232 adaptor is plugged in. However, I had to manually load 'usbserial.ko':

# modprobe usbserial

Then, run 'cutecom' and type "/dev/ttyUSB0" into the interface-port box, "115200" into the baud-rate box, then click the "Open port" button.

Now we are in business. Turn on the OK6410 board, and bootup messages should appear in the cutecom window.

Posted on 19 Nov 2011, 18:14


Posted on 19 Nov 2011, 19:35 by FeodorF
Device PL-2303H/HX/X version chip
Prolific Technology Inc.
Search: PL-2303

Used this one for my LG cellphone.


Posted on 19 Nov 2011, 21:27 by Dougal
Kermit etc.
Barry, there was some discussion in the comments on LWN a while ago about serial console access, which seems to imply minicom is somewhat complicated to use... might want to use Kermit or screen:

Posted on 19 Nov 2011, 24:39 by FeodorF