Embedded Linux

[infosrig]

Hi folks!

I am trying to bring up the bluecat linux with ppc440 as per UG511 guide but unable to see any response in hyperterminal(Windows Xp), doubted the null modem cable. Tested loop back, could type in the terminal window and found working.

But when connected to ML507 board and burned bit file from xilinx also downloaded helloworld_executable.elf by XMD then ran, could see the walking LEDs but nothing appeered in terminal window. so stuck at here and unable to proceed in linux steps.

Used this settings 

Bd rate      : 115200

Data bits   : 8

Parity        : None

Stop bits   : 1

Flow cntrl : None

Used teraterm in windows also tried minicom in centos with abouve settings but no reponse.

Ps: Didn't modified anything in the bit file, used bit file in the directory "ready_for_download"

Geeks....! Please help...

[austin · Accepted solution]

i,

Check that your RS232 TX and RX are going to the correct pins (TX of one, is RX of the other, so these two wires must cross-over -- it is called a "null-modem" cable).

If I recall correctly, when the application is started, the RS232 port of the board sends data.  If you have an oscilloscope, that would help you trace where the problem is.

[infosrig]

Thanks a lot Austin..!!!!  

Really great suggestion, I didn't  think about this, i trusted cable but actually the it  was connected in direct-direct pins(Manufacturing Defect I think). I re-wired like tx and rx crossed as you suggested and found working with Demo programs and could get the display.

I set 115200 as baud rate as suggested by the xilinx UG511, but unable to get output while running ppc(helloworld_executable.elf).  could see the fast blinking curser, when I change the speed to below this could  see some random charaters. i know this is issue with baudrate but couldn't guess.

do we need to rebuild the core with particular baud rate?

Any suggestions..? 

[austin]

i,

I am aware that there are some designs that use 9600 baud, and others use 115200.

I would check the documentation for the demo designs.  If you wish another baud rate you will have to find and change that value in the design, and re-build it.

[infosrig]

Thanks Austin...!!