PandaBoard Minimal-FS serial

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EVEN MORE IMPORTANT: See Troubleshooting for up-to-date information and binaries. Information below is outdated.

Setting up your Validation Environment on your OMAP Platform
Overview Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8


Step 5


[edit] Linux Setup

This page describes how to connect between a Host PC and the OMAP Platform device.

[edit] Serial Terminal Setup

For a Linux machine, a serial terminal such as Minicom, screen, or Kermit can be used. Ubuntu users wanting a graphical terminal program can install gtkterm. On a Windows PC, you could use HyperTerminal, TeraTerm or PuTTY.

[edit] Install and Setup Minicom

Open a terminal.

Install minicom if it isn't installed on your system yet.

sudo apt-get install minicom

Search for USB device on Ubuntu:

dmesg | grep -e tty

A search on USB drivers from system log can also be helpful.

dmesg | grep usb

Select the right device:

...USB Serial Device converter now attached to ttyXXX < --- select the appropriate tty connection

note: The device name may vary from system to system and board to board. If connected using a USB2serial adapter then look for ttyUSBX. If you connect using a serial cable it might look like ttySX.

Open minicom and setup the serial connections as follows:

sudo minicom -s
           | Filenames and paths      |
           | File transfer protocols  |
           | Serial port setup        |
           | Modem and dialing        |
           | Screen and keyboard      |
           | Save setup as dfl        |
           | Save setup as..          |
           | Exit                     |
           | Exit from Minicom        |
//Select Serial port setup
//Select A and use the right USB device listed from the previous command previously
//Example: Blaze = /dev/ttyUSB2 | PandaBoard = /dev/ttyUSB0 
//Select F to turn off Flow Control
           | A -    Serial Device      : /dev/ttyUSB2                              |
           | B - Lockfile Location     : /var/lock                                 |
           | C -   Callin Program      :                                           |
           | D -  Callout Program      :                                           |
           | E -    Bps/Par/Bits       : 115200 8N1                                |
           | F - Hardware Flow Control : No                                        |
           | G - Software Flow Control : No                                        |
           |                                                                       |
           |    Change which setting?                                              |
//Press enter, save as default, exit
//Once the Modem is Initialized, press Ctrl A-Z-M
//This lists the main menu
            |                     Minicom Command Summary                       |
            |                                                                   |
            |          Commands can be called by CTRL-A <key>                   |
            |                                                                   |
            |               Main Functions                  Other Functions     |
            |                                                                   |
            | Dialing directory..D  run script (Go)....G | Clear Screen.......C |
            | Send files.........S  Receive files......R | cOnfigure Minicom..O |
            | comm Parameters....P  Add linefeed.......A | Suspend minicom....J |
            | Capture on/off.....L  Hangup.............H | eXit and reset.....X |
            | send break.........F  initialize Modem...M | Quit with no reset.Q |
            | Terminal settings..T  run Kermit.........K | Cursor key mode....I |
            | lineWrap on/off....W  local Echo on/off..E | Help screen........Z |
            | Paste file.........Y                       | scroll Back........B |
            |                                                                   |
            |      Select function or press Enter for none.                     |
            |                                                                   |
            |             Written by Miquel van Smoorenburg 1991-1995           |
            |             Some additions by Jukka Lahtinen 1997-2000            |
            |             i18n by Arnaldo Carvalho de Melo 1998                 |
//Once this starts up, the following will be output on terminal

Alternatively, you can edit the .minirc.dfl in the home directory. Change the port number pointing to the right device before starting minicom. Our .minirc.dfl looks like this:

pu port      /dev/ttyUSB2
pu rtscts    No

At this point, the bootloader starts the kernel. Some binaries autoboot while others may require bootargs to boot up. In case the platform autoboots, you may see a sample output as shown below. Else refer to the next step/boot-args section on the guide.

Sample output:

Texas Instruments X-Loader 1.41 (Jul 26 2010 - 19:26:00)                                                                                                
mmc read: Invalid size                                                                                                                                  
Starting OS Bootloader from MMC/SD1 ...                                                                                                                 
U-Boot 1.1.4-L24.6-dirty (Jul 27 2010 - 12:02:16)                                                                                                       
Load address: 0x80e80000                                                                                                                                
DRAM:  512 MB                                                                                                                                           
Flash:  0 kB                                                                                                                                            
In:    serial                                                                                                                                           
Out:   serial                                                                                                                                           
Err:   serial                                                                                                                                           
Net:   KS8851SNL                                                                                                                                        
Hit any key to stop autoboot:  0                                                                                                                        
mmc read: Invalid size                                                                                                                                  
3351176 bytes read
## Booting image at 80500000 ...
   Image Name:   Ubuntu Kernel
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    3351112 Bytes =  3.2 MB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
Starting kernel ...

A video walkthrough of the above process can be found below:

[edit] Alternative to minicom: Using screen

screen is installed by default of many Linux distributions.

First, find the tty for the serial port:

dmesg | grep tty

In the example below, ttyUSB0 is the USB-attached serial port:

[24542.443352] usb 2-1.2: Keyspan 1 port adapter converter now attached to ttyUSB0

Then simply start screen, passing in the serial port address and the speed:

screen /dev/ttyUSB0 115200

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