Communicate

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Revision as of 09:35, 16 May 2009 by JulienB (Talk | contribs) (factorize RS232)

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How-To connect your Armadeus board to your development Host.

Forewords

The default connection uses a simple RS232 Null-Modem cable (with or without USB<->serial adapter).
As you will have to transfer some mega bytes of data, the Ethernet link is mandatory.
In order to use these two media with the APF target a terminal emulator (for RS232 link) and a TFTP server (for Ethernet link) have to be configured.

At this stage, you should have something looking like that (IP addresses may change):

BoardConnection.png

Serial Terminal configuration

You will need a Serial terminal emulator to communicate with U-Boot/Linux console. You can choose between:

We suggest you to use Kermit as Terminal emulator. Minicom was sadly reported to have problems when communicating with U-Boot (ZModem data transfer). If you just need a simple serial console and not to transfer data through the serial link, then GTKTerm is the perfect choice ! (gtkterm package in Ubuntu)

Note Note: Your terminal should now be configured with: 115200 bauds 8N1 parameters


TFTP server

In order to send your image files (U-Boot, Linux, rootfs or FPGA's firmware) at higher speed (than serial port) to your Armadeus board, you can use the Ethernet link and a TFTP server. Once the server configured, the files located in the server shared directory (/tftpboot by default) will be accessible from the U-Boot/Linux TFTP clients.

TFTP server installation

  • On *Ubuntu / Debian:
  [  ] $ sudo apt-get install tftpd xinetd

or use Synaptic

  • On Fedora:
  [  ] $ rpm -q tftpd xinetd
  • Then create the directory that will contain all the files that the server will export (root privileges needed):
  [  ] $ sudo mkdir /tftpboot
  [  ] $ sudo chmod 777 /tftpboot

Server configuration

  • Edit or create the configuration file /etc/xinetd.d/tftp and modify/add it the following lines:
# default: off
# description: The tftp server serves files using the trivial file transfer
#       protocol.  The tftp protocol is often used to boot diskless
#       workstations, download configuration files to network-aware printers,
#       and to start the installation process for some operating systems.
service tftp
{
       socket_type             = dgram
       protocol                = udp
       wait                    = yes
       user                    = root
       server                  = /usr/sbin/in.tftpd
       server_args             = -s /tftpboot
#       disable                 = yes
}

  • Restart xinetd service:
  [  ] $ sudo killall -HUP xinetd

For more information regarding how-to setup a tftp server please check one of many web how-to:

Links