Difference between revisions of "Kermit"

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Kermit is a serial line terminal emulator that allows you to take control of your board through the RS232 line. With it you can have access to the Linux console of your board without any keyboard/screen. ([http://tldp.org/HOWTO/Remote-Serial-Console-HOWTO/ For more informations])
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Kermit is a serial line terminal emulator that allows you to take control of your board through the RS232 line. With it you can have access to the U-Boot/Linux console of your APF without needing to connect a keyboard/screen to the board. ([http://tldp.org/HOWTO/Remote-Serial-Console-HOWTO/ For more informations on remote console])
  
 
==Installation==   
 
==Installation==   
Line 10: Line 10:
  
 
==Configuration==   
 
==Configuration==   
* Edit/Create .kermrc file in your $HOME directory and fill it with:
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* Edit/Create ''.kermrc'' file in your ''$HOME/'' directory and fill it with:
 
  set line /dev/ttyS0
 
  set line /dev/ttyS0
 
  set speed 115200
 
  set speed 115200
Line 23: Line 23:
 
  set window 5
 
  set window 5
 
  set transmit linefeed on
 
  set transmit linefeed on
* In this example, we assume that your serial port is ttyS0 (first serial port). Change this to correct value if necessary.
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* In this example, we assume that your serial port is ''/dev/ttyS0'' (first serial port). Change this to the appropriate value if necessary. For example if you use an ''USB <-> Serial'' converter then serial port would surely be named like that: ''/dev/ttyUSB0''
* If you use an ''USB <-> Serial'' converter then serial port would surely be named like that: ttyUSB0
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* If your ''USB <-> Serial'' converter doesn't seem to work, run the ''dmesg'' command. You should read [http://ubuntuforums.org/archive/index.php/t-392791.html this thread] if you see some disconnection data like this :
** If ''USB <-> Serial'' converter doesn't seem to work, run the ''dmesg'' command. You should read [http://ubuntuforums.org/archive/index.php/t-392791.html this thread] if you see some disconnection data like this :
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  [ 2445.568000] usb 1-1.4: new full speed USB device using uhci_hcd and address 22
 
  [ 2445.568000] usb 1-1.4: new full speed USB device using uhci_hcd and address 22
 
  ...
 
  ...
Line 31: Line 30:
 
  [ 2446.964000] ftdi_sio 1-1.4:1.0: device disconnected
 
  [ 2446.964000] ftdi_sio 1-1.4:1.0: device disconnected
  
* If you get an error message such:
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* Check that you have read/write rights on ''/dev/ttyS0'' (ie your serial port): your user ID (here julien) should be part of the serial port access group (here dialout):
$ kermit -c
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<pre class="host>
  /dev/ttyS0
+
$ ls -al /dev/ttyS0
  ?SET SPEED has no effect without prior SET LINE
+
crw-rw---- 1 root dialout 4, 64 2009-05-15 14:56 /dev/ttyS0
check that you have read/write rights on /dev/ttyS0 (ie your serial port)
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$ id
 +
uid=1000(julien) gid=1000(julien) groupes=4(adm),20(dialout),...
 +
</pre>
  
 
==Usage==   
 
==Usage==   
 
* To launch it:
 
* To launch it:
 +
<pre class="host>
 
  $ kermit -c
 
  $ kermit -c
 +
</pre>
 +
* If you get an error message such:
 +
<pre class="host>
 +
  /dev/ttyS0
 +
  ?SET SPEED has no effect without prior SET LINE
 +
</pre>
 +
then recheck that you have read/write rights on the serial port.
 
* To switch from terminal mode to command mode:
 
* To switch from terminal mode to command mode:
 
  CTRL + \ then c
 
  CTRL + \ then c

Revision as of 16:40, 15 May 2009

Kermit is a serial line terminal emulator that allows you to take control of your board through the RS232 line. With it you can have access to the U-Boot/Linux console of your APF without needing to connect a keyboard/screen to the board. (For more informations on remote console)

Installation

On *Ubuntu / Debian

$ sudo apt-get install ckermit

or use Synaptic graphical package manager.

On Fedora

# rpm -q ckermit

Configuration

  • Edit/Create .kermrc file in your $HOME/ directory and fill it with:
set line /dev/ttyS0
set speed 115200
set carrier-watch off
set handshake none
set flow-control none
robust
set file type bin
set file name lit
set rec pack 1000
set send pack 1000
set window 5
set transmit linefeed on
  • In this example, we assume that your serial port is /dev/ttyS0 (first serial port). Change this to the appropriate value if necessary. For example if you use an USB <-> Serial converter then serial port would surely be named like that: /dev/ttyUSB0
  • If your USB <-> Serial converter doesn't seem to work, run the dmesg command. You should read this thread if you see some disconnection data like this :
[ 2445.568000] usb 1-1.4: new full speed USB device using uhci_hcd and address 22
...
[ 2446.964000] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[ 2446.964000] ftdi_sio 1-1.4:1.0: device disconnected
  • Check that you have read/write rights on /dev/ttyS0 (ie your serial port): your user ID (here julien) should be part of the serial port access group (here dialout):
$ ls -al /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 2009-05-15 14:56 /dev/ttyS0
$ id
uid=1000(julien) gid=1000(julien) groupes=4(adm),20(dialout),...

Usage

  • To launch it:
 $ kermit -c
  • If you get an error message such:
  /dev/ttyS0 
  ?SET SPEED has no effect without prior SET LINE 

then recheck that you have read/write rights on the serial port.

  • To switch from terminal mode to command mode:
CTRL + \ then c
  • To switch from command mode to terminal mode:
C-Kermit>c then ENTER
  • To quit:
Switch in command mode
C-Kermit>q then ENTER

Usefull tips

  • Download a file via serial in U-Boot :
BIOS> loadb <Ctrl-\>c
kermit> send filename

Links