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Revision as of 15:43, 16 April 2018 by JulienB (Talk | contribs) (Installation)

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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. (For more informations on remote console)


The 'sudo' command requires from the user to be registered in the 'sudo' group or to be in the sudoers list on your PC.

On *Ubuntu / Debian

$ sudo apt-get install ckermit

you may have to configure your distribution to accept compatible software from the internet. This can be done through the synaptic package manager

-> repositories.. ->debian software -> Non-DFSG-compatible software.

To avoid using sudo or root, add your user (here mylogin) in dialout group:

$ sudo adduser mylogin dialout

then close and re-open your graphical session, to make group changes taken into account.

On Fedora

# rpm -q ckermit

On OpenSUSE 11.3

# sudo zypper addrepo Contrib
# zypper install ckermit


  • Edit/Create .kermrc file in your $HOME/ directory (ex: /home/james/.kermrc) and fill it with:
set line /dev/ttyS0
set speed 115200
set carrier-watch off
set handshake none
set flow-control none
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 or /dev/ttyACM0
  • 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),...


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

then recheck that you have read/write rights on the serial port (Typically on Ubuntu: you are not member of "dialout" group). On OpenSUSE 11.3 you may need to be in "dialout" and 'uucp" groups and give the rights to write in /var/lock:

sudo chmod 777 /var/lock
  • 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
## Ready for binary (kermit) download to 0xA0000000 at 115200 bps...

Then type <Ctrl-\>c and send your file with command :

kermit> send filename