How to use Kermit

1 install: sudo apt-get install ckermit

2 commands:

connect(c)	connect to serial device (kermit -c)
ctrl+\ & c	switch to Kermit cmd prompt from serial port
quit(q)	exit from Kermit
log session	save info in session.log at current direction
send	send file using Kermit protocol to uboot
transmit	send txt file to board
run	execute external command(eg, calling xmodem for sending files)
!	leave Kermit to execute a shell. When exit the shell, it will return to Kermit
?	show all commands

3 download file into development board:

         Step-1: loadb 0x200000 (at uboot prompt)

         Step-2: send ~/uImage (at kermit prompt)

4 use Kermit for normal user:

         Configure ~/.kermrc and get permission for /dev/ttyUSB0

         # ls -l /dev/ttyUSB0

         crw-rw---- 1 root uucp 4, 64 07-17 03:53 /dev/ttyUSB0

         # groupmems -a kery -g uucp

5 configure Kermit:

First, kermit uses ~/.kermrc for initializing, or it is not exist then uses /etc/kermit/kermrc.

#sudo gedit /etc/kermit/kermrc (# cat > ~/.kermrc):

set line /dev/ttyUSB0

set speed 115200

set handshake none

set flow-control none

set carrier-watch off

robust

set file type bin

set file name lit

set rec pack 1000

set send pack 1000

set window 5

set transmit echo on

set transmit pause 20

set transmit timeout 1

set transmit prompt 62

set prompt Kermit>

define sz !sz \%1 \%2 \%3 \%4 \%5 \%6 \%7 \%8 \%9 < \v(line) > \v(line)

define rz !rz \%1 \%2 \%3 \%4 \%5 \%6 \%7 \%8 \%9 < \v(line) > \v(line)

define sx !sx \%1 \%2 \%3 \%4 \%5 \%6 \%7 \%8 \%9 < \v(line) > \v(line)

define rx !rx \%1 \%2 \%3 \%4 \%5 \%6 \%7 \%8 \%9 < \v(line) > \v(line)

c      #connect to serial port when execute Kermit

6 u-boot configuration:

setenv baudrate 115200

setenv stdin serial

setenv stdout serial

setenv stderr serial

setenv consoledev ttyS0

setenv loads_echo 1

setenv loadaddr 200000                #RAM address

setenv loadkernaddr 1000000       #RAM address for tftp download kernel

setenv loadramdaddr 1200000     #RAM address for tftp download ramdisk

setenv kernaddr fe810000             #flash address for kernel

setenv ramdiskaddr fe9a0000       #flash address for ramdisk

setenv ramdisksize 65000              #ramdisk file system size in flash

setenv bootdrive sda1                    #boot device

setenv netdev eth0

setenv ipaddr 59.64.155.244                          #board’s netdev(eth0) ip

setenv bootdelay '3'                                         #unit: Second

setenv bootcmd 'run flashramboot'                 #default boot: from flash

setenv serverip 59.64.155.122                        #nfs server/tftp server ip

setenv rootpath '/home/kery/rootfsln'          #nfs server root direction or link

setenv tftp_path 'bootln'                                     #tftp server root direction or link

setenv netmask 255.255.255.0

setenv gatewayip 59.64.155.1

setenv setargs 'setenv bootfile \$tftp_path/uImage;setenv ramdiskfile \$tftp_path/rootfs.ext2.gz.uboot;'

setenv setnfsargs 'setenv bootargs root=/dev/nfs rw

nfsroot=$serverip:$rootpath ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname:$netdev:off

console=$consoledev,$baudrate $othbootargs' 

setenv tftpnfsboot  'run setargs;run setnfsargs;tftp $loadkernaddr $bootfile;bootm $loadkernaddr'

setenv tftpramboot 'run setargs;run setramargs;tftp $loadkernaddr $bootfile;tftp $loadramdaddr $ramdiskfile;bootm $loadkernaddr $loadramdaddr'

setenv setenv1 'setenv rootpath /home/kery/rootfs;setenv ipaddr 59.64.155.244;setenv ethaddr 08:00:3e:03:01:10;setenv eth1addr 08:00:3e:03:01:11;setenv eth2addr 08:00:3e:03:01:12'

saveenv