Digi 9P 9360/9750 - Manual (Page 50)

L i n u x b o o t p r o c e s s
5 0 L x N E T E S U s e r ’ s G u i d e
If a wrong command line parameter for "console=" is used, nothing will be displayed after
"done, booting the kernel". The system may continue to boot. You may connect to the
target by Telnet after telnetd is configured .
After finishing the initialization, the filesystems are mounted and the process "/sbin/init"
is started with process ID 0. Init runs all applications stated in "/etc/inittab", e.g. "/etc/
init.d/rcS", the various daemons like telnetd and shells on the serial consoles.
Passing arguments to the kernel
Depending on the kernel settings, additional command line arguments may be given to the
kernel. This can be modified by editing the std_bootarg environment variable. For
example, to enable a console on a different serial port than the standard one when Linux
boots, add 'console=ttyS1':
Automating the image download
It is also possible to automate the boot process to always boot by network when the target
is reset. Adjust the environment variable "bootcmd" to contain the " run boottftp” script
seen before:
Don't forget "saveenv" to store your settings.
Updating the Flash memory
This chapter describes how you can update the U-Boot boot loader, the Linux kernel, and
the root file system in the Flash memory of the module.
It is strongly recommended that you test your images before updating the Flash memory
by downloading them over Ethernet using TFTP.
# setenv std_bootarg console=ttyS1
# saveenv
# setenv bootcmd run boot_net
# saveenv
If you want to store a script with several commands into a variable, separate each
command with a semicolon prefixed with a "\" to prevent ending the setenv
command itself. (i.e. setenv MyCommand cmd1\;cmd2\;cmd3)