Znyx Networks bh5700 - Manual (Page 139)

Under normal circumstances, the booting up process follows the process outlined in Figure 6-2.
During boot up, the zmon bootloader reads the device bootstring to locate and validate the
correct application image to load. The bootstring command is in the following format:
boot : X | [] X represents the device value 0, 1 or 2
The boot process opens and uncompresses the initrd image onto the RAM disk. Then zmon
begins booting the Linux image. After Linux boots, the init process executes the
/etc/init.d/rcS script which, in turn, executes /etc/rcZ.d/rc (see Figure 9.3: Init Script
Flow)). The /etc/rcZ.d/rc script runs S* files in /etc/rcZ.d, with the start parameter. The S*
files are the switch configuration files (for example, S50layer2).
Ethernet Switch Blade User's Guide release 3.2.2j page 139
Figure 9.2: Booting up Process Flow
Bootloader examines the
bootstring in the boot
ROM
Determines
if the boot string
is dev1
Loads image
from Flash 1
to RAM
Yes
No
Boot into
zmon bootloader
No
Yes Determines
if the boot String
is dev2
Loads image
from Flash 2
to RAM
Begins
execution of
RAM image