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Figure 6.2: Boot Flow Chart
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 | [<options>] 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 6.3: 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 85
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