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Figure 18.1: ROM Devices in OpenArchitect
The boot ROM is located on device 0 and contains the OpenArchitect zmon application that
operates as a boot loader and includes a device bootstring. Device1 contains the application
flash1 image of the Linux operating system and the OpenArchitect overlay file system.
Application flash1 is the primary working image for the switch. Device 2 contains the
application flash 2 that is an exact copy of application flash 1. You would only boot from this
device if application flash1 is corrupted and you need to restore the switch to the factory-
shipped configuration.
Ethernet Switch Blade User's Guide release 3.2.2j page 190
Boot ROM
on Device 0
zmon
Free space
Offset 7f000
dev
bootstring
Application
Flash 1 on
Device 1
Offset 0
initrd
Linux and
its file
system
Free space
overlay
file system
Application
Flash 2 on
Device 2
Offset 0
initrd
(exact copy
as in
Application
Flash 1)
Linux and its
file system
Free space