Znyx Networks bh5700 - Manual (Page 138)

Chapter 9 Base Switch Maintenance
This chapter includes basic information about the OpenArchitect switch environment including
an overview of the file system structure, modifying and updating switch files, upgrading the
switch driver and kernel, and implementing a system recovery.
Overview of the OpenArchitect switch boot process
The OpenArchitect switch is equipped with a Random Access Memory (RAM) disk and three
Read Only Memory (ROM) devices, including, a boot ROM and two application flash
Figure 9.1: 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. Device 1 contains the application
flash 1 image of the Linux operating system and the OpenArchitect overlay file system.
Application flash 1 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 flash 1 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 138
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