Loading Message Flow - Samsung Mobile WiMAX Outdoor RAS SPI-2331 System Description

4.4 Loading Message Flow

Loading is the procedure to download the software execution files and the data from the IS,
which are required to perform each function of each processor and each device of the outdoor
SPI-2331. Loading the outdoor SPI-2331 is performed in the procedure of initializing the
system. In addition, if a specific board is mounted on the system or the hardware is reset, or
if the operator of the upper management system reboots a specific board, loading is
performed.
Loading is classified into two types, one is loading by using its own nonvolatile storage
and the other is loading by using the remote IS. When the system is initialized for the first
time, the outdoor SPI-2331 receives the loading by using the remote IS, and after this,
saves the corresponding information in the internal storage, and backs up the recent
information periodically, and then it is available to avoid unnecessary loading. After the
first initialization, if the information saved in its own storage is the recent information by
comparing the version, the outdoor SPI-2331 does not receive the remote loading.
If it is required to perform roll-back to the previous version, or if the communication with
the remote server is not available, the function of the forced loading, which enables to
receive the loading from the remote server or from its own storage without comparing the
version, is provided when required.
The loaded information includes the software image which is configured with the execution
file and the script file, the configuration information, the PLD related to the operation
parameter and various configuration files. Among them, all the information required for the
static routing function of the outdoor SPI-2331 is saved in its own storage as the startup
configure file format, and provides the information required at the time of the initialization.
Loading Procedure
To perform the loading procedure when initializing the outdoor SPI-2331, the loader
performs the followings first.(Pre-loading)
Boot-up: The booter of the Flash ROM loads the kernel and the Root File
System(RFS) from the flash ROM to the RAM Disk, and performs the kernel.
IP configuration: The IP address information is acquired from the flash ROM and is set
to communicate with the first upper management system. For automatic initialization,
the outdoor SPI-2331 automatically receives L3 information such as the IP address,
subnet mask, and gateway IP address from DHCP. At this time, it also receives the IP
address of the additional information server, and asks for its ID and the IP address of
the RS to which its ID is registered.
Registration: The NE is registered to the RS, and the IP address of the IS is acquired
during the registration.
Version Comparison: Except for the case where forced loading is set, the version of
the software image and the version of the PLD saved in the remote IS and in the
internal storage are compared, and the location where to perform loading is
determined from that.
File List Download: The list of the files to be loaded is downloaded.
© SAMSUNG Electronics Co., Ltd.
Mobile WiMAX Outdoor RAS SPI-2331 System Description/Ed.02
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