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Mobile WiMAX Outdoor RAS SPI-2210 System Description/Ed.05

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-2210. Loading the outdoor SPI-2210 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-2210 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-2210 does not receive the remote loading.

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-2210 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-2210, 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. The DPSA,

which uses the Intel CPU, loads the kernel and the RFS from the Disk On Chip (DOC)

to the RAM Disk via ROM BIOS booting and performs the kernel.

 IP configuration: The IP address information is obtained and configured from the flash

ROM to allow it to communicate with the first upper management system.

For automatic initialization, the outdoor SPI-2210 automatically obtains the L3

information needed for communication, 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: 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 for each board.