User's Manual

CHAPTER 3. System Structure

3-18

Loader

Loader manages the entire process from the start of OS to the previous step of ULM

running (pre-loading). After that, if ULM is actuated after the initialization script is

executed and the registration and loading function is performed, the loader monitors the

ULM block.

Main functions are as follows:

y System time setting

Before NTP-based synchronization, the system time is set by receiving the Time of

Date (ToD) from a GPS receiver.

y SPI-2L10 registration and loading

− Registration of the SPI-2L10 to the Registration Server (RS)

− Determination of the loading method

1) Loading as the latest version via the version comparison: Loading via its own

nonvolatile storage or remote IS

2) Loading via the console port (at this time, omitting the registration of the SPI-

2L10 to the RS)

y Backing up and restoring the software image and the PLD

Loader saves the software image and the PLD of the latest version in its own

nonvolatile storage and restores it as the corresponding information when required.

(In case of PLD, back-up by operator’s command)

y ULM monitoring

Loader monitors whether the ULM block operates normally and if it is abnormal, this

restarts it.