Filter
Top Products
Booting Vmux-2100 B-1
Appendix B
Boot Manager and Software
Downloading
B.1 Introduction
This chapter describes the Vmux-2100 boot software and provides instructions for
software downloading via XMODEM or TFTP applications.
The Vmux-2100 software is stored in the Flash memory in two sections: boot and
file system. The boot sector holds a boot program that calls up the rest of the
program from the files system.
The file system can hold two compressed copies of the Vmux-2100 application
software. One copy is referred to as active partition (usually partition 1), the other
– as backup partition (usually partition 0). The active partition is decompressed
and loaded into the Vmux-2100 RAM upon power-up. The backup file is used
whenever the active file is missing or corrupted.
B.2 Booting Vmux-2100
Vmux-2100 boots up automatically. After power-up, no user intervention is
required, except when the user wants to access the file system to modify or update
the Vmux-2100 application software.
Boot Sequence
The following is a description of the boot sequence. If the system is working
normally, the entire process is completed within two minutes.
1. The boot program searches for the active partition in the file system. If the file
exists, the program continues.
If the file does not exist, the boot program searches for the backup file. If the
backup is found, it is used instead of the active partition, and the boot process
continues.
If there is no backup file, you must download a file via the XMODEM protocol.
The received file is saved as the active file in the file system.
2. Active and backup partitions are compressed and automatically decompressed
into the RAM before execution begins.
3. After decompression, the Vmux-2100 software starts to execute and the user
can begin working.