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Appendix D - About Firmware
Gyr
90
98-1031 Rev AA
Series IV Concentrator U and I Guide
application image. Both these images reside in the flash memory of the concentrator. The application
image resides in a compressed form in the Flash memory.
During the boot-up, these image files are loaded from the Flash memory into the RAM and executed
in the RAM. The following sections describe the concentrator boot-up.
Initialization and Boot Image Loading
The boot image consists of a ROM boot image that is executed directly from Flash, and a RAM boot
image that is stored in a compressed form in flash, and executed from RAM. The ROM boot image
executes at power up and it:
1.
Executes the basic BSP initialization code to bring up the H/W.
2.
Decompresses the RAM boot image from Flash to RAM.
3.
Starts the RAM boot image.
Application Image Loading
The RAM boot image determines which application image to execute. This is based on the boot bank
configuration stored in the NVRAM/EEPROM section of the Flash memory. The RAM boot image
during its execution:
•
Identifies the appropriate application image stored in flash.
•
Decompresses the application image from Flash to RAM
•
Starts the RAM application image.
Application Image Startup
The application image initializes all the necessary device divers and brings up the NET+OS
operating system. The NET+OS operating system after completing its initialization passes on the
control to the Concentrator Application. There are two execution modes (Diagnostics and
Application) in the concentrator. The following sections describe boot-up and provide details on the
execution modes.
Concentrator Boot-Up
Normally, the NET+OS configuration option displays during the boot-up. During concentrator boot-
up, the network parameters required for configuring the TCP/IP are combined into the diagnostics