Use Cases

Three general "Use Cases" are defined when using a netX hardware and must be handled by the maintenance firmware:

• Case A: netX90 minimal - INT FLASH only / INTRAM only
• Case B: netX90 - INT FLASH / INTRAM + SQI Flash (for APP CPU / MFW)
• Case C: netX90 / netX4000 + SQI Flash + SDRAM

Supported Drivers

The following drivers are used by the maintenance firmware for the different use cases.

Driver	netX90			netX4000	Description
	A	B	C	C
INT FLASH					For access to INT FLASH 0-1 for the COM CPU and INT FLASH 2 for APP CPU updates.
SPI					For access to the external SPI flash.
SPI FLASH					For access to the external SPI flash.
Serial					Communication with maintenance firmware (downloading/starting update).
USB					Communication with maintenance firmware (downloading/starting update).
DPM					Communication with maintenance firmware (downloading/starting update).

Additional Services

In addition to the drivers, the maintenance firmware must also provide standard services necessary for external applications.

• Flash device Label
  Device specific infomation, including firmware update areas or file system information

• Device Data Provider (DDP)
  The DDP is used to retrieve information like hardware compatibility or locations of FLASH areas from the FDL.

• Marshaller (Diagnostics interface)
  For the communication between Host and netX the Marshaller is used in the following configuration.

• Middleware packet handling
  For file related packet handling it has to be distinguished between FLASH and filesystem area and between (regular) loadable firmware (LFW) and the maintenance firmware (MFW).