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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 - iFLash INT FLASH only / INTRAM only Case B: netX90 - iFLASH 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 IntFlash0INT FLASH 0-1 for the COM CPU and IntFlash2 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). Once the following issue is resolved, the SPI and SPI FLASH drivers in use case A and use case B can be removed, too .

Additional Services

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

• 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).