Motorola MPC5200 - Manual (Page 13)

KwikNet MPC5200 FEC Device Driver KADAK 7
6. Special Considerations
6.1 BestComm Initialization
The KwikNet MPC5200 FEC Ethernet Device Driver depends upon the BestComm API
and microcode supplied by Freescale Semiconductor, Inc.
The BestComm microcode must be loaded into memory and initialized once prior to
initialization of any of the subsystems that it supports. Each subsystem, such as the FEC,
must then start and assume control of the BestComm tasks upon which the subsystem
depends.
Initialization of the BestComm firmware presents the system designer with some difficult
startup issues. A number of different parts of an application will depend upon the
BestComm firmware. Each part must initialize the BestComm firmware properly for use
by that part. The
KwikNet MPC5200 FEC Ethernet Device Driver is one such part. And
yet the BestComm microcode must be loaded and initialized only once.
You, as the system designer, must ultimately bear responsibility for loading and
initializing the BestComm firmware to meet the needs of all parts of your application
which depend upon BestComm services.
A BestComm initialization procedure kn_BestCommSetup() is provided with this device
driver in source file KN5200BC.C . This procedure must be called once, and only once, by
your application as it starts up. It must be called before KwikNet procedure kn_enter() is
called to launch KwikNet .
In a multitasking system, procedure kn_BestCommSetup() must be called from an
application task. In a single threaded system, it must be called from your KwikNet App-
Task executing in the user domain.
Procedure kn_BestCommSetup() handles the relocatable loading of the BestComm
firmware image into system memory. It then initializes the BestComm API, microcode
and private Task Table for subsequent use by the
KwikNet MPC5200 FEC Ethernet
Device Driver.
You are free to edit source file KN5200BC.C to adapt the BestComm firmware loading and
initialization sequence to your particular needs. Alternatively, you can merge the code
from module
KN5200BC.C into your own BestComm initialization module.
Note
The BestComm firmware must be loaded and initialized
once, and only once, by your application software.