Motorola MVME166IG 用户手册

Debugger General Information

3-20

The Reverse Address Resolution Protocol (RARP) basically consists of an 
identity-less node broadcasting a "whoami" packet onto the Ethernet, and 
waiting for an answer. The RARP server fills an Ethernet reply packet up with 
the target’s Internet Address and sends it.  

The Address Resolution Protocol (ARP) basically provides a method of 
converting protocol addresses (e.g., IP addresses) to local area network 
addresses (e.g., Ethernet addresses).  The RARP protocol module supports 
systems which do not support the BOOTP protocol (next paragraph).  

The Bootstrap Protocol (BOOTP) basically allows a diskless client machine to 
discover its own IP address, the address of a server host, and the name of a file 
to be loaded into memory and executed.  

The Trivial File Transfer Protocol (TFTP) is a simple protocol to transfer files.  
It is implemented on top of the Internet User Datagram Protocol (UDP or 
Datagram) so it may be used to move files between machines on different 
networks implementing UDP. The only thing it can do is read and write files 
from/to a remote server.  

The "control" capability  of the Network Boot Control Module is needed to tie 
together all the necessary modules (capabilities) and to sequence the booting 
process. The booting sequence consists of two phases: the first phase is labeled 
"address determination and bootfile selection" and the second phase is labeled 
"file transfer". The first phase will utilize the RARP/BOOTP capability and the 
second phase will utilize the TFTP capability.  

166Bug returns an error code if an attempted network operation is 
unsuccessful.