Rarp/Arp Protocol Modules; Bootp Protocol Module; Tftp Protocol Module; Network Boot Control Module - Motorola MVME162LX 300 Series Installation And Use Manual

Embedded controller

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RARP/ARP Protocol Modules

The Reverse Address Resolution Protocol (RARP) 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) provides a method of converting

protocol addresses (i.e., IP addresses) to local area network addresses (i.e.,

Ethernet addresses). The RARP protocol module supports systems which

do not support the BOOTP protocol (next paragraph).

The Bootstrap Protocol (BOOTP) 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.

The 162Bug returns an error code if an attempted network operation is

unsuccessful.

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Network I/O Support

3-19

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