Motorola MVME162 User Manual

Network I/O Support

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162Bug returns an error code if an attempted disk operation is unsuccessful.

The Network Boot Firmware provides the capability to boot the CPU through 
the Flash/PROM debugger using a network (local Ethernet interface) as the 
boot device.

The booting process is executed in two distinct phases.

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The first phase allows the diskless remote node to discover its network 
identify and the name of the file to be booted.

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The second phase has the diskless remote node reading the boot file across 
the network into its memory.

The various modules (capabilities) and the dependencies of these modules 
that support the overall network boot function are described in the following 
paragraphs.

This driver manages/surrounds the Intel 82596 LAN Coprocessor. 
Management is in the scope of the reception of packets, the transmission of 
packets, receive buffer flushing, and interface initialization.

This module ensures that the packaging and unpackaging of Ethernet packets 
is done correctly in the Boot PROM.

The Internet Protocol (IP) is designed for use in interconnected systems of 
packet-switched computer communication networks. The Internet protocol 
provides for transmitting of blocks of data called datagrams (hence User 
Datagram Protocol, or UDP) from sources to destinations, where sources and 
destinations are hosts identified by fixed length addresses.

The UDP/IP protocols are necessary for the TFTP and BOOTP protocols; TFTP 
and BOOTP require a UDP/IP connection.