Motorola MVME2600 Series User Manual Page 46

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Network I/O Support
1-28
1
Network I/O Support
The network autoboot firmware provides the capability to boot the
CPU through the ROM debugger using a network (local Ethernet
interface) as the boot device.
The booting process is executed in two distinct phases.
The first phase allows the diskless remote node to discover its
network identify and the name of the file to be booted.
The second phase has the diskless remote node reading the
boot file across the network into its memory.
Figure 1-1 depicts the various modules (capabilities) and the
dependencies of these modules that support the overall network
boot function. They are described in the following paragraphs.
Physical Layer Manager Ethernet Driver
This driver surrounds and manages the Ethernet controller chip or
module. Management includes the reception of packets, the
transmission of packets, flushing of the receive buffer, and interface
initialization.
This module ensures that the packaging and unpackaging of
Ethernet packets is done correctly in the Boot PROM.
UDP and IP Modules
The Internet Protocol (IP) is designed for use in interconnected
systems of packet-switched computer communication networks.
The Internet Protocol provides for transmitting 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 and IP protocols are necessary for the TFTP and BOOTP
protocols; TFTP and BOOTP require a UDP/IP connection.
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