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Disk I/O Error Codes
166Bug returns an error code if an attempted disk operation is unsuccessful.
Network I/O Support
The Network Boot 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.
The various modules (capabilities) and the dependencies of these modules
that support the overall network boot function are described in the following
paragraphs.
Intel 82596 LAN Coprocessor Ethernet Driver
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.
UDP/IP Protocol Modules
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.
MVME166IG/D2
Network I/O Support
3-19
3
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