BMEP585040模块,SCHNEIDER怎么使用
BOOTP协议模块引导协议（BOOTP）基本上允许无盘客户端机器发现自己的IP地址，服务器主机的地址，以及要加载到内存并执行的文件的名称。
TFTP协议模块普通文件传输协议（TFTP）是一种用于传输文件。它是在互联网用户之上实现的
数据报协议（UDP或数据报），因此可用于移动实现UDP的不同网络上的机器之间的文件。
它唯一能做的就是从远程设备读写文件服务器网络引导控制模块网络引导控制模块的“控制”能力是需要将所有必要的模块连接在一起并按顺序排列引导过程。
BMEP585040模块引导序列包括两个阶段：第一阶段标记为“地址确定和引导文件”第二阶段标记为“文件传输”阶段将利用RARP/BOOTP能力和第二阶段阶段将利用TFTP能力。网络输入/输出错误代码187Bug返回错误代码，如果尝试的网络操作不成功的多处理器支持MVME187双端口RAM功能使共享RAM
可用于远程处理器和本地处理器。这可以通过以下两种方法之一完成：
❏ 多处理机控制寄存器（MPCR）方法
❏ 全局控制和状态寄存器（GCSR）方法
两种方法都可以通过ENV命令启用/禁用，如下所示：其远程启动开关方法（参考附录A）。
多处理机控制寄存器（MPCR）方法远程处理器可以在本地启动程序执行
通过发出远程GO命令，MVME187双端口RAM使用多处理器控制寄存器（MPCR）。
MPCR位于3000美元的共享RAM位置，与调试器加载它的基址，包含两个字中的一个
用于控制处理器之间的通信。MPCR内容组织如下
BOOTP Protocol Module
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.
TFTP Protocol Module
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.
Network Boot Control Module
The "control" capability of the Network Boot Control Module is
needed to tie together all the necessary modules 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. Network I/O Error Codes
187Bug returns an error code if an attempted network operation is
unsuccessful.
Multiprocessor Support
The MVME187 dual-port RAM feature makes the shared RAM
available to remote processors as well as to the local processor. This
can be done by either of the following two methods:
❏ The Multiprocessor Control Register (MPCR) Method
❏ The Global Control and Status Register (GCSR) Method
Either method can be enabled/disabled by the ENV command as
its Remote Start Switch Method (refer to Appendix A).
Multiprocessor Control Register (MPCR) Method
A remote processor can initiate program execution in the local
MVME187 dual-port RAM by issuing a remote GO command
using the Multiprocessor Control Register (MPCR).
The MPCR, located at shared RAM location of $3000 offset from the
base address the debugger loads it at, contains one of two words
used to control communication between processors. The MPCR
contents are organized as follows
