BMEP585040模塊,SCHNEIDER怎么使用
BOOTP協(xié)議模塊引導協(xié)議（BOOTP）基本上允許無(wú)盤(pán)客戶(hù)端機器發(fā)現自己的IP地址，服務(wù)器主機的地址，以及要加載到內存并執行的文件的名稱(chēng)。
TFTP協(xié)議模塊普通文件傳輸協(xié)議（TFTP）是一種用于傳輸文件。它是在互聯(lián)網(wǎng)用戶(hù)之上實(shí)現的
數據報協(xié)議（UDP或數據報），因此可用于移動(dòng)實(shí)現UDP的不同網(wǎng)絡(luò )上的機器之間的文件。
它唯一能做的就是從遠程設備讀寫(xiě)文件服務(wù)器網(wǎng)絡(luò )引導控制模塊網(wǎng)絡(luò )引導控制模塊的“控制”能力是需要將所有必要的模塊連接在一起并按順序排列引導過(guò)程。
BMEP585040模塊引導序列包括兩個(gè)階段：第一階段標記為“地址確定和引導文件”第二階段標記為“文件傳輸”階段將利用RARP/BOOTP能力和第二階段階段將利用TFTP能力。網(wǎng)絡(luò )輸入/輸出錯誤代碼187Bug返回錯誤代碼，如果嘗試的網(wǎng)絡(luò )操作不成功的多處理器支持MVME187雙端口RAM功能使共享RAM
可用于遠程處理器和本地處理器。這可以通過(guò)以下兩種方法之一完成：
? 多處理機控制寄存器（MPCR）方法
? 全局控制和狀態(tài)寄存器（GCSR）方法
兩種方法都可以通過(guò)ENV命令啟用/禁用，如下所示：其遠程啟動(dòng)開(kāi)關(guān)方法（參考附錄A）。
多處理機控制寄存器（MPCR）方法遠程處理器可以在本地啟動(dòng)程序執行
通過(guò)發(fā)出遠程GO命令，MVME187雙端口RAM使用多處理器控制寄存器（MPCR）。
MPCR位于3000美元的共享RAM位置，與調試器加載它的基址，包含兩個(gè)字中的一個(gè)
用于控制處理器之間的通信。MPCR內容組織如下
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
