Motorola MVME187 User Manual

Disk I/O Support

4-15

These following 187Bug commands are provided for disk I/O. 
Detailed instructions for their use are found in the Debugging 
Package for Motorola 88K RISC CPUs User's Manual. When a 
command is issued to a particular controller LUN and device LUN, 
these LUNs are remembered by 187Bug so that the next disk 
command defaults to use the same controller and device. 

This command is used to probe the system for all possible 
CLUN/DLUN combinations and display inquiry data for devices 
which support it. The device descriptor table only has space for 16 
device descriptors; with the IOI command, you can view the table 
and clear it if necessary. 

 allows you to read or write blocks of data, or to format the 

specified device in a certain way. IOP creates a command packet 
from the arguments you have specified, and then invokes the 
proper system call function to carry out the operation. 

 allows you to change any configurable parameters and 

attributes of the device. In addition, it allows you to see the 
controllers available in the system. 

 allows you to send command packets as defined by the 

particular controller directly. IOC can also be used to look at the 
resultant device packet after using the IOP command. 

 reads an operating system or control program from the 

specified device into memory, and then transfers control to it.