Motorola 700/800-Series ユーザーズマニュアル

3-16

Debugger General Information

A device probe with entry into the device descriptor table is done 
whenever a specified device is accessed; i.e., when system calls 
.DSKRD, .DSKWR, .DSKCFIG, .DSKFMT, and .DSKCTRL, and 
debugger commands 

, 

, 

, 

, 

, 

, and 

 are 

used. 

The device probe mechanism utilizes the SCSI commands Inquiry 
and Mode Sense. If the specified controller is non-SCSI, the probe 
simply returns a status of ÔÔdevice present and unknownÕÕ. The 
device probe makes an entry into the device descriptor table with 
the pertinent data. After an entry has been made, the next time a 
probe is done it simply returns with ÔÔdevice presentÕÕ status 
(pointer to the device descriptor). 

These following 162Bug commands are provided for disk I/O. 
Detailed instructions for their use are found in the Debugging 
Package for Motorola 68K CISC CPUs User's Manual. When a 
command is issued to a particular controller LUN and device LUN, 
these LUNs are remembered by 162Bug 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 

 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. 

 creates a command packet 

from the arguments you have specified, and then invokes the 
proper system call function to carry out the operation.