user manual

Disk I/O Support

4-15

Disk I/O via 187Bug Commands

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.

IOI (Input/Output Inquiry)

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.

IOP (Physical I/O to Disk)

IOP 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.

IOT (I/O Teach)

IOT 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.

IOC (I/O Control)

IOC 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.

BO (Bootstrap Operating System)

BO reads an operating system or control program from the

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