3-16
Debugger General Information
3
Device Probe Function
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
BH
,
BO
,
IOC
,
IOP
,
IOT
,
MAR
, and
MAW
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 ‘‘device present and unknown’’. 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 ‘‘device present’’ status
(pointer to the device descriptor).
Disk I/O via 162Bug Commands
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.
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.
Содержание 700 Series
Страница 2: ......
Страница 3: ...700 800 Series MVME162LX Embedded Controller Installation and Use V162 7A IH1 ...
Страница 48: ...1 34 Board Level Hardware Description 1 ...
Страница 70: ...2 22 Hardware Preparation and Installation 2 ...
Страница 138: ...A 18 Configure and Environment Commands A ...
Страница 144: ...B 6 Disk Tape Controller Data B ...
Страница 146: ...C 2 Network Controller Data C ...
Страница 156: ...Index IN 6 I N D E X W watchdog timer 1 24 Z Z85230 serial communications controllers SCCs 3 6 ...