setting up target mode

[Sarnath Kannan]

Hi,

>I did not know that the commands from scanner are of a different command 
>set.

It is still SCSI. SCANNER devices have a set of exclusive opcodes apart from 
the common set of commands.

>I think, the FreeBSD is not emulating any device. The ahc_pci driver, again 
>I believe, is the driver for ahc 7xxx SCSI card. Being in target mode, this 
>driver will receive traffic from the scanner targeted to the SCSI card 
>(e.g. send to the SCSI ID that this card is using) ?

The SCSI spec accomodates variety of devices. For example, DA devices, 
Optical devices, Write-once devices etc... All of these devices share some 
set of basic commands in common. Apart from the common commands, each one of 
them have a set of commands which are specific to the device type. One such 
common command is INQUIRY. Each device will report what type of device it 
is, through this command.
On seeing the device-type, the initiator will decide what type of commands 
to send through.
I think the FreeBSD stack emulates either a PROCESSOR device OR a DA device. 
So I guess, you wont
see any SCANNER related SCSI traffic at all.  For more details, try reading 
SCSI specs. They are available from www.t10.org.

>
>As you can see, I am very new to both SCSI and FreeBSD... :)
>

Oh ! Even I am. And, therez a chance that I may b wrong. I hope that others 
will correct me if I am
wrong.
-
Sarnath

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