Re: 1394 SPB-2 Drives

[David Brownell <david-b@pacbell.net>]

Mark --

>    So, I think part of the issue here is that the 1394 stack is going to
> have a fairly low level part that is handling the hardware part of notifying
> the system that something has happened. Above that the 1394 stack will
> probably need to let the hot plugging system know about certain device
> changes, but possibly not about all devices. Do you see this software being
> responsible when I plug in 1394 printers, cameras, speakers, home theatre
> equipment, as well as disk drives? I'm not clear...

Yes, I see that stack handling all such notifications because, as you noted,
1394 is more USB-like than SCSI-like when it comes to hotplugging.  More
different kinds of device; isochrony; and so on.  Very much in particular,
disks aren't the "typical 1394" device (I think of video :-).


Oliver --

> As there are a lot of device on a firewire bus, it probably can't use the 
> pseudo host controller hack. And shouldn't - it's a hack, which is 
> unfortunately necessary for usb.

I don't know where that came from, but notice I never said
anything about such stuff.  In fact, neither does the firewire
code I glanced at -- Initiator/Target is the terminology.


> At present hotplugging in this driver sucks and will continue to
> do so until the scsi subsystem is extended.

I didn't see any hooks to scsi in drivers/ieee1394, so this also
seems unrelated to the basic hotplug checklist I gave.  Perhaps
you're referring to a specific driver that's not in that directory
of generic 1394 code?


> Even then for configuration there's a need to further support.
> The raw news about a device is of little use. You need the information about
> partitions and other things.

Once the bus code has hotplugged a disk-style device so that a block
device driver is hooked in, then yes -- then you need partition info.

But that's pretty late in the game, and can't apply to devices like
video cameras or a VCR.

- Dave




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