Re: Bus Reset Observations

[Olivier D. <dai...@el...>]

I forgot to say...

If the cable is connected to both computers and I load ieee1394 modules on the
machines, the load of modules generates a "soft" reset on the bus and SelfID
always complete successfully.

Olivier

Mark Knecht wrote:

> Hi,
>    I don't know whether to report this as a stack problem or a gscanbus
> problem. (I think stack...) I am seeing a very specific and repeatable
> problem. To me, at a high level, this looks like incorrect operation at the
> stack level. On my systems I believe that when the Linux based PC is not
> connected to any 1394 devices, and a cable to a 1394 device is inserted into
> the OHCI card, the 1394 stack does not recognize a cable insertion.
>
>    Can someone verify whether they are seeing or not seeing the same
> results?
>
> Thanks,
> Mark
>
>
> TESTS......
>
>    I have set up 3 PCs with RH 6.2, downloaded the 2.2.15 kernel, built it
> first with the patch, and then with the CVS tree. I have downloaded and
> installed 1394libraw from the CVS tree and installed that. I have downloaded
> gscanbus and am running it on all three PCs. Messages in /var/log look
> pretty reasonable based on how many devices are on the bus. I can set up a
> network with the 3 PCs and a few other peripherals, and sometimes get
> gscanbus to correctly see the topology identically on all three machines.
> (And sometimes not!)
>
>    For gscanbus I built a guid-resolv.conf file with the GUIDs of each PC
> and put the same file on all three PCs.
>
> ***** Test 1 *****
>
> Connect 2 PCs and a Sony CD drive. Start gscanbus.
>
> Observations:
> I see 2 PCs and one unknown device.
> If I pull the cable on the drive, I see 2 PCs. (Bus Reset detected)
> If I insert the cable, the unknown device comes back. (Bus Reset Detected)
> If I power off the drive, the unknown device disappears. (Bus Reset
> Detected)
> If I power the drive back up, the unknown device reappears. (Bus Reset
> Detected)
>
> *****************
>
> ***** Test 2 *****
>
> Connect 1 PC and the Sony CD drive. Start gscanbus.
>
> Observations:
>
> I see 1 PC and one unknown device.
> If I pull the cable, I see 1 PC. (Bus reset detected)
>
> If I insert the drive cable, the drive does not come back. (Bus Reset is not
> detected)
>
> If I power off the drive, no change in the screen, because the screen is
> incorrect right now. (Bus Reset Detected)
> If I power the drive back up, then unknown device reappears. (Bus Reset
> Detected)
>
>
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--
Olivier Daigle
Projet Harfang
(514) 396-8800 ext.7699