Re: inconsistent Self-ID

On 4 Mar, Dai Yuwen wrote:
> I have a Sony DCR-TRV 38E DV. When I connect it to the
> firewire 1394 card on my PC, using dvgrab to capture vedio,
> there're endless messages saying:
> OHCI.o: inconsistent self-ID [0Xxxxxxxxx/0Xxxxxxxxx]
>
> then the system hangs. So, what does the above info mean?

Self-ID (self identification) packets are sent by all nodes
shortly after a bus reset. (A bus reset occurs for example when a
device is added or disconnected.) Either does the camera create
incorrect self-ID packets, or the cabling is defective, or the
host adapter is unable to receive them correctly. Your host
adapter VT6306 is however supported by Linux. (I own one myself
but don't use it for video apps.)

The check in ohci1394 that returns the "SelfID is inconsistent"
message simply compares the 1st half of each packet with the
second half. The standard requires that the 2nd is the binary
inverse of the 1st. That is, the packets were either defective in
the firts place or were corrupted during transmission or
reception.

But the system (the kernel at least) should not hang because of
this.

-- 
Stefan Richter
-=====-=-=-- --== --=--
http://arcgraph.de/sr/
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