Re: "aborting sbp2 command" expected in kernel.org FireWire maybe

On 2004-09-02, John Stoffel wrote:
> Stefan> First thing to try is to switch serialization on for sbp2.
> Didn't help me on my 2.6.8 system when I tried it.

Yes, that is commonly found by people who see these aborting
command errors under recent 2.6 variants.

> I even tried lowering the max_speed parameter as well.

This is only a workaround for devices whose link speed is not
properly detected (irrelevant for SBP-2 devices which are almost
always S400 or S800 devices) or as a last resort for electrically
noisy hardware.

> Stefan> If that does not help, replace linux-2.6/drivers/ieee1394 by
> Stefan> the trunk directory from the Subversion repo at linux1394.org.
>
> Tried that, but from what I remember this wasn't any newer than what's
> in the 2.6.8 kernel tree.

It seems to be circa 10 minor revisions behind the repo.

> Stefan> If there are still problems, remove all non-essential kernel
> Stefan> options.
>
> Heh, tough to know what's not essential sometimes!

Just make sure an old kernel can still be booted.
I had options like energy control related features, SMP, LVM, and
so forth in mind.

> Stefan> That, or the newer kernel reveals a subtle compatibility
> Stefan> problem with the device's firmware that was masked in the
> Stefan> earlier kernels. However kernel bugs are more likely.
>
> I think the Prolific chipset stinks myself. Not sure about other
> chipsets.

According to postings at this list, it seems to be independent
from the chipset. AFAIR also bridge chips with good reputation
are affected. Firmware bugs are another possible factor though.

Some Prolific based bridges are known to implement a bogus USB/
FireWire autodetection. While this is unrelated to the topic, it
is at least an indicator for sloppy product quality.

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