Am 10.02.2016 um 15:41 schrieb Willy Verbiest:
> Hi,
> I use a DS9490R USB adaptor to connect to the 1-wire cabeling.
> With the new Debian 8 “Jessie” distribution with owfs version 2,9p8-6
>
Debian Jessie has Linux-3.16 and the default package configuration for
owfs makes it use the w1 kernel subsystem. Unfortunately, just in
Linux-3.16 something in the w1 kernel subsystem changed and made all
owfs versions before 3.1p1 stop working correctly. Random errors.
So either:
* upgrade to owfs-3.1p1
* downgrade to linux-3.15 or earlier
* unload/blacklist the w1 kernel host adapter module (ds2490 in your
case) and change the owfs configuration to use -u instead of --w1.
>
> I did not have this error in the Debian 7 “Wheezy” distribution with owfs
> version 2.8p15.
>
Most likely because wheezy has Linux-3.2.
> And I installed owfs version 3.1p1 from the Debian 9 “Stretch” distribution
>
Ah, fine.
> After rebooting I had the same error losing the DS2423 modules.
> The hardware was not changed, putting the old SD card with Debian 7 Wheezy
> back in the Raspberry pi and the DS2423 modules works fine.
>
Please check whether the ds2423 kernel module is loaded. it may
interfere with owfs' own DS2423 transactions, even when --w1 is not used.
Then, please stop all the ow daemons (check with ps aux|grep ow) and
start owserver with debugging by hand:
# owserver --debug -u
Then, in another terminal, do a bus scan:
$ owget /uncached
> Is this a known problem?
>
It has been a while since I tested my DS2423 based modules but I just
checked with owfs-3.1p1 and -u and it works. Kernel modules
blacklisted+unloaded.
(But I remember someone having just the same problem a year ago or so.
It was related to the ds2423 kernel module IIRC.)
Kind regards
Jan
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