Really strange that your settings are 0 in overdrive.0 (which means regular speed) after startup...?!?
Nice to hear that the CRC errors changed... That really looks like some cable or signal problem which should be possible to tune away with the slewrate. # ipkg upgrade Upgrading owfs on root from 2.6p5-14 to 2.6p5-15... Downloading http://owfs.sourceforge.net/nslu2/packages/./owfs_2.6p5-15_armeb.ipk Upgrading owlib on root from 2.6p5-14 to 2.6p5-15... Downloading http://owfs.sourceforge.net/nslu2/packages/./owlib_2.6p5-15_armeb.ipk Configuring owfs Configuring owlib # run-owfs Using /lib/modules/2.4.22-xfs/kernel/fs/fuse/fuse.o # cat /tmp/1wire/bus.0/system/adapter/overdrive.0 1# Note that it's set to 1 (flexible speed) for me.... and I don't understand how it could be changed just after startup. # bash bash-3.2# ls -l /tmp/1wire/uncached/ drwxrwxrwx 1 root root 8 Jul 4 23:40 10.94C7ED000800 drwxrwxrwx 1 root root 8 Jul 4 23:40 37.11A401000000 drwxrwxrwx 1 root root 8 Jul 4 23:40 81.465723000000 drwxr-xr-x 1 root root 8 Jul 4 23:39 alarm drwxr-xr-x 1 root root 8 Jul 4 23:39 bus.0 drwxrwxrwx 1 root root 8 Jul 4 23:40 simultaneous bash-3.2# echo 2 > /tmp/1wire/bus.0/system/adapter/overdrive.0 bash-3.2# ls -l /tmp/1wire/uncached/ drwxrwxrwx 1 root root 8 Jul 4 23:40 37.11A401000000 drwxrwxrwx 1 root root 8 Jul 4 23:40 81.465723000000 drwxr-xr-x 1 root root 8 Jul 4 23:39 bus.0 (the ds1920 disappears since it doesn't support overdrive) bash-3.2# echo 1 > /tmp/1wire/bus.0/system/adapter/overdrive.0 bash-3.2# ls -l /tmp/1wire/uncached/ drwxrwxrwx 1 root root 8 Jul 4 23:40 10.94C7ED000800 drwxrwxrwx 1 root root 8 Jul 4 23:40 37.11A401000000 drwxrwxrwx 1 root root 8 Jul 4 23:40 81.465723000000 drwxr-xr-x 1 root root 8 Jul 4 23:39 alarm drwxr-xr-x 1 root root 8 Jul 4 23:39 bus.0 drwxrwxrwx 1 root root 8 Jul 4 23:40 simultaneous bash-3.2# (the ds1920 is back in flexible speed) bash-3.2# cat /tmp/1wire/bus.0/system/adapter/pulldownslewrate.0 5 In this case slewrate is 5 (which is 0.83V/us). Read in owlib/src/c/ow_ds9490.c for more info. Starting owserver without --altUSB option is the same as setting: bash-3.2# echo 1 > /tmp/1wire/bus.0/system/adapter/overdrive.0 bash-3.2# echo 5 > /tmp/1wire/bus.0/system/adapter/pulldownslewrate.0 bash-3.2# echo 4 > /tmp/1wire/bus.0/system/adapter/writeonelowtime.0 bash-3.2# echo 4 > /tmp/1wire/bus.0/system/adapter/datasampleoffset.0 Starting owserver WITH --altUSB option is the same as setting: bash-3.2# echo 1 > /tmp/1wire/bus.0/system/adapter/overdrive.0 bash-3.2# echo 3 > /tmp/1wire/bus.0/system/adapter/pulldownslewrate.0 bash-3.2# echo 2 > /tmp/1wire/bus.0/system/adapter/writeonelowtime.0 bash-3.2# echo 5 > /tmp/1wire/bus.0/system/adapter/datasampleoffset.0 (This setting have been reported to work for some AAG user before) /Christian > Christian, > after the installation of 2.65-15 version of owfs, i checked the value > of > /tmp/1wire/bus.0/system/adapter/overdrive.0 and i found a 0 (zero) > there. > Reading your posting i understand that, to be able to change the slew > param, i > must put a 1 on the overdrive.0 parameter. > I issued a echo 1 > /tmp/1wire/bus.0/system/adapter/overdrive.0 and > then i start > tweeking the /tmp/1wire/bus.0/system/adapter/pulldownslewrate.0 > parameter > ranging from 0 up to 7. > The problem is still there but the errors are changed . > The output of grep -v " 0" /tmp/1wire/bus.0/statistics/errors/* is now > : > > /tmp/1wire/bus.0/statistics/errors/BUS_select_low_errors: 24 > /tmp/1wire/bus.0/statistics/errors/CRC8_tries: 5 > > Actually i am tweeking even the other parameter you indicated in a > previous > posting : writeonelowtime.0 and datasampleoffset.0, i don't see any > difference > on the behaviour of the NSLU2. > > I don't know if it make sense, i made the same test with > /tmp/1wire/bus.0/system/adapter/overdrive.0 set to 0 and 2 with the > same results > as before. > > Just a little remark: as said before , my network is composed by just > two > devices, the Bus master and the 2408 board. The twos are connected via > a short > (no more than 30 cm) rj45 cable. > Regards > Giuliano ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
