[LinuxPPS] pps0/1 have same major/minor as device mapper
Folkert van Heusden
folkert at vanheusden.com
Sun Jan 13 23:48:46 CET 2008
It seems to be an atom driver problem as the nmea driver seems to work
just fine:
...
PPS event on source 0 at 1200264467.1791066
capture assert seq #43 for source 0
PPS event on source 0 at 1200264467.101800514
capture clear seq #43 for source 0
PPS event on source 0 at 1200264468.1795362
capture assert seq #44 for source 0
PPS event on source 0 at 1200264468.101825608
...
On Sun, Jan 13, 2008 at 10:41:10PM +0100, Folkert van Heusden wrote:
> Ok it is definately a problem. Well, I think that it is :-)
> PPS with debugging, dmesg
> Linux version 2.6.23.pps-nodeb-debug (root at belle) (gcc version 4.2.3 20071123 (prerelease) (Debian 4.2.2-4)) #1 SMP Sun Jan 13 22:01:33 CET 2008
> LinuxPPS API ver. 1 registered
> new PPS source serial1 at ID 0
> PPS_GETCAP: source 0
> PPS_SETPARAMS: source 0
> PPS_GETCAP: source 0
> PPS_SETPARAMS: source 0
> PPS_FETCH: source 0
> timeout 0.000000000
> PPS_FETCH: source 0
> timeout 0.000000000
> PPS_FETCH: source 0
> timeout 0.000000000
> PPS_FETCH: source 0
> timeout 0.000000000
> PPS_FETCH: source 0
> timeout 0.000000000
> PPS_FETCH: source 0
> timeout 0.000000000
>
> belle:/home/folkert# lsof -n | grep ntp | grep dev
> ntpd 3866 root 0u CHR 1,3 488 /dev/null
> ntpd 3866 root 1u CHR 1,3 488 /dev/null
> ntpd 3866 root 2u CHR 1,3 488 /dev/null
> ntpd 3866 root 6u CHR 254,0 7093 /dev/pps0
> ntpd 3866 root 7u CHR 4,66 6649 /dev/ttyS2
>
> belle:/usr/src/linux-2.6-2.6.23/Documentation/pps# ppstest /dev/pps0
> trying PPS source "/dev/pps0"
> found PPS source "/dev/pps0"
> ok, found 1 source(s), now start fetching data...
> time_pps_fetch() error -1 (Connection timed out)
> time_pps_fetch() error -1 (Connection timed out)
> time_pps_fetch() error -1 (Connection timed out)
> time_pps_fetch() error -1 (Connection timed out)
>
>
>
>
> Just to see if PPS worked at all I also tried ktimer(!!!):
> belle:/usr/src/linux-2.6-2.6.23/Documentation/pps# ./ppstest /dev/pps1
> trying PPS source "/dev/pps1"
> found PPS source "/dev/pps1"
> ok, found 1 source(s), now start fetching data...
> source 0 - assert 1200260433.344696101, sequence: 21 - clear 0.000000000, sequence: 0
> source 0 - assert 1200260434.344696568, sequence: 22 - clear 0.000000000, sequence: 0
> source 0 - assert 1200260435.344711165, sequence: 23 - clear 0.000000000, sequence: 0
> SO KTIMER WORKS
>
> On Sun, Jan 13, 2008 at 09:11:55PM +0100, Folkert van Heusden wrote:
> > Just finished installing a 2.6.23 kernel with the
> > ntp-pps-2.6.23-quater.diff patch. Now the /dev/pps0 device gets created!
> >
> > There's one unfortunate thing:
> > belle:/sys/class/pps/pps0# ls -l /dev/* | grep 254
> > brw-rw---- 1 root disk 254, 0 2008-01-13 21:54 /dev/dm-0
> > brw-rw---- 1 root disk 254, 1 2008-01-13 21:54 /dev/dm-1
> > ...
> > crw-rw-r-- 1 root dialout 254, 0 2008-01-13 20:54 /dev/pps0
> > crw-rw-r-- 1 root dialout 254, 1 2008-01-13 20:54 /dev/pps1
> > Does that matter?
> >
> > After 12 minutes of running still no change in ntp:
> > remote refid st t when poll reach delay offset jitter
> > ==============================================================================
> > PPS(0) .PPS. 0 l - 16 0 0.000 0.000 0.001
> > GENERIC(0) .HBG. 0 l - 64 0 0.000 0.000 0.001
> > -muur.intranet.v .DCFa. 1 u 55 64 356 0.129 -4.565 0.238
> >
> > Yes, I ran setserial hardpps en ppsctl enable for the serial device
> > behind it (/dev/ttyS1).
> >
> > Linux version 2.6.23pps-nodeb.pps-nodeb (root at belle) (gcc version 4.2.3 20071123 (prerelease) (Debian 4.2.2-4)) #1 SMP Sun Jan 13 20:25:06 CET 2008
> > LinuxPPS API ver. 1 registered
> > new PPS source serial1 at ID 0
> > new PPS source parport0 at ID 1
> > parport_pc 00:07: PPS source #1 "/dev/lp0" added
> > parport_serial 0000:05:02.0: PPS support disabled because port "/dev/lp1" is in polling mode
> >
> > /sys/class/pps/pps0:
> > total 0
> > -r--r--r-- 1 root root 4096 2008-01-13 20:56 assert
> > -r--r--r-- 1 root root 4096 2008-01-13 20:56 clear
> > -r--r--r-- 1 root root 4096 2008-01-13 20:56 dev
> > lrwxrwxrwx 1 root root 0 2008-01-13 20:54 device -> ../../../devices/pci0000:00/0000:00:1e.0/0000:05:02.0
> > -r--r--r-- 1 root root 4096 2008-01-13 20:56 echo
> > -r--r--r-- 1 root root 4096 2008-01-13 20:56 mode
> > -r--r--r-- 1 root root 4096 2008-01-13 20:56 name
> > -r--r--r-- 1 root root 4096 2008-01-13 20:56 path
> > drwxr-xr-x 2 root root 0 2008-01-13 20:56 power
> > lrwxrwxrwx 1 root root 0 2008-01-13 20:55 subsystem -> ../../../class/pps
> > -rw-r--r-- 1 root root 4096 2008-01-13 20:55 uevent
> >
> > 05:02.0 Communication controller: NetMos Technology PCI 9835 Multi-I/O Controller (rev 01)
> > Subsystem: LSI Logic / Symbios Logic 1P2S
> > Flags: medium devsel, IRQ 18
> > I/O ports at 8400 [size=8]
> > I/O ports at 8800 [size=8]
> > I/O ports at 8c00 [size=8]
> > I/O ports at 9000 [size=8]
> > I/O ports at 9400 [size=8]
> > I/O ports at 9800 [size=16]
> >
> >
> > Folkert van Heusden
> >
> > --
> > www.ishetweekend.nl
> > ----------------------------------------------------------------------
> > Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com
>
>
> Folkert van Heusden
>
> --
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Folkert van Heusden
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