1.1.6 build fails on FC30

[Udo van den Heuvel]

On 03-11-2019 14:36, Achim Gratz via devel wrote:
> configuration, like so:
> 
> CONFIG_NO_HZ_COMMON=y
> CONFIG_NO_HZ_IDLE=y
> # CONFIG_NO_HZ_FULL is not set
> CONFIG_NO_HZ=y

I do not understand why NO_HZ is necessary or even usable without
conflict witgh PPS such as CONFIG_NO_HZ_COMMON.


> CONFIG_PPS=y
> # CONFIG_PPS_DEBUG is not set
> # PPS clients support
> # CONFIG_PPS_CLIENT_KTIMER is not set
> CONFIG_PPS_CLIENT_LDISC=m
> CONFIG_PPS_CLIENT_PARPORT=m
> CONFIG_PPS_CLIENT_GPIO=m
> # PPS generators support

Except for the GPIO client that is what is  in use here.

> Once you have that working correctly you can try to enable hardpps, 

How?
>> Yet we still see:
>> REFCLOCK: refclock_ppsapi: time_pps_create: Operation not supported
> 
> So does the PPS device exist and does it generate events?  


# ppstest /dev/pps0
trying PPS source "/dev/pps0"
found PPS source "/dev/pps0"
ok, found 1 source(s), now start fetching data...
source 0 - assert 1572791560.772062581, sequence: 62 - clear
1572791559.972049895, sequence: 62
source 0 - assert 1572791560.772062581, sequence: 62 - clear
1572791560.972135103, sequence: 63
source 0 - assert 1572791561.772070058, sequence: 63 - clear
1572791560.972135103, sequence: 63
source 0 - assert 1572791561.772070058, sequence: 63 - clear
1572791561.972073160, sequence: 64
source 0 - assert 1572791562.772077047, sequence: 64 - clear
1572791561.972073160, sequence: 64
source 0 - assert 1572791562.772077047, sequence: 64 - clear
1572791562.972080079, sequence: 65
source 0 - assert 1572791563.772082569, sequence: 65 - clear
1572791562.972080079, sequence: 65

> If it's
> coming in via a serial device, have you started an ldattach to enable
> the PPS line discipline?  

Yes, that makes the /dev/pps0 device appear.
We start ntpd after this step.

If it is a link to the actual device (as usual
> /dev/gpspps0 -> /dev/pps0), does it point to the correct device?  Are
> the permissions on the device correct?

Sure, in the chroot (!) the devices (created with mknod) are owned by ntp:

# ls -l /chroot/ntpd/dev/
total 0
lrwxrwxrwx 1 root root       5 Mar  9  2018 gps0 -> ttyS0
lrwxrwxrwx 1 root root       4 Mar  9  2018 gpspps0 -> pps0
srw-rw-rw- 1 root root       0 Nov  3 13:29 log
crw-r--r-- 1 ntp  ntp    1,  3 Mar  9  2018 null
crw-r--r-- 1 ntp  ntp  252,  0 Mar  9  2018 pps0
crw-r--r-- 1 ntp  ntp    4, 64 Mar  9  2018 ttyS0

If I run ntpd outside of the chroot the error dopes not appear and PPS
works.

So we take another look at the chroot...


Udo