[LinuxPPS] PPS on a recent kernel

[Bernhard Schiffner]

On Sunday 18 October 2009 12:08:59 William S. Brasher wrote:
...
> > LinuxPPS mailing list
> > LinuxPPS at ml.enneenne.com
> > http://ml.enneenne.com/cgi-bin/mailman/listinfo/linuxpps
> > Wiki: http://wiki.enneenne.com/index.php/LinuxPPS_support
>
> I am using LinuxPPS with linux-2.6.31 with no perceived problems, even
> though this is very much a work in progress.
>
> Linux-2.6.31 was patched with 9 patches Rodolfo Giometti sent to
> the LinuxPPS mailing list Wednesday, September 16 2009, and may
> be found in the archives with the following subject headings:
>
>  [LinuxPPS] [PATCH 01/11] pps: userland header file for PPS API.
>  [LinuxPPS] [PATCH 02/11] pps: documentation programs and examples.
>  [LinuxPPS] [PATCH 03/11] pps: LinuxPPS clients support.
>  [LinuxPPS] [PATCH 04/11] ldisc: new dcd_change() method for line
> disciplines. [LinuxPPS] [PATCH 05/11] ldisc n_tty: export all N_TTY ldisc
> methods. [LinuxPPS] [PATCH 06/11] pps: serial clients support.
>  [LinuxPPS] [PATCH 07/11] serial 8250: enable PPS support.
>  [LinuxPPS] [PATCH 08/11] pps: parallel port clients support.
>  [LinuxPPS] [PATCH 09/11] pps: low level IRQ timestamps recording.
>
>
> I use ntp-4.2.4p7 patched with the nmea patch found on
> http://wiki.enneenne.com/index.php/LinuxPPS_NTPD_support
>
> http://ftp.enneenne.com/pub/misc/linuxpps/refclocks/nmea/nmea.patch
>
>
> I configure NTP as follows:
>  LDFLAGS=-lrt ./configure --prefix=/usr --bindir=/usr/sbin \
>     --sysconfdir=/etc --with-binsubdir=sbin \
>     --enable-shared  --with-crypto
>
> Since the routines clock_gettime and clock_settime are in librt, I add the
> LDFLAGS so configure can find them.
>
>
>
> I am using glibc-2.10.1 with linux headers taken from linux-2.6.30 that
> was patched with an earlier version of LinusPPS.  The following patch must
> be applied to ntp-4.2.4p7 in addition to the nmea.patch above inorder to
> get ntp to compile with this glibc:
>
>
> diff -Naur ntp-4.2.4p7.org/include/ntp_syscall.h
> ntp-4.2.4p7/include/ntp_syscall.h --- ntp-4.2.4p7.org/include/ntp_syscall.h
>       2004-02-24 23:57:56.000000000 -0600 +++
> ntp-4.2.4p7/include/ntp_syscall.h   2009-06-14 13:09:26.000000000 -0500 @@
> -14,6 +14,14 @@
>  # include <sys/timex.h>
>  #endif
>
> +#if defined(ADJ_NANO) && !defined(MOD_NANO)
> +#define MOD_NANO ADJ_NANO
> +#endif
> +
> +#if defined(ADJ_TAI) && !defined(MOD_TAI)
> +#define MOD_TAI ADJ_TAI
> +#endif
> +
>  #ifndef NTP_SYSCALLS_LIBC
>  #ifdef NTP_SYSCALLS_STD
>  # define ntp_adjtime(t)                syscall(SYS_ntp_adjtime, (t))

Thanks a lot for this explanation. It summarizes a lot.
(I hope I can test it soon too.)

I have the same problem wit the gitweb of Rodolfos site. I mailed him, but 
nothing changed until now. (But this can't be so difficult ...)
Do you see a chance to maintain a little git-tree with the recent patches 
yourself, until Rodolfo can continue his work?
(gitweb / gitourous comes to mind)

(I can do this myself, but my modem-connection to the internet is a real 
limitation.)

???

Bernhard