[LinuxPPS] [alpha PATCH] Low level IRQ support.

[Udo van den Heuvel]

Rodolfo Giometti wrote:
> here my proposal for the low level IRQ support.

Thanks very much! That was quick.

> Currently I've no hardware to test it so please do it by yourself and
> report results.

The patch applies well to 2.6.25.1.
It compiles fine.

> I've added the new configuration option "Use low level IRQ
> timestamps", I'd like to know differences between using or not using
> it!

My reception is not very good but I can at least do some basic tests.

ntpd appears to work, shortly after startup:

# ntpq -pn
     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
 127.127.1.0     .LOCL.          15 l   40   64    1    0.000    0.000
 0.001
*127.127.20.0    .GPS.           14 l    6   16   37    0.000    4.747
 2.506
 127.127.22.0    .PPS.            0 l    5   16    3    0.000    4.788
 0.632
 194.109.22.18   193.79.237.14    2 u   48   64    1    8.125    4.224
 0.001

# grep PPS .config
# PPS support
CONFIG_PPS=y
CONFIG_PPS_IRQ_EVENTS=y
# CONFIG_PPS_DEBUG is not set
# PPS clients support
CONFIG_PPS_CLIENT_KTIMER=m
CONFIG_PPS_CLIENT_UART=y
# CONFIG_PPS_CLIENT_LP is not set


If you have suggestions to (better) compare old and new behaviour,
please let me know.

Kind regards,
Udo