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port-sparc64/49655: PPS_SYNC option not supported on sab driver for Sun Ultra 5 serial ports (sparc64)

>Number:         49655
>Category:       port-sparc64
>Synopsis:       PPS_SYNC option not supported on sab driver for Sun Ultra 5 serial ports (sparc64)
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-sparc64-maintainer
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 10 19:35:00 +0000 2015
>Originator:     Arun Venkataraman
>Release:        6.1.5
Arecibo Observatory
NetBSD netbsd0 6.1.5 NetBSD 6.1.5 (netbsd0) #1: Tue Feb 10 01:15:10 UTC 2015  root@netbsd0:/usr/src/sys/arch/sparc64/compile/netbsd0 sparc64

Sun Ultra 5 serial ports are attached via the sab(4) driver (Infineon 82532 Enhanced Serial Communication Controller). This driver currently does not provide the PPS_SYNC option enabling a kernel serial line discipline for external reference clocks. NetBSD currently supports the PPS_SYNC option in com(4) and zsc(4) neither of which are available on the Ultra5, limiting accuracy of NTP time.  Attempt to use the NTP4 daemon with a PPS refclock is rejected with "Interrupted system call".  The pps-api utility packaged with ntp-4.2.8 returns for /dev/ttyh1 or /dev/dtyh1:
 pps-api: time_pps_getcap: Inappropriate ioctl for device

Request adding PPS_SYNC support in the sab driver.

Fetch and build current net/ntp4 via pkgsrc
Use a NetBSD kernel with NTP and PPS_SYNC options compiled in
Create PPSAPI devices for NTP ( /dev/pps1 -> /dev/ttyh1 )
Add a PPS peer in ntp.conf (refclock driver
(Re)start NTP daemon
Build and run the ntp-4.2.8/util/pps-api diagnostic to detect PPS signals.

Request adding PPS line discipline support in sab(4) preferably via CD pin as specified in the PPSAPI RFC.

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