[ntp:questions] Re: Symmetricon bc635PCI-U
hundoj at comcast.net
Thu May 25 18:58:57 UTC 2006
u... at domain.invalid wrote:
> Further to my previous, the core issue is a PCI driver that maps the
> device registers where the NTP driver can find them. Once that is
> available, the NTP driver code is a 15-minute exercise with
> sscanf/springf as you can see in the KSI code. So, what does Symmetricom
> have as PCI driver? Surely they have one for Linux.
> David L. Mills wrote:
> > Greg,
> > True, we have tried to throttle back new drivers in favor of
> > generalizing existing ones. However, the KSI/Odetics driver is very
> > similar to the ex-TrueTime 560, which in turn is very similar to the
> > ex-Bancomm bc635/7. The KSI is certainly toast, as is the old Sun SBus,
> > so can be deprecated. So far as I know, the 560 was discontinued when
> > Symmetricom ate TrueTime, but there are a few 560s still around (I have
> > one). Best choice would be a driver that supports both the 560 and
> > 635/7. If sufficient steam is not available to support the 560, send us
> > a 635/7 driver to replace the KSI driver.
> > Dave
> > Greg Dowd wrote:
> >> There have been a few implementations of a refclock driver for the
> >> bc635/637PCI cards. (-U indicates universal signaling for pci, 635 is
> >> the base model type and 637 indicates gps version). There has also
> >> been a strong pushback for years now against allowing a new driver
> >> into the distribution. To be honest, I'm not sure what's out there
> >> now but I don't see one in the list. Having said that, if you don't
> >> hear otherwise, I'll make you one but I don't know if it will be
> >> maintained in the ntp distro.
> >> Message: 1
> >> Date: Mon, 15 May 2006 10:11:56 -0300
> >> From: "Darlan Vivian" <darlan at bry.com.br>
> >> Subject: Symmetricon bc635PCI-U
> >> To: "ntp.isc.org" <questions at lists.ntp.isc.org>
> >> Message-ID: <003601c67821$24b7d880$f3000080 at BRY>
> >> Content-Type: text/plain; format=flowed; charset="Windows-1252";
> >> reply-type=original
> >> We have a system for Linux that need precise time for time stamping
> >> application.
> >> The bc635PCI-U (or bc637PCI-U) card have a driver package for Linux
> >> that contains a kernel driver which allows the board to be used as a
> >> reference time source for the NTP daemon? This turns the computer nto
> >> a NTP time server which can also provide accurate time to other NTP
> >> clients on the network.
> >> Sincerely,
> >> ________________________________
> >> Darlan Vivian
> >> www.bry.com.br
> >> Florianópolis - SC - Brasil
> >> Greg Dowd
> >> gdowd at symmetricom dot com (antispam format)
> >> Technologist, TT&M Div.
> >> Symmetricom, Inc. www.symmetricom.com
> >> "The current implementation is non-obvious and may need to be improved."
> >> _______________________________________________
> >> questions mailing list
> >> questions at lists.ntp.isc.org
> >> https://lists.ntp.isc.org/mailman/listinfo/questions
Symmetricom has a Linux device driver (and others) here:
It's not available in source code format
I have written a device driver for FreeBSD, standard BSD open-source
license. I don't have anywhere to post it for download, but will send
a tarball (54K) of the source code files to anyone interested. It will
probably work on NetBSD and OpenBSD with a bit of fiddling.
More information about the questions