Re: Backport of a 2.6.x USB driver to 2.4.32 - help needed

[Heiko Gerstung <heiko.gerstung@meinberg.de>]

Hi, Lennart:

Lennart Sorensen wrote:
> On Tue, Jun 06, 2006 at 01:41:02PM +0200, Heiko Gerstung wrote:
>> Yes, but unfortunately I have no chance to do this and therefore I rely
>> on others to do this. Well, the same applies to [me] and [kernel
>> drivers], but I hoped that it might be easier to try and backport one
>> driver instead of trying to improve other people's code (maybe that is
>> what OPC stands for :-)), especially when this code has a much larger
>> impact on several parts of the kernel.
> 
> Which part of PPS doesn't work on 2.6 if you have the PPS-kit-light
> installed?  There is a version for 2.6.15 around, which applies to
> 2.6.16 with minimal fixing.  Only problem I found so far with the code
> was that it breaks the serial console on my system, but that was easy to
> fix.  I still have to test it though since my serial port has the CD
> line stuck high at the moment until I can get the board fixed, so
> testing is a bit tricky.
> 
> I know I have run a gps receiver with PPS on the CD line under 2.6.8
> using PPS-kit-light, and it worked rather well.

It works but on my system it takes ~4 hours before I reach lower
microsecond offsets, where the 2.4 ppskit is below 10 microseconds after
four polling cycles. I already tried to fix that but the internal kernel
pps discipline is not working as good as  it did with the 2.4 ppskit
versions.

> 
> Len Sorensen

Kind regards,
Heiko



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