Hi Richard:
We use Arasan GEMAC-1588-AVB， clock control looks like simple, a fix 100M
clock as input, you could change Increment Attributes Register for ethernet
system timer
I think it doen't have fine freq adjustment. So this should be reason?
Register settting example
• If the Increment Value is 10 and the Increment Period is 1, a value of
10 is added to
the counter every clock. This gives a counter operating at
nanosecond resolution and
counts time in terms of nanoseconds.
• If the Increment Value is 100 and the Increment Period is 1, a value
of 100 is added
to the counter every clock. This gives a counter operating at
0.1 ns resolution and
counts time in terms of 0.1 ns.
Timestamping generate by hardware, be save by register, driver read tx/rx
timestamp then pass them to application.
Does ptp4l has a feather that only adjust time offset not freq ?
Thans for your reply .
-----邮件原件-----
发件人: Richard Cochran [mailto:richardcoch...@gmail.com]
发送时间: 2022年7月6日 22:01
收件人: Gao Meitao（高玫涛） <meitao...@asrmicro.com>
抄送: linuxptp-users@lists.sourceforge.net
主题: Re: [Linuxptp-users] PTP
On Wed, Jul 06, 2022 at 06:07:40AM +0000, Gao Meitao（高玫涛） wrote:
> Hi all:
>
> I try to test ptp as slave for my evb borad, and found that it seem
> not work properly , as you can see from below logs
> First run, it seem be out of control by ptp, after run again, thing
> seem work fine.
>
> Any suggestion about this ? thanks in advance
What device is that?
Check the implementation of the hardware and of the device driver WRT:
1. clock control
2. time stamp generation + reporting
Good luck,
Richard
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