Re: [Linuxptp-users] ptp4l doesn't recognize /dev/ptp0

[Yan Yankovskyi via Linuxptp-users]

> Just making the device node in the system does not instantiate the
> actual device in the kernel.  Only the device driver can do that.

ptp driver is built into the kernel, if you are talking about it.
I can see ptp in /proc/devices as well. But /dev/ptp0 device isn't present
after startup.


On Tue, Apr 24, 2018 at 5:30 PM, Richard Cochran 
wrote:

> On Tue, Apr 24, 2018 at 01:35:29PM +0300, Yan Yankovskyi via
> Linuxptp-users wrote:
> > I use the following command:
> >
> > mknod /dev/ptp0 c 252 0
> >
> > On ptp4l launch I'm getting the following error:
> >
> > Failed to open /dev/ptp0: No such device or address
> >
> > But it is actually present. Do you have any thoughts regarding this
> > situation?
>
> Just making the device node in the system does not instantiate the
> actual device in the kernel.  Only the device driver can do that.
>
> HTH,
> Richard
>



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Re: [Linuxptp-users] ptp4l doesn't recognize /dev/ptp0

[Richard Cochran]

On Tue, Apr 24, 2018 at 05:47:10PM +0300, Yan Yankovskyi wrote:
> ptp driver is built into the kernel, if you are talking about it.
> I can see ptp in /proc/devices as well. But /dev/ptp0 device isn't present
> after startup.

Just let systemd/udev/mdev/whatever create the device node for you.

HTH,
Richard

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Re: [Linuxptp-users] ptp4l doesn't recognize /dev/ptp0

[Richard Cochran]

On Tue, Apr 24, 2018 at 01:35:29PM +0300, Yan Yankovskyi via Linuxptp-users 
wrote:
> I use the following command:
> 
> mknod /dev/ptp0 c 252 0
> 
> On ptp4l launch I'm getting the following error:
> 
> Failed to open /dev/ptp0: No such device or address
> 
> But it is actually present. Do you have any thoughts regarding this
> situation?

Just making the device node in the system does not instantiate the
actual device in the kernel.  Only the device driver can do that.

HTH,
Richard

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