| Re: [chrony-dev] [RFC] Support for raw memory mapped clock sources |
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On Tue, Oct 21, 2025 at 16:09:40 +0200, Enguerrand de Ribaucourt wrote:
> On 10/21/25 15:58, Miroslav Lichvar wrote:
....
> > My suggestion would be 1, but use the SOCK refclock instead of SHM as
> > that is considered deprecated due to some security issues. I don't
> > like the idea of adding another driver like that.
>
> Thank you very much for your input, I'll follow the first approach then.
Another option would be to write a kernel module to expose the FPGA's
registers as a /dev/ptp device. (I *think* it is possible to expose PTP
device without it being a NIC, but I'd have to check the code.) Chrony and
other timekeeping related software already know how to use those. Granted,
writing kernel code is way more effort than a simple mmio <-> SOCK refclock
user tool.
Jeff.
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