[time-nuts] Re: Can Anyone Help Me Get PPS Into This Mini PC?

[Andrew Rodland]

Since Celerons aren't known for having random GPIOs right on the CPU, it's
probably on some little I2C or LPC chip, and doesn't have an IRQ suitable
for the pps-gpio driver.

On Mon, Feb 12, 2024 at 11:35 AM Ed Armstrong via time-nuts <
time-nuts at lists.febo.com> wrote:

> I recently purchased one of these mini PCs to be used as my router.
>
> https://cwwk.net/products/cwwk-x86-p5-super-mini-router-12th-gen-intel-n100-ddr5-4800mhz-firewall-pc-2x-i226-v-2-5g-lan-fanless-mini-pc?variant=44732374352104
>
>
>
> I am going to be running the new 64-bit Intel release of the excellent
> "Tomato" router firmwareTomato64 <https://tomato64.org/>, which can be
> installed either "bare-metal" or as a virtual machine. I am going the
> virtual machine route using proxmox v8.1.3. The tiny PC idles at about 9
> W and maxes out around 18 W, and has considerably more power than I need
> for my routing purposes. So, I also put my FreePBX on a separate virtual
> machine, also located on this mini PC. But that is probably not very
> interesting to anyone here, nor is it really part of my question.
>
> Proxmox is a Linux based OS which is designed for the express purpose of
> running virtual machines. I suspect many of you on this mailing list may
> already be using it yourself. I am currently running my own stratum one
> NTP server on a Raspberry Pi 3 which is getting its PPS from a GPSDO.
> well, proxmox comes with chrony already installed, and I'm sure I could
> change it over to ntpd if I wished to do so. If any of you follow my
> first link, you will see the little mini PC has a header for GPIO. It is
> a 2x5 header with I believe a 2 mm pitch. According to the listing,
> there are four input and four output pins. I assume the other two pins
> are either both grounds or both positive, not really sure.
>
> Now comes my question. Can any of you tell me how to use these GPIO
> pins? I can find tons of information very easily on setting this thing
> up as a router, NAS, or as a desktop computer. I have not been able to
> find a single post related to those GPIO pins. I can't find the pin out,
> can't find out what voltage they are supposed to work at, nor any
> information about communicating with them in Linux. I queried the
> system, hoping I could look up the motherboard online, and this is what
> I got:
>
> root at Proxmox:~# dmidecode -t 2
> # dmidecode 3.4
> Getting SMBIOS data from sysfs.
> SMBIOS 3.6.0 present.
> # SMBIOS implementations newer than version 3.5.0 are not
> # fully supported by this version of dmidecode.
>
> Handle 0x0002, DMI type 2, 15 bytes
> Base Board Information
>          Manufacturer: Default string
>          Product Name: Default string
>          Version: Default string
>          Serial Number: Default string
>          Asset Tag: Default string
>          Features:
>                  Board is a hosting board
>                  Board is replaceable
>          Location In Chassis: Default string
>          Chassis Handle: 0x0003
>          Type: Motherboard
>          Contained Object Handles: 0
>
> root at Proxmox:~#
>
> I also tried dmidecode -t baseboard, this obviously gave more details,
> but most devices were just listed as "other". I haven't found this to be
> terribly useful.
>
> My desire is to replace the Raspberry Pi by syncing chrony or ntpd to
> the PPS in proxmox and using that instead. It would save a tiny amount
> of energy, and would remove the slight jitter caused by the ethernet
> port being on USP, I believe. Can anybody on here give me some idea on
> how to do this, or perhaps point me in the right direction to find the
> information I need.
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