I bought two Rock 3s from okdo.com I am going to attempt documenting my progress, if I am able to even boot the thing. Jeff Geerling made a video about it: https://github.com/geerlingguy/raspberry-pi-pcie-devices/issues/327

Try to use other node than Node 1. On some boards Node 1 can be tricky to use for flashing

# Attempt 2: Rock3's RPi IO board process, Flashing with Raspberry Pi IO Board (WIP) https://wiki.radxa.com/Rock3/installusb-install-radxa-cm3-rpi-cm4-io I am waiting for my Raspberry Pi IO board to arrive

- Turn off the node power - Set device mode on node 2 - Turn on the node power

yes

Are you using USB A-A cable?

I have a capture card device with a working usb A-C cable I am repurposing

USB A-C cables rarely work for people and it's not yet known why

that could be another reason why its not working for me as well

Also, if cable is too long, this might be causing issues too

I bought an RPi IO board pending delivery, but I will also look for a USB a-a cable

I'm curious to see the results.

hmm

My cable is 5 feet long

okay, i will get the 3 foot one

I ordered like super short one to check (25 cm)

@DhanOS I went on a little shopping trip. I bought a usb a-a cable (and nvme, and sd card)

low key curious to see how you get on, if we get booting with decent speed networking then I bet for a bunch of us we could get these instead of pi's given they're in stock

I think I heard/saw somewhere that networking works but PCIe doesn't?

Maye you find this useful too: https://github.com/geerlingguy/sbc-reviews/issues/15

Hey @provamer - how did you get on with this?

@colin would you say it's worth investing purely for compute? I only plan on running k8s so.

Yeah, purely for compute it could be decent. Looks like Geerling hasn't reported the cpu bench result yet. Presumably someone has though. Will maybe run it if I have some time. I'm led to believe it's not as powerful as CM4. But they don't exist.

Yeah I can't really find much in the way of benchmarks, network and disk performance would be good to know too

agreed.

https://browser.geekbench.com/v5/cpu/compare/20089201?baseline=18364983 is the closest I can find really

@colin Did you manage to get the CM3 flashed using the Turing Pi? I've also been fighting with these all weekend and could use a bone right about now! Seems no matter what I do I'm getting hardware-level USB protocol errors. Don't think it's my cable or setup as I have a Jetson TX2 that is identified correctly

Hey hey @talliifennec I didn't manage to flash it with Turing Pi, unfortunately. But I did get it flashed with the radxa cm3 IO board. So you'll need to get hold of that to flash the modules. I'll stick a write up somewhere soon but basically I: * Used the Radxa Cm3 IO board to flash an OS to eMMC using the Radxa instructions on their Cm3 IO board guide. ( https://wiki.radxa.com/Rock3/installusb-install-radxa-cm3-io ) * Checked that it booted on the Radxa IO board. It did and had network access. * stuck it into the Tp2 on a CM adaptor board + powered the node. * It booted up the node no problem at all. Found the IP and ssh'ed no problems at all. I was half expecting lots of issues and hacking about - but it was honestly as simple as that.

A quick update for those interested- I reviewed the Radxa CM3 IO schematics and the only difference I could tell in the (admittedly very brief) reverse engineering of the Turing Pi's OTG circuitry was that the CM3 IO makes use of a single pin (number 97) on the additional 3rd connector. That pin is the

USB_OTG0_VBUSDET

pin on the RK3566, which is used to detect whether the USB port should operate as a device or a host. Grounding this pin indicates to the RK3566 that it should operate in device mode. The CM3 IO board uses a 2.7k resistor to accomplish this, but I simply shorted the pin to ground (it is conveniently directly next to pin 99 on the connector, which is a GND), and the device is now showing up using the Turing CM4 Breakout board and Turing Pi with no additional lift. Gonna try flashing as I get time later today, will report back with results!

Good idea so, this is flashing with TP2 rather than radxa IO?

Yes, this is just with the TP2 and the CM4 Adapter. I drafted and ordered a PCB on a flex substrate, I think that'll fit between the CM3 and the adapter. Something like so:

Sorry for being MIA, I have been traveling and moving. I have not set up my turing pi in my new residence. But I will continue with it soon-ish. Thank you for sharing your progress.

Howdy folks. Any further info or documentation on this?

What you looking for @.quietdreams ?

Hey 🙂 I've manage to get some CM3 without eMMC but with 8G of ram for a few bucks Did anyone manage to get a CM3 eMMC-less working on the turing pi ? 🤔 I've got the SD booting on the CM3io board & update the SPI of the CM3 but no boot whatsoever on the turing :/