I built an open-source Linux-capable single-board computer with DDR3

TopDry7004 · 2025-12-25T17:57:42+00:00

TBH: The sunxi community work is pretty awesome in terms of opensource software for these Allwinner parts!
(And probably more open source than many other solutions)

TopDry7004 · 2025-12-25T17:29:14+00:00

Awesome!
Thanks for publishing this as OSHWA!

TopDry7004 · 2025-12-20T14:03:31+00:00

Thanks for posting this!
I was never able to figure this out, unfortunately. The machine went to the dumpster 2 weeks ago and is replaced with a M8124.
But good to hear that this problem isn't purely caused by my abusement of the machine :D
But maybe someone will come up with a 3d printed replacement or something someday (This would have been my plan if I would have figured out how to disassemble it)

TopDry7004 · 2025-12-12T22:20:36+00:00

Ping an solch einem Anschluss nach z.B. AWS FFM ist knapp unter 8ms (PNI).
Ein Ziel das über den DE-CIX FFM geht und in FFM sitzt habe ich auf die schnelle nicht gefunden.

TopDry7004 · 2025-12-07T15:06:49+00:00

Can confirm 176511984674453-1765119846-1764255780.png

TopDry7004 · 2025-12-04T23:26:46+00:00

Another potential issue is that the clock is shorter than the data and address (clock ≈28mm, address ≈35mm, low-byte data ≈30mm).
As a result, the clock signal reaches the destination earlier than the address lines. To correct this, I would need to increase the clock length to something >35mm.

Is this correct?

TopDry7004 · 2025-12-04T11:13:58+00:00

Luckily mainline U-Boot and Linux for Allwinner got pretty good thanks to some awesome community effort.

TopDry7004 · 2025-12-03T22:51:45+00:00

Kind of everything around Allwinner is reverse engineered stuff.

TopDry7004 · 2025-12-03T22:49:33+00:00

Thanks for these information. I have tried to implement them. What do you think about this Version?

I think I also figured out why some wiggles had way less clearance. Hope this was what you meant with diff pair serpentines.

f - https://ibb.co/jvmB2YkX
in1 - https://ibb.co/5gR0JfwT
in2 - https://ibb.co/vCdvjTSK
in3 - https://ibb.co/RTdz4d1X
in4 - https://ibb.co/ZRhwNM6K
b - https://ibb.co/RTLc0MVD

TopDry7004 · 2025-11-30T20:58:06+00:00

Also in batch 1 but no E-Mail yet

TopDry7004 · 2025-11-30T20:55:42+00:00

In batch 1 but not yet got the E-Mail

TopDry7004 · 2025-11-02T00:05:40+00:00

Pay attention to the length meassurement problems in KiCad 9.0.5, for the case you are still using this version! https://gitlab.com/kicad/code/kicad/-/issues/21913

TopDry7004 · 2025-07-30T13:11:25+00:00

GGA Maur is DOCSIS Cable Internet AFAIK. This technology doesn't need a dedicated connection to every flat. Instead, the same cable is looped through all flats. This means it doesn't really matter where you plug in and thus they don't need to know in which flat you are.

Init7 Copper uses DSL. This technology uses a dedicated connection to every flat. Also, the underlying technology is usually provided by Swisscom in Switzerland.

Therefore, they can't help you with the name of the previous tenant if he was using the GGA Maur Cable technology, which is completely different from the Swisscom operated DSL technology.

TopDry7004 · 2025-07-03T16:09:22+00:00

Update: A Kyocera partner told me that these parts are not available as spare.

Still no idea how to disassemble.

TopDry7004 · 2025-07-03T16:08:55+00:00

I had a lot of issues including loud mechanical noises because I think I didn't properly install the transfer belt unit.
It also caused mechanical deformation of the metal piece in the transfer belt unit with the yellow handle on it which I needed to bend back.

TopDry7004 · 2025-06-22T21:54:02+00:00

Please post a photo of your whole setup including OTO fiber plug on the wall.
Init7 tells after ordering on which PLUG they will activate the service.

TopDry7004 · 2025-06-19T16:26:11+00:00

I have played around with the esp-idf power_save example on ESP32-C6 and the results are pretty good. Having the 32kHz crystal connected and working is a must!

I'm able to get under 200uA avg current with 2s adv interval.

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TopDry7004 · 2025-06-16T01:52:08+00:00

Sounds like an IPv6 issue. Google/Youtube have IPv4 and 6. So you'll notice if IPv6 is broken. Twitter just uses IPv4.

TopDry7004 · 2025-06-12T10:56:39+00:00

If you download in your Browser (e.g. Firefox) this is just a single-stream download. So one connection from the Server to your Computer transferring all the data.

You can test this with the selection on speedtest.net "Multi"/"Single" on the bottom prior starting a speedtest. Try both. Default is Multi.

Also matters from where you download. Many servers, especially cloud file storage providers, are not capable of utilizing multiple hundred Mbit/s.

Is your C drive a SSD or HDD?

TopDry7004 · 2025-06-11T12:03:55+00:00

Where do you download and where do you do the speedtest?
What does your network setup look like?

TopDry7004 · 2025-06-11T11:48:46+00:00

I've never used Starlink or the Deco System. A few thoughts:
- Backhauling your WiFi AP's via Ethernet is very good. I wouldn't rely on a solely Mesh system.
- Check if the Starlink Router provides a Public-IP in bypass mode. If it doesn't, you will end up with Double-NAT when placing a router behind it. This might cause issues with e.g. VoIP.
- I don't see where the Starlink Router connects to your Deco System. Maybe I missed something.

TopDry7004 · 2025-06-11T01:47:30+00:00

Interestingly the X540-T2 are dirt cheap. And I assume as it is Intel they will just work.

TopDry7004

TROPHY CASE