I think I'm closer to the answer. It seems to lie in the register AGPIO_CFG at address 0x1000003C. It switches the GPIOs 14 through 29 between the digital pins and the analog ethernet counterparts. Would this modification to AGPIO be done in the DTSI file, some bootloader/kernel parameter or do I need to make a patch to something somewhere? I'm aware I could use something like devmem to directly set this register from userspace but I assume there is something a bit cleaner?

@crispyoz It's nice that you like it. Thanks.

@luz How to detect... "locally"? It is fairly easy since there is an Onion Omega2+ / Onion Omega2 sticker on the device If you don't believe the sticker a reboot command and the bootloader messages on the Serial Console can help. For example - please watch the 'find flash: ' line: # HW Omega2+ # FW v0.3.2 b240 # http://repo.onioniot.com.s3.amazonaws.com/omega2/images/omega2-v0.3.2-b240.bin # U-Boot 1.1.3 (Oct 18 2016 - 17:29:05) root@Omega-5BE1:/# reboot ____ _ ____ / __ \___ (_)__ ___ / __ \__ _ ___ ___ ____ _ / /_/ / _ \/ / _ \/ _ \ / /_/ / ' \/ -_) _ `/ _ `/ \____/_//_/_/\___/_//_/ \____/_/_/_/\__/\_, /\_,_/ W H A T W I L L Y O U I N V E N T ? /___/" Board: Onion Omega2 APSoC DRAM: 128 MB relocate_code Pointer at: 87f60000 ****************************** Software System Reset Occurred ****************************** flash manufacture id: c2, device id 20 19 find flash: MX25L25635E ============================================ Onion Omega2 UBoot Version: 4.3.0.3 --- root@Omega-5BE1:/# ubus call system board { "kernel": "4.14.81", "hostname": "Omega-5BE1", "system": "MediaTek MT7688 ver:1 eco:2", "model": "Onion Omega2", "board_name": "omega2", "release": { "distribution": "OpenWrt", "version": "18.06-SNAPSHOT", "revision": "r0+7471-90181760c3", "target": "ramips\/mt76x8", "description": "OpenWrt 18.06-SNAPSHOT r0+7471-90181760c3" } } # HW Omega2+ # FW v0.3.2 b240 # http://repo.onioniot.com.s3.amazonaws.com/omega2/images/omega2p-v0.3.2-b240.bin # U-Boot 1.1.3 (Oct 18 2016 - 17:29:05) root@Omega-5BE1:/# reboot ____ _ ____ / __ \___ (_)__ ___ / __ \__ _ ___ ___ ____ _ / /_/ / _ \/ / _ \/ _ \ / /_/ / ' \/ -_) _ `/ _ `/ \____/_//_/_/\___/_//_/ \____/_/_/_/\__/\_, /\_,_/ W H A T W I L L Y O U I N V E N T ? /___/" Board: Onion Omega2 APSoC DRAM: 128 MB relocate_code Pointer at: 87f60000 ****************************** Software System Reset Occurred ****************************** flash manufacture id: c2, device id 20 19 find flash: MX25L25635E ============================================ Onion Omega2 UBoot Version: 4.3.0.3 --- root@Omega-5BE1:/# ubus call system board { "kernel": "4.14.81", "hostname": "Omega-5BE1", "system": "MediaTek MT7688 ver:1 eco:2", "model": "Onion Omega2+", "board_name": "omega2p", "release": { "distribution": "OpenWrt", "version": "18.06-SNAPSHOT", "revision": "r0+7471-90181760c3", "target": "ramips\/mt76x8", "description": "OpenWrt 18.06-SNAPSHOT r0+7471-90181760c3" } } # HW Omega2 # FW v0.3.2 b240 # http://repo.onioniot.com.s3.amazonaws.com/omega2/images/omega2-v0.3.2-b240.bin # U-Boot 1.1.3 (Oct 18 2016 - 17:30:55) root@Omega-5533:/# reboot ____ _ ____ / __ \___ (_)__ ___ / __ \__ _ ___ ___ ____ _ / /_/ / _ \/ / _ \/ _ \ / /_/ / ' \/ -_) _ `/ _ `/ \____/_//_/_/\___/_//_/ \____/_/_/_/\__/\_, /\_,_/ W H A T W I L L Y O U I N V E N T ? /___/" Board: Onion Omega2 APSoC DRAM: 64 MB relocate_code Pointer at: 83f60000 flash manufacture id: ef, device id 40 18 find flash: W25Q128BV ============================================ Onion Omega2 UBoot Version: 4.3.0.3 --- root@Omega-5533:/# ubus call system board { "kernel": "4.14.81", "hostname": "Omega-5533", "system": "MediaTek MT7688 ver:1 eco:2", "model": "Onion Omega2", "board_name": "omega2", "release": { "distribution": "OpenWrt", "version": "18.06-SNAPSHOT", "revision": "r0+7471-90181760c3", "target": "ramips\/mt76x8", "description": "OpenWrt 18.06-SNAPSHOT r0+7471-90181760c3" } } How to detect... "remotely"? That is the question.

Your information is very interesting. Thank you for sharing

Thanks @György-Farkas and @crispyoz for the confirmation. I have seen the 2S reference but just wanted to make sure before I spin out a PCB as there is a discrepancy with the 2/+.

Thanks will certainly consider the chip option. I'll also try and copy the trace antenna from the dev board image as best as possible and compare results.

When powered directly, without the dev board, power consumption is as expected 141mA@3V3 when idling with WiFi off.

That worked. Thanks so much.

@Lazar-Demin @György-Farkas thanks, I was starting to think I was stupid. This explains some inconsistent outcomes I was experiencing.

readValue needs to be passed as a reference, since the contents will be modified by the i2c_read function. That's likely causing the segmentation fault. Or change readValue to a point and allocate two bytes before passing it to i2c_read See the documentation for the i2c_read function for more details: http://docs.onion.io/omega2-docs/i2c-c-library.html#i2c-c-read-multiple-bytes

@Don-Elwell I've wondered about the same thing when thinking about an Omega2(S) with a PCIe graphics card Let me know if you find out something..

I now stumbled upon similar case, if not the same with another board. I was able to connect access point of Omega2S and open putty to run commands. After I have run command wifisetup and select option 1, link with omega broke, and I think it also rebooted. I'm not sure about all circumstances, as I didn't connect via serial port. Then I made conection with O2S again and check ifconfig. I noticed that there is suspecious eth0.1 interface. So I decided to run command ifconfig eth0.1 down to disable that interface. Then I tried to run wifisetup and this time it was succesful! I managed to finish instalation of all needed software and it works like a charm. I can't check if it's the same with one that I had problems with, as it is not on it's board anymore, but for this one it worked.

@Jeff-Seese Does anybody else have ... a real hard reset solution? Here you are a "brute force" solution by Onion for the HW_RST button problem of Omega2S+. It should work theoretically if you put a resistor between the base (1) and emitter (2) of the Q2 PNP transistor. I wonder what about in practice because I do not have such devices. Omega2S-Dev-Board.pdf

@Zheng-Han Thank you for your reply. Sorry to be a pain but can I specify my previous question? According to @Larry-Pinney's photo Omega2+ has a Winbond 25Q256FV flash. Does Omega2S+ also have a Winbond 25Q256FV or some fully equivalent flash chip? @Zheng-Han said in Newly minted Omega2S: yes, Omega2S+ has the same spec as Omega2+ in terms of CPU, RAM and Flash Because if yes, that would mean it has the same 3B / 4B address mode issue than the Omega2+ has and its HW Reset is broken too. Please correct me if I'm wrong.

@Richard-Chabot kernel patch for correct omega2+ reboot Caveat: It always reboots, even with the poweroff command.