[BPI-R3] hw issues


I want to summarize known hw issues to point bpi-team to it and get bundled rensponse


@sinovoip can you give statements on these and when they are fixed?

Hi frank,

  1. We have confirmed with MTK that using PL2303 will have such problem, the solution is to use CH340 or CP2012, MTK also recommends using FDTI’s


When powered on, if the uart tx is pulled high, it will cause this

  1. We will remove R171 and R173 in the next SMT

  2. This is an error caused by negligence when we first time SMT, and we have contacted the customer for repair. The same issues will not occur in future.

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Hi simon,thanks for info

Ftdi and cp21xx is also reported to have the uart-wifi issue,but only with v1.1. i have no such issue with v1.0 and a cp2102 (edit: sry it is cp2104,cp2102 fail). So something has changed in v1.1. If it will be fixed in next rev it’s ok. I was not sure you’re working on it.i will try to compare v1.1 shematic with v1.0.

Edit: the circuit above is same in v1.1 and v1.0. So probably not the cause for the issues.

As steven told you,v1.1 are only adding hole for 2230 nvme, moving bootswitches together, add common usb2 and a sata power connector. We also bought pl2303 to test v1.0 and v1.1, both will have this issues. Also discussed this with steven, he recommend ftdi.We have tested ch340,cp2102,FT4232, all are ok.

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Is there maybe ETA for 1.2? as at least the has stock https://pl.aliexpress.com/item/1005004716456913.html

hi, @simon, ch340G seems not working too, have one from r2pro-tests, currently have a larger ft232RL connected with mini-usb…i hope the CH340E i ordered recently working…cp2102 is also failing…cp2104 works,but found no small ones on ebay or aliexpress for in-case use

is there any other small usb2uart adapter having mounting-holes and micro-usb/usb-c connector working here? any way to fix this problem (in future hw-revs)?

For metal case i guess it needs some ventilation holes and holes for mounting a (40x40mm) fan. And selecting fan voltage by a switch (without soldering) would be nice.

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I just tried my CH340G out, and no it doesn’t work.

Did you ever find out if that works?

These ch340 i ordered were 5v and not 3v3 so i have them not tested on r3.

So working are cp2104 (hard to get) and ft232rl

I actually use a CH341, that is primarly a SPI programmer. But tit has a UART jumper and RX TX pins to use it as an emulator.

You can shoot two birds with one stone with having thing like that. Just look for the version that has UART switch or jumper set.

For CH341 you also have to make sure it can operate with 3.3V signal level, you can easily kill the RX on the SoC be feeding it with 5V.

Why would you even need to feed any voltage? GND and I/O is enough.


I got it, There are boards with logic selection. Mine is only 3.3V.

Found some time to verify rst/factory-button again…i can now read the values from uboot (initial 1,pressed 0) on my v1.1 board with plugged m.2 nvme

So this is fixed

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I have ESP-01S connected to my board, normally with the GND disconnected as I don’t want to leave the wifi to serial available all the time.

So my board crashes sometimes, and it seems to be a CH340 one.


Maybe the better hack I see for an ESP-01 :+1: What firmware do you use?

My USB to Serial-TTL adapter is a DSD-TECH SH-U09C5 with 4 selectable TTL levels and a lot of pins I have never used! https://www.deshide.com/product-details.html?pid=303205&_t=1661493660