[BPI-R64] mPCIe hardware pin 48

Banana Pi Router design
1

Hi all, I’ve started to try to fit an Advantech DVP-7641e video capture board on my R64 … without too much positive result yet. The board is not even detected and both pcie slots keep saying they are down at boot. I was then inspecting the drawings of the R64 and noticed that pin 48 is connected to +5V. image Is there any reason for that ? Did anyone see any issue with this pin 48 on different boards ? Sylvain

2

I guess it is similar to BPI-R64, issue with Quectel EP06

And i hope you did not brick your card. Which voltage does your card need on pins 46-48?

I do not know why @sinovoip use 5v on 46/48 but some cards need lower voltages and will be damaged. If 5v is needed by some cards there is a need for voltage selection (defaulting to 1v8 to not brick cards on first try)

3

Thanks, right, Looks quite the same ! For sure, this voltage mismatch can cause damages … My card is running hot, not too many, but enough to say that something is going wrong. As it is not detected by the pci system, I expect it has passed away. Too bad. I’ll check the compatibility better, next time. Do you know if there is a PCB placement doc anywhere available ? One test could be to remove R227 but it looks quite difficult to figure where it is actually?

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I do not have such layout document and know no easier way :frowning:

Maybe @sinovoip can explain why they used 5v here and how to find this resistor (which is basicly a bridge because of 0 ohm)

Edit (do not want to add a new answer for this):

The why is interesting because to prevent such issues in future

5

Bad news.
Anyway, I’m not so interested in knowing why they did it but rather how to get rid of this potential issue :wink: Thanks a lot for taking time to answer and let’s wait for @sinovoip if they can help.