I've bought a new -xM, 5V power supply, usb-to-serial cable, fired up
an minicom and after Linux on SD card is load I get:
[ 1261.783172] hub 2-2:1.0: over-current change on port 3
[ 1262.039154] hub 2-2:1.0: over-current change on port 3
[ 1262.295166] hub 2-2:1.0: over-current change on port 3
[ 1262.551147] hub 2-2:1.0: over-current change on port 3
[ 1262.807128] hub 2-2:1.0: over-current change on port 3
[ 1263.063110] hub 2-2:1.0: over-current change on port 3
[ 1263.319091] hub 2-2:1.0: over-current change on port 3
[ 1263.575103] hub 2-2:1.0: over-current change on port 3
[ 1263.831085] hub 2-2:1.0: over-current change on port 3
[ 1264.087066] hub 2-2:1.0: over-current change on port 3
[ 1264.343048] hub 2-2:1.0: over-current change on port 3
From what I was able to test everything works except one USB port (the
one near the corner of the board, on the bottom).
Do I need to request the RMA? How much is to going to cost me (two way
shippment?). Is there a way to suppress this error as it is a show
breaker if I'm going to work with a serial port. Do you think that it
is a good idea to just ignore this error?
Yes, you need an RMA. But, it may be a while befre they respond. The Thanksgiving Holidays are underway in the US.
You pay the shipping to the repair depot and they pay the return shipment.
What this error means is that one of the USB power portsis detecting an over current condition because the over current pin is low. This usuially means that the power FET has been damaged. Damage can occur in some cases if the 5V power supply is not well regulated. If you are capable, you could lift that pin from the board. You would need to refer to the System Reference Manual and schematic on how to do that.
Are you using the SD card that came with the board?
Yes. I'm using a SD that was in the BB once it arrived.
`klogd -c 3` has cleared the noise for me on the serial console so the
one non-working USB port is not an issue for me. And shipping from
Poland to US is probably worth more than fixing this so if there's no
risk that something else may get wrong because of ignoring this
problem I'll probably leave it as is.
What do you mean by lifting the pin from the board? Physically or
removing the electrical connection? Will the port start working then
or will it just prevent complaining in kernel log?
BTW. I thought that -xM got overvoltage protection so I'm a bit
puzzled how cheap, but still proper 5V PS could damage a port.