SD card issues

Marty

I have two boards which have issues with MicroSD card. It works somehow once out of 10 power-ons. I resoldered and checked all pins and seems to be OK. The slots are from the same supplier and batch as others that work well.

Is there any problem with removing SD card while BE is powered on?

Marty

Maybe I can ask another way - how to debug inaccessible SD card? Normally I insert the card to the slot and after reset, /sd directory is shown as default. I have some examples when /flash is selected as default even in case valid card is inserted. After trying chdir "/sd" I get an error message "File open error".
Or, how to generally change from /flash to /sd and vice versa?

davegardnerisme

I had similar experience on some of my builds. It was down to soldering which I could tell because if I applied pressure to card holder and then reset then it would work, and then if I released pressure it would fail. Sounds like you’ve checked and resoldered but I would pursue that because this was the issue for me.

Marty

davegardnerisme thanks Dave, I will check it. Maybe I did some short on the MicroSD slot data pins.

Marty

davegardnerisme well it really was a soldering issue.. after adding some solder and reheating all the pins everything works now. Thanks. ?

bitartrate

This is my experience with the SD card slot so far. None of my Basic Engines where reading the SD card until I updated the firmware to "basicengine-firmware-default-v0.88-alpha-346.bin". Of the remaining that wouldn't read a card: one was a bad socket and I also found I got ahold of a bad SD card.