boot failure, timeout waiting for hardware interrupt

Question

I've acquired a brand new RaspberryPi/8GB-USD and set it up with the recommended OS, Raspbean. Booting occasionally works, so I am familiar with the desktop, but mostly it fails and I just have to retry by switching the power off and on.

The error seems to be connected with the lower of the two USB ports and I get it regardless of which device (keyboard or mouse) I plug in to that port. In response to hidraw2: USB HID v1.10 Device USB Keyboard1 on usb-_usb1.3/Input1bcm2700 I get nnc0: Timeout waiting for hardware interrupt - cmd25 followed by Timeout waiting for hardware interrupt - cmd12.

I've noticed that when I plug into the bottom USB port it doesn't go in quite as far as when I plug into the top port. Is there any chance that I've been given a faulty kit?

Hugh

iagorubio · Answer

If you get mmc0 errors, it's most likely you got your card's data corrupted. That can happen for switching it on and off, instead of using the halt command of the "power off" menu entry in the graphical desktop. MMC stands for Multi Media Card and mmc0 is the 1st card on the system - if there were two the following one would be mmc1 and so on. I don't think it have anything to do with the USB ports. I would first try to buy a new card and put Raspbian on it again to try. If with a new one fails I would then check for what can be causing it. Take care there are many bad cards in the market. Try to buy one of those: RPi SD cards - eLinux.org

rew · Answer

I suspect that the error is about "mmc0". This is the SD card.

Can you find a different SD card to test on short notice? I'd suggest that you do that!

The raspberry pi is quite tolerant of its input voltage. However, Micro USB cables are often sold that have a resistance that result in a way too low voltage. Sometimes this can cause problems. Check the voltage at the raspberry pi (TP1 and TP2). The SD card is supposed to run at 3.3V, leaving quite somar margin before things go wrong if the 5V is not enough. But in fact, the 3.3V dropping too low is the first sign of "not enough power".