Hi Terry, > > It's still worth reading that trouble-shooting thread, the one that > > says that, at the time of writing, none of the Zeroes returned as > > faulty have been faulty, and they all go through factory testing. > > :-) Includes booting without an SD card to observe USB activity on > > connected host IIRC. > > Tried that. Not a peep, which is interesting because, I would have > expected that test to work. I tried it with and without power on the > Pi.
Does sound a bit dead then. Has it been connected to any test circuitry yet? :-) > Even if it had worked, I would have queried the result. Without the > SD Card, the Pi is only running the microcode that gets it booted and > services the needed ports such as the USB. It wouldn't necessarily > mean that the Pi could complete the boot. No, perhaps the SD-card connector's broken, I agree. But the test sounds correct. The Zero has only the single On The Go USB port provided by the BCM SoC, the SoC's GPU that boots it runs the first bit of bootstrapping from ROM, so no SD card needed, and that can read the next bootstrap stage from SD card into L2 cache (there's no RAM enabled yet). But that first-stage ROM code also enables USB as a simple bulk endpoint so you can boot over USB instead, and thus it should appear in lsusb(8)'s output. https://github.com/raspberrypi/tools/tree/master/usbboot#readme Cheers, Ralph. -- Next meeting: Bournemouth, Tuesday, 2016-02-02 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ New thread: mailto:dorset@mailman.lug.org.uk / CHECK IF YOU'RE REPLYING Reporting bugs well: http://goo.gl/4Xue / TO THE LIST OR THE AUTHOR
