I'm having bad luck.
after a power cycle I`ve got this error in one of the boards (all the 4 COM's)
Do not have user privileges required to open \\.\COMXX
I un installed coms ports and turn off the boards? but it still persists could it be a usb issue?
Edit:After reseting my pc now have two boards with this error ?¿?¿ both boards have been worked fine before.
This might not be the problem but we have seen cases where the USB gets screwed up in Windows and once it does the com port is never seen again. However if this is the problem all is not lost. Basically there is a FTDI utilility to do a driver removal and cleanup after which a clean install of the driver usually sorts the issue. If anyone things this is their problem send an email to our bitcoin support email "bitcoin.support" AT "enterpoint.co.uk" and the relevant person will see it early next week when they are back in. Once I have the full details of how to do this myself I will try and get the recovery process listed on one of our webpages so it is easy to find.
On a different point if we do happen to have a DCM issue with power noise then we already have a tested fix. That's what we used to test a Glasswalker2 variant last week at 200MHz operation on an early board and it's very stable. It's not the same as the Controller build as publically available but because we built in a very flexible clocking system into Cairnsmore1 we don't actually have to use DCMs within array FPGAs. Simply we can direct supply a 200MHz clock, or anything similar 0-300MHz , straight to the FPGA to run the logic on. If this looks the way to go we will expand testing of this technique over a larger board sample.
Over the last 2 days we have been running Makomk's 190 build on rig of 20+ boards and we have very good results on our testing.
Well after losts of pc reboots . board power cycles and uninstalled Com ports in w7. i didn't fix anything with that weird card.
This morning when i went to work I left my card powered but no hashing. Now I'm back at home and without reboot i unpluged usb cable and board responded again ?¿?¿? ( last night i did that hundreds of times...)
I suspect my usb hub is crap because after rebooting sometimes the board/s that doesnt work is different ( so is not a cable problem) because each board has always the same cable .
or as you have said some kind of issue usb-driver /motherboard/w7. ( i thought about temp too but yesterday i had A/A all time.)
I'm going to send you an email to the given address, so next time it happens try to see if that "uninstall driver tool" helps in any way.
PS: d-link 7 port usb hub have nice price in amazon .uk now . anyone has got it and is working well with their cm1?
Thank you yoham for your support.