On Fri, Jun 19, 2015 at 11:08:26AM +0100, bruce bushby wrote: > Hi Maxime > > > So you're using a DT for a board that is not yours. Please NEVER do > > that, unless you're willing to take the risk of blowing your board up. > > I'm using the "A13-SOM" cpu module from Olimex ....which I believed > was a close match to the "A13-OLinuXino" board minus some > peripherals. I'm using them to learn so have a half dozen for when > they break. ..."touch wood" so far so good.
Unless you know for a fact that the board are exactly the same, don't do that. > > Do you have pullups on that bus? > > Nothing is connected to the module besides the 3.3V power and a uart > for uart0 (console) ...it's booting from sdcard. Previously I was > using the A20-SOM ....although that was via the EVB. Would a Soc > require pullups to scan an empty bus? ...perhaps this is my > problem. Pull-ups are needed on both lines of any I2C bus. If the board doesn't have any, you might have your problem. You can try to enable the internal ones in the pinctrl node that each buses use. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
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