Hi Nikolay, Le Wed, 28 Jan 2015 00:35:30 +0200, Nikolay Dimitrov <[email protected]> a écrit : > On 01/27/2015 10:51 PM, Eric Bénard wrote: > > Hi Nikolay, > > > > Le Tue, 27 Jan 2015 22:23:15 +0200, > > Nikolay Dimitrov <[email protected]> a écrit : > >> On 01/27/2015 07:40 PM, Gonzalez, Alex wrote: > >>> Nikolay, > >>> > >>> Assuming this is a custom board, if you are using different memory or > >>> with a different configuration from the reference designs, you may need > >>> to change the memory calibration to suit the hardware. Freescale support > >>> can provide an application note that explains how to perform the > >>> calibration over a representative sample of boards. > >> > >> Yes, this is a custom board. I've already did the DDR3 calibration for > >> this design and validated it with 48h testing with the Freescale DDR > >> stress test tool (available on the IMX Community site). > >> > > are you sure of the stability of your power supplies under loard (not > > only the memories' one) ? > > Hmm, very good question. I haven't attached a scope to the voltage > rails, but that can be done easily. What would you advice for > considering as an acceptable voltage noise amplitude on the CPU rails? > as small as possible and no spikes under load with probe as close as possible to the CPU and good GND reference.
Best regards Eric -- _______________________________________________ meta-freescale mailing list [email protected] https://lists.yoctoproject.org/listinfo/meta-freescale
