Dear Stefano Babic, > On 27/04/2013 01:33, Marek Vasut wrote: > > Dear Otavio Salvador, > > Hi Fabio, Otavio, Marek, > > >> On Fri, Apr 26, 2013 at 5:58 PM, Marek Vasut <ma...@denx.de> wrote: > >>> Dear Otavio Salvador, > >>> > >>>> On Fri, Apr 26, 2013 at 5:08 PM, Fabio Estevam <feste...@gmail.com> wrote: > >>>>> On Fri, Apr 26, 2013 at 3:16 PM, Marek Vasut <ma...@denx.de> wrote: > >>>>>> strange at best and I don't like it. I think that's also the source > >>>>>> of our problems, the DRAM suffers undervolt and quickly afterwards > >>>>>> is configured for regular operation ... I'd say check > >>>>>> mx23_mem_setup_vddmem() and inspect the result with a scope. I think > >>>>>> we need some slow ramping function like mxs_power_set_vddx(). > >>>>> > >>>>> Ok, but can we have this patch applied and do this investigation in > >>>>> parallel? > >>>>> > >>>>> At least we could have U-boot usable on mx23 again. > >>>> > >>>> I also vote for it to be applied and then do this investigation in > >>>> parallel. Even if there're still pending issues it does improve the > >>>> current status. > >>> > >>> But someone has to do this! And so far I see noone capable/willing to > >>> do that :( > >> > >> Oh really? Fabio, other people and me are doing it. We have some > >> people helping to debug it and using their time to help testing it so > >> it seems like a false accusation. > > > > it == grabbing a scope and doing the real measurement :( > > > >> So as I said, I see no reason to not get this patch in for now. > > > > I am not against in per-se. I am worried noone will come up with real fix > > when there is a "good enough plaster" put on to cover the real problem. > > I agree that we have not yet found a clear cause of the behavior - but > ler me say that is quite bound to the hardware and how voltage is > applied to the DDR. As the patch reports to allow to boot kernel in most > cases, I agree with Fabio to apply this - and IMHO most investigation > should be done by the hardware developers.
Yes, I am already pestering Tsvetan to stop lazing around and do the measurement ;-) Actually, CCed. So far, we only have the VDDMEM graph which doesn't look nice :-( Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot