On Fri, Apr 26, 2013 at 3:16 PM, Marek Vasut <ma...@denx.de> wrote: > Dear Fabio Estevam, > >> On Fri, Apr 26, 2013 at 1:24 PM, Eric Bénard <e...@eukrea.com> wrote: >> > what are the values of these levels (previous one and new one) in mV ? >> >> 0x10 ==> 2.5V >> 0x12 ==> 2.6V >> >> 46v32m16 > > Eh? What's this code above?
It is the DDR part number on mx23evk. > >> says that VDD is : 2.5V +/- 0.2V, so 2.6V is a valid supply >> voltage. >> >> Not sure why 2.5V fails though. > > http://s8.postimg.org/dn7jhntut/imx233_olinuxino_maxi_2_5_V_rising.jpg check > this, this is as much as I got from tsvetan so far, it's the VDDMEM ramping. I > dunno what's that weird drop before it starts going from 1V5 to 2V5, but it's Why 1.5V? The VDDMEM reset value is 1.7V. > 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. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot