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? > 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 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(). Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot