On Fri, Apr 26, 2013 at 3:16 PM, Marek Vasut marex@denx.de wrote:
Dear Fabio Estevam,
On Fri, Apr 26, 2013 at 1:24 PM, Eric Bénard eric@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.