[Letux-kernel] 2GB vs. 4GB Pyra RAM tests

Tony Lindgren tony at atomide.com
Thu Aug 17 18:19:36 CEST 2017


* Matthijs van Duin <matthijsvanduin at gmail.com> [170817 08:59]:
> On 17 August 2017 at 17:48, Tony Lindgren <tony at atomide.com> wrote:
> > We have omap_ddr_clk() return 531840000 in u-boot, so not 400 MHz.
> > But since the current timings work at 1.42V, I don't see why they
> > would need to be tweaked for 1.35V.
> 
> They shouldn't have to be. I'm not sure why 400 MHz was brought up in
> the first place, I assumed perhaps as experiment (although I'm not
> sure what exactly we would learn from it).

The voltage affects slew rate though as whatever pull resistance
on lines stays the same for different voltages, right?

Like ED pointed out, check out table 72 vs 73 in the ddr3 data sheet.

Regards,

Tony


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