[U-Boot] [PATCH 1/2] arm: imx6: Add DDR3 calibration code for MX6 Q/D/DL

From: Tim Harvey <tharvey@gateworks.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 1/2] arm: imx6: Add DDR3 calibration code for MX6 Q/D/DL
Date: Thu, 17 Dec 2015 07:39:23 -0800	[thread overview]
Message-ID: <CAJ+vNU17DYcRe+eWoY7gV8J11tzevhiHh_GMN8kUg3G8yUGSKQ@mail.gmail.com> (raw)
In-Reply-To: <56717C96.1030203@nelint.com>

On Wed, Dec 16, 2015 at 7:00 AM, Eric Nelson <eric@nelint.com> wrote:
> Hi Marek,
>
> On 12/16/2015 07:40 AM, Marek Vasut wrote:
>> Add DDR3 calibration code for i.MX6Q, i.MX6D and i.MX6DL. This code
>> fine-tunes the behavior of the MMDC controller in order to improve
>> the signal integrity and memory stability.
>>
>
> I'm glad to see that others are interested in this.
>
> I've been working on something similar, but struggling to have time
> to finish and clean it up:
>         https://github.com/ericnelsonaz/u-boot/tree/memcal-pass1
>
> My aim is/was a bit different though, and aims to be a replacement for
> the DDR stress tool, which is cumbersome to use.

Eric,

I would love to see a series posted that adds IMX6 MMDC calibration
and stress test to U-Boot. I agree the Freescale code is very
difficult to use and I don't trust what its doing. I'm currently
seeing the Freescale DDR3 stress test fail on 8Gb density memory and I
am not convinced its not a problem with their code (yet I haven't had
time to pick through it with a fine toothed comb and compare with how
I setup the MMDC in U-Boot).

Regards,

Tim