[PATCH v3 11/19] imx: kontron-sl-mx8mm: Remove 100mt DDR setpoint

[Frieder Schrempf]

Hi Tim,

On 21.10.22 21:24, Tim Harvey wrote:
> On Wed, Aug 24, 2022 at 7:01 AM Frieder Schrempf <frieder at fris.de> wrote:
>>
>> From: Frieder Schrempf <frieder.schrempf at kontron.de>
>>
>> The new stable configuration is missing the 100mt setpoint, remove
>> it before updating the config to make sure the changes are separated
>> cleanly.
>>
>> Signed-off-by: Frieder Schrempf <frieder.schrempf at kontron.de>
>> Reviewed-by: Fabio Estevam <festevam at denx.de>
>> ---
> 
> Frieder,
> 
> I just noticed this patch and was curious what it was about.
> 
> What do you mean by 'the new stable configuration is missing the 100mt
> setpoint'? Does this refer to something NXP has changed in their DDR
> config tools?

At some point we started using 4GB LPDDR4 chips from Nanya on our SoMs
while before we only had Micron chips. For some unknown reason (NXP
couldn't explain it either), the only configuration that works for all
used chips (Micron and Nanya) is only stable if the lowest of the three
frequency setpoints is removed.

Unfortunately I have no idea how this behavior could be explained.

Best regards
Frieder