New board - where in Linux to setup DDR3 timing?

fred basset

I have a new board coming in soon based on the BeagleBone, but with DDR3. I can see in U-Boot where and how to configure the DDR3, but I can't see where it's done in the Linux kernel? Can anyone assist? Does the config. need to be done if it's already done in the boot loader?

over 12 years ago

0 Gururaja Hebbar over 12 years ago

TI__Intellectual 2725 points

DDR [2/3] only needs to be configured in linux during suspend/resume procedure. else its not required to be configured from linux.

0 fred basset over 12 years ago in reply to Gururaja Hebbar

Prodigy 110 points

So who sets up the DDR timing then? Is it U-Boot? In reading the U-Boot documentation they say their philosiphy is to de-initialize any interface they initialize at the end of the bootup.

0 Gururaja Hebbar over 12 years ago in reply to fred basset

TI__Intellectual 2725 points

fred basset said:

So who sets up the DDR timing then? Is it U-Boot?

Yes. Correct. U-Boot, configures the DDR timing.

fred basset said:

In reading the U-Boot documentation they say their philosiphy is to de-initialize any interface they initialize at the end of the bootup.

No. That's not entirely true. Few things like interrupt, cache are cleared but reset all are left as it is.

Regards

Gururaja

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New board - where in Linux to setup DDR3 timing?