imx6q: DDR handling from 3.0.35 to 3.10.17

[controlhorus]

Hello

We have a custom imx6q board working with a 3.0.35 kernel. We parametrized our  DDR with the Freescale tools and put the final data on the u-boot software. We thought that kernel 3.0.35 do nothing with this DDR parameters and it let the work to uboot.

Now we are moving to 3.10.17.

While I was searching looking for a way to configure CCM_CCOSR on a 3.10.17, I surfed to this thread:

iMX6Q with 3.10.17 linux kernel and 400MHz DDR clock

So I go to our DTS file, copied from sabreSD (our board model), and I can see that DDR frecuency is 528MHz.

Several questions:

  - Is there a similar configuration in 3.0.35?

  - Is it possible that the 3.0.35 kernel changed some other DDR configuration parameter?

  - I reviewed some of Linux 3.10.17 dts Documentation files and only find: busfreq-imx6.txt. So it seems that only DDR frequency is affected. Is  it a correct conclusion?

Best regards,

Jose

[igorpadykov]

Hi Diego

in new kernels ddr initialization is made in cfg file, like

board\freescale\imx\ddr\mx6q_4x_mt41j128.cfg

how to change DDR clock of i.mx6

Best regards

igor

[controlhorus]

Hello Igor

Is not that the uboot board DDR file? We are using it.

At your link I can see that they said DDR parameters are fixed on uboot start. And nobody denies it. So I suppose it keeps going that way .. apart from the DDR clock configuration at DTS file.

Thanks

[igorpadykov · Accepted solution]

Hi Diego

there are no other DDR initializations except

in *.cfg file.

Best regards

igor