J784S4XEVM: Get/Define OSPI memory frequency during boot

Hi,

Which boot flow your are using SBL or SPL?

Best Regards,
Sudheer

Hi,

I am using the SPL boot flow.

Regards,

Bruce

Hi Bruce,

What do you want to keep the frequency as? We have only test controller frequency of 25MHz in DDR mode without phy tuning. With phy tuning, upto 166MHz is characterized.

You can change this in device-tree files for ospi controller and the flash part node.

Regards,
Tanmay

Hi,

I'd like to set the OSPI frequency to 50 MHz. Is this possible?

Regards,

Bruce

Hi Bruce,

50MHz is not advised nor tested for OSPI mode. What is the exact requirement here? If its about read speeds, you should be able to get faster speed with the help of phy tuning.

Regards,
Tanmay

Hi Tanmay,

I'd like to boot my evaluation board (J784S4) in OPSI BOOT mode and observe the boot time evolution with different OPSI frequencies.

Regards,

Bruce

Hi Bruce,

Tanmay Patil said:

What do you want to keep the frequency as? We have only test controller frequency of 25MHz in DDR mode without phy tuning. With phy tuning, upto 166MHz is characterized.

As mentioned above by Tanmay. You could try with the already validated frequencies and measure the boot time.

Intermediate frequencies are not validated.

- Keerthy