J784S4XEVM: Get/Define OSPI memory frequency during boot

Bruce Rosier

Prodigy 90 points

Part Number: J784S4XEVM

Tool/software:

Hello all,

How can I obtain/define the OSPI memory frequency at startup ? (just before Linux) ?

Thank you in advance!

Bruce R

9 months ago

0 Doredla Sudheer Kumar 9 months ago

TI__Guru 64330 points

Hi,

Which boot flow your are using SBL or SPL?

Best Regards,
Sudheer

0 Bruce Rosier 9 months ago in reply to Doredla Sudheer Kumar

Prodigy 90 points

Hi,

I am using the SPL boot flow.

Regards,

Bruce

0 Tanmay Patil 9 months ago in reply to Bruce Rosier

TI__Mastermind 38790 points

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

0 Bruce Rosier 9 months ago in reply to Tanmay Patil

Prodigy 90 points

Hi,

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

Regards,

Bruce

0 Tanmay Patil 9 months ago in reply to Bruce Rosier

TI__Mastermind 38790 points

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

0 Bruce Rosier 9 months ago in reply to Tanmay Patil

Prodigy 90 points

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

+1 Keerthy J 8 months ago in reply to Tanmay Patil

TI__Guru**** 162990 points

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

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J784S4XEVM: Get/Define OSPI memory frequency during boot