AM62L-PROCESSOR-SDK: custom board don't work well with DDR4

Hi Tony,

Do you still use the SDK v11.0.0.3 or the issue also happens with the new SDK v11.0.5.2?

Hi Bin,

Customer is using SDK v11.0.5.2.

Hi Tony,

Does the issue happens in every boot? on every board?

Can you please try to reduce DDR speed to see if the issue still happens?

Hi Bin,

Customer brought up only 1pcs board.

Reduce DDR speed resulting in can't enter SPL, tried 400MHz and 533MHz, result is more worse. although in 800MHz with Cache disable, sometimes hang during tftp downloading Kernel. 

DDR part number: GDQ2BFAA-WQ

800MHz:

/cfs-file/__key/communityserver-discussions-components-files/791/k3_2D00_am62Lx_2D00_ddr_2D00_config.dtsi

400MHz:

/cfs-file/__key/communityserver-discussions-components-files/791/k3_2D00_am62Lx_2D00_ddr_2D00_config_2D00_400M.dtsi

Hi Tony,

This sounds like DDR stability problem. I am routing your query to our DDR expert for comments.

Tony, can you have them try with the attached configuration?  We recently found that the default configuration for AM62L was inadvertently enabling CA Parity, but this is not supported in AM62L.  I also tweaked a few parameters based on the datasheet and the DDR4-2666 speed grade they are using (you can see those in untitled.syscfg.

/cfs-file/__key/communityserver-discussions-components-files/791/3302.k3_2D00_am62Lx_2D00_ddr_2D00_config.dtsi

/cfs-file/__key/communityserver-discussions-components-files/791/untitled.syscfg

Also, it appears they are using a 95C rated device.  If they plan on operating above 85C, they will need to configure that in the DDR tool to ensure the correct refresh rate at high temps.  For this debug, this is not necessary to do at this time, so i did not configure for 95C

Regards,

James

The project postponed to PG1.1. did not try the approach.

ok, will close thread for now.

James