How to safely create a DDR definition file for HAL?

[cbcooper]

I've inherited a board that is based on an STM32MP135AAE3 and has an external DDR (W63AH6NBVABI, a DRAM 1Gb LPDDR3 from Winbond).  It appears I need to create a DDR.h file similar to the stm32mp13xx-ddr3-4Gb.h or stm32mp13xx-ddr3-8Gb.h files that STM provides (right?)  

I've taken the existing stm32mp13xx-ddr3-4Gb.h and am slowly going through, figuring out exactly what each line needs and then trying to track down the appropriate information from the DDR datasheet.  My biggest concern is that I get the timing ALMOST right and end up with a DDR that works 99.99% of the time (failing, of course, only at customer sites).

1) Is there an archive of DDR definition files somewhere that I missed?

2) Is there a better way to generate this DDR definition file?

3) Is there a way to test I did it right besides running various memory tests for days and days?

As an example, this file needs information like this:

// DDRCTRL SDRAM timing register 0

/*

Name Bits Meaning

---- ---- -------

WR2PRE 30:24 Minimum time between write and precharge to same bank

T_FAW 21:16 tFAW Valid only when 8 or more banks(or banks x bank groups) are present.

In 8-bank design, at most 4 banks must be activated in a rolling window

of tFAW cycles.

T_RAS_MAX 14:8 Maximum time between activate and precharge to same bank

T_RAS_MIN 5:0 Minimum time between activate and precharge to the same bank.

*/

[PatrickF]

Hi @cbcooper 

I think this is a current limitation on CubeMx. Meanwhile, you should use CubeMX creating a 'dummy' STM32MP135A Linux project with your DDR config.

Then in the device tree generated files, you could copy the .dtsi file and rename it in .h

Regards.

[cbcooper]

I created a project in CubeMX, set all the DDR parameters, and said Create Project.  It created an IOC file with lines like this:

DDR.DRAMTMG0=0x121B2418
DDR.DRAMTMG1=0x00040527
DDR.DRAMTMG14=0x0000004A
DDR.DRAMTMG2=0x05090C0F
DDR.DRAMTMG3=0x00A0B00C
DDR.DRAMTMG4=0x0B04070D
DDR.DRAMTMG5=0x02020808
DDR.DRAMTMG6=0x02020006

which certainly looks hopeful, but no .dtsi file and no other file containing the text DRAMTMG at all