STM32MP135 DDR3 DQM Write Mask Failure (Byte writes only)

[TP1]

I have a custom design with STM32mp135f + MT41K256M16TW-107 DDR3L @ 533MHz that I want to bring up. I built a Linux image based on OpenSTLinux guides and it boots until my kernel is loaded (uboot logs : “starting kernel”) then its crashes without any logs even with earlycon. By testing the DDR with ST DDR Tool, I realized that byte-masked writes fail (test 9), but halfword & RMW32 work. 
 

I noticed the byte lane swap but it is identical on the dk board. I am a bit lost and don’t know if the issue is timing/config related or due to my hardware design. 
 

[mƎALLEm]

Hello ​@TP1 and welcome to the ST community,

You have posted your thread in a wrong forum board (STM32 MCUs Boards and hardware tools). Your question is about a MPU product.

I moved your post to “STM32 MPUs Products and hardware related” forum board.

Good luck.