TDA4VM: TDA4 failed to boot,

Hi, TI teams;

It's our custom board leverage design of TDA4 EVM. 

We have confirmed that all power and reset, clock signal we know are at correct states, and 

We can successfully connect SOC's M3 core with JTAG.  However, when we try to run the initialization script using JTAG, it throws an error at the "write memory" stage. 

We checked the DDR0_RESETn signal of LPDDR4, it was driven Low by TDA4.

What may be the cause of the problem that the TDA4 failed to release the reset of DDR? How to check at which stage the boot sequence hangs?