hi，
My chip is i.MX8M MINI, I replaced DDR, use 4GB ram, uboot will get stuck every time.
1. I used mscale_ddr_tool_v310 to test，
Number of DDR controllers used on the SoC: 1
Density per chip select: 4096MB
Density per controller is: 4096MB
Total density detected on the board is: 4096MB
******************************************
******************************************
============ Step 2: DDR memory accessing... ============
Verifying DDR frequency point0@1200MHz.......Pass
Verifying DDR frequency point1@533MHz.......Pass
[Result] OK
============ Step 3: DDR parameters processing... ============
[Result] Done
Success: DDR Calibration completed!!!
2. I updated the generated parameter ddr4_timing.c to uboot, modify
```
#define PHYS_SDRAM_SIZE 0x100000000 /* 4GB DDR */
```
But after starting it will get stuck:
CPU: Freescale i.MX8MMQ rev1.0 1800 MHz (running at 1200 MHz)
CPU: Commercial temperature grade (0C to 115C) at 51C
Reset cause: POR
Model: FSL i.MX8MM DDR4 EVK board
DRAM:
Can't we have a configuration larger than 2G,
When I change PHYS_SDRAM_SIZE to 0x80000000 /* 2GB DDR */, it can start normally. If it exceeds 2G, it will get stuck.
