DDR4

story — Thu, 09 Jul 2020 11:26:24 GMT

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.

Re: DDR4

igorpadykov — Thu, 09 Jul 2020 23:49:04 GMT

Hi 扬杨

first one can try to build wothout tee, look at linux documentation Yocto Guide on

Embedded Linux for i.MX Applications Processors | NXP

also some patches were sent you via mail.

Best regards
igor
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i.MX ProcessorsのトピックDDR4

DDR4

Re: DDR4