RE: AM625: AM625 DDR4 Configuration with uboot

Hi James,

Thank you very much for the memory tester. I was able to run it and get the output.

As I mentioned earlier, we are running good at 400 MHz (800 MTs) and the output of the memtester proved it.

Not surprisingly, it was complete failure with 800 MHz (1600 MTs) but this is another issue.

Now, I have another problem with the U-Boot. The 4 GB memory is properly configured as far as I can tell since we can write to both segments (mw) - 0x8000_0000 and 0x8_8000_0000 - and read the data (md) at the U-Boot prompt. No aliasing.

However, bdinfo displays both memory segments at 0x8000_0000 and modifies the Linux device tree before it boots in Linux, and as a result Linux does not see the full 4GB (just the 2 GB). U-Boot prompt image is attached. Uboot_Prompt.docx

The memory is declared in U-Boot as:

memory@80000000 {
  device_type = "memory";
/* 4G RAM */
reg = <0x00000000 0x80000000 0x00000000 0x80000000>,
      <0x00000008 0x80000000 0x00000000 0x80000000>;

And the correct k3-am62x-ddr-config.dtsi file generated with Sysconfig is used. (Which is proven by the fact that the physical memory segments are configured and accessible)

Here is the text that our software engineers wanted me to add to this message in order to clarify it:

1. Include the new ddr config DTSi in R5 DTs.

Regards,

Kris