AM68A: Single chip LPDDR4 configuration

Your question has been initially assigned to Kevin

Hi,

Can you post the log file illustrating the issue? Can you also post the modifications you made?

Common problems I have observed in the past (maybe fixed in SDK10.x) when trying to boot with just 1x DDRSS with AM68x:

1. Bootloader code is still trying to initialize the un-populated DDRSS
2. Total DDR size not adjusted in u-boot (which gets passed to Linux)

For the first issue above, can you check the file <UBOOT>/arch/arm/mach-k3/j721s2_init.c for similar code as below? Could you try commenting out the call to 

uclass_next_device_err and the corresponding if statement?

https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/arch/arm/mach-k3/j721s2_init.c?h=10.01.10#n241 

void k3_mem_init(void)
{
	struct udevice *dev;
	int ret;

	if (IS_ENABLED(CONFIG_K3_J721E_DDRSS)) {
		ret = uclass_get_device_by_name(UCLASS_MISC, "msmc", &dev);
		if (ret)
			panic("Probe of msmc failed: %d\n", ret);

		ret = uclass_get_device(UCLASS_RAM, 0, &dev);
		if (ret)
			panic("DRAM 0 init failed: %d\n", ret);

		ret = uclass_next_device_err(&dev);
		if (ret && ret != -ENODEV)
			panic("DRAM 1 init failed: %d\n", ret);
	}
	spl_enable_cache();
}

For the second issue, can you check the file <UBOOT>/arch/arm/dts/k3-am68-sk-som.dtsi (or your similar custom DTSI file) for the code below? This should be updated from 16GB to the corresponding memory available on your board.

https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/arch/arm/dts/k3-am68-sk-som.dtsi?h=10.01.10#n12

	memory@80000000 {
		device_type = "memory";
		bootph-all;
		/* 16 GB RAM */
		reg = <0x00000000 0x80000000 0x00000000 0x80000000>,
		      <0x00000008 0x80000000 0x00000003 0x80000000>;
	};

Regards,
Kevin