i.MX ProcessorsのトピックRe: i.MX8MP Memory Device Tree Configuration

i.MX8MP Memory Device Tree Configuration

Wobaffet — Fri, 14 Apr 2023 13:30:29 GMT

Hello, For our custom board, we'll have 512MB LPDDR4 MT53E128M32D2DS-046 from micron. In the EVK DT, 6GB memory configured as follows:

memory@40000000 { device_type = "memory"; reg = <0x0 0x40000000 0 0xc0000000>, <0x1 0x00000000 0 0xc0000000>; };

According to memory mapping from Reference Manual of the processor DDR addressing is like this:

So can I configure for our board like this:

memory@40000000 { device_type = "memory"; reg = <0x0 0x40000000 0 0x20000000>; };

or do I need to configure like this?

memory@40000000 { device_type = "memory"; reg = <0x0 0x40000000 0 0x10000000>, <0x1 0x00000000 0 0x10000000>; };

Dhruvit — Mon, 17 Apr 2023 11:40:57 GMT

I hope you are doing well.

One can define memory node for 512MB LPDDR4 DRAM in dts as below.

memory@40000000 { device_type = "memory"; reg = <0x0 0x40000000 0 0x20000000>; };

Additional changes are also required for 512MB DRAM in u-boot-imx.

In the board configuration header file. (/include/configs/..)

#define PHYS_SDRAM 0x40000000 #define PHYS_SDRAM_SIZE 0x2000000

Please refer to 5.7 Adding OP-TEE support for a new board in i.MX Porting Guide and change CFG_DDR_SIZE (if op-tee is used.)

Thanks & Regards,
Dhruvit Vasavada