Configure RAM capacity in u-boot for iMX8MP

trongthinh — Wed, 06 Dec 2023 02:40:43 GMT

In the file: https://github.com/nxp-imx/uboot-imx/blob/7376547b9e424b2d0f42dfe96394168c781ca297/include/configs/imx8mp_evk.h#L4

has the following code:

/* Totally 6GB DDR */ #define CONFIG_SYS_SDRAM_BASE 0x40000000 #define PHYS_SDRAM 0x40000000 #define PHYS_SDRAM_SIZE 0xC0000000 /* 3 GB */ #define PHYS_SDRAM_2 0x100000000 #ifdef CONFIG_TARGET_IMX8MP_DDR4_EVK #define PHYS_SDRAM_2_SIZE 0x40000000 /* 1 GB */ #else #define PHYS_SDRAM_2_SIZE 0xC0000000 /* 3 GB */ #endif

Because I changed the RAM capacity from 6GB (according to Kit iMX8MP-evk) to 4GB. so I need to understand the meaning of this code to change it. Please explain to me. Thank you!

Re: Configure RAM capacity in u-boot for iMX8MP

brian14 — Tue, 12 Dec 2023 14:55:37 GMT

Hi @trongthinh,

Thank you for contacting NXP Support.

/* Totally 6GB DDR */ #define CONFIG_SYS_SDRAM_BASE 0x40000000 //This refers to the base where the memory starts. #define PHYS_SDRAM 0x40000000 //This refers to the starting point too. #define PHYS_SDRAM_SIZE 0xC0000000 /* 3 GB */ //This value is the size that you will need for your first die on your memory. In this case 3GB. #define PHYS_SDRAM_2 0x100000000 //This refers to the starting point too. #ifdef CONFIG_TARGET_IMX8MP_DDR4_EVK #define PHYS_SDRAM_2_SIZE 0x40000000 /* 1 GB */ //This is a configuration for 1GB size #else #define PHYS_SDRAM_2_SIZE 0xC0000000 /* 3 GB */ //This is a configuration for 3GB size #endif

You will need to configure this code based on your memory datasheet.

I hope this information will be helpful.

Have a great day!

topic Configure RAM capacity in u-boot for iMX8MP in i.MX Processors

Configure RAM capacity in u-boot for iMX8MP

Re: Configure RAM capacity in u-boot for iMX8MP