topic Zephyr: Ramloader: RAM load not working on mimxrt1064-evk and zephyr4.1. in MCX Microcontrollers

Zephyr: Ramloader: RAM load not working on mimxrt1064-evk and zephyr4.1.

mastergbc — Wed, 25 Jun 2025 01:29:59 GMT

I followed the `Relocating to SDRAM` example with . I would like to ask about it. Because ram load did not work as expected.

1. I used MCUXpresso for vs code extension to get blinky sample from nxp_zephyr_nxp_v4_1_0 repository.

2. Added boards/mimxrt1064_evk.conf.

CONFIG_NXP_FLEXSPI_ROM_RAMLOADER=y

3. Added boards/mimxrt1064_evk.overlay.

/ { chosen { zephyr,flash = &sdram_code; zephyr,sram = &sdram_data; }; }; &sdram0 { #address-cells = < 0x1 >; #size-cells = < 0x1 >; /* Divide SDRAM into two partitions for Code and Data */ sdram_code: memory@0 { device_type = "memory"; reg = <0x00000000 DT_SIZE_M(16)>; }; sdram_data: memory@1000000 { device_type = "memory"; reg = <0x01000000 DT_SIZE_M(16)>; }; };

4. build project. FLASH and RAM regions below:

Memory region Used Size Region Size %age Used SDRAM: 0 GB 32 MB 0.00% FLASH: 32822 B 32 MB 0.10% RAM: 4288 B 16 MB 0.03%

5. build/zephyr/zephyr.map below:

<Text start region> text 0x00000000000022c0 0x3648 0x00000000000022c0 __text_region_start = . <Text end region> 0x0000000000005908 . = ALIGN (0x4) 0x0000000000005908 __text_region_end = . <Data start region> datas 0x0000000001000000 0x1c load address 0x0000000080008000 0x0000000001000000 __data_region_start = . 0x0000000001000000 __data_start = . <Data end region> 0x0000000001000032 _net_buf_pool_list_end = . 0x0000000001000032 __data_region_end = .

Why is the relocation for Ramload not working properly? Please let me know if I missed anything in following the guide.

Re: Zephyr: Ramloader: RAM load not working on mimxrt1064-evk and zephyr4.1.

Gavin_Jia — Thu, 26 Jun 2025 09:12:57 GMT

Hi @mastergbc ,

Thanks for your interest in NXP MIMXRT series!

I followed the Chapter 3.3.2 and had the same issue. I am asking for expert help to confirm this issue, please wait for my news. Thanks!

Best regards,
Gavin

Re: Zephyr: Ramloader: RAM load not working on mimxrt1064-evk and zephyr4.1.

jacobwienecke — Fri, 27 Jun 2025 16:26:58 GMT

@mastergbc Can you try adding address translation for the child nodes?

I believe that the address translation was either performed automatically or the child nodes were indexing into the parent node in a previous version of zephyr.

&sdram0 { ranges = <0x00000000 0x80000000 DT_SIZE_M(32) >; #address-cells = < 0x1 >; #size-cells = < 0x1 >; /*Divide SDRAM into two partitions for Code and Data */ sdram_code: memory@0 { device_type = "memory"; reg = <0x00000000 DT_SIZE_M(16)>; }; sdram_data: memory@1000000 { device_type = "memory"; reg = <0x01000000 DT_SIZE_M(16)>; }; };

The ranges property will translate the base address in SDRAM to the CPU address.

Re: Zephyr: Ramloader: RAM load not working on mimxrt1064-evk and zephyr4.1.

mastergbc — Mon, 30 Jun 2025 07:16:31 GMT

Good solution.