# Boot freertos in R5F core of TOPST - GHS Compiler

**URL:** <https://community.topst.ai/t/boot-freertos-in-r5f-core-of-topst-ghs-compiler/1123>\
**Category:** D3\
**Created:** [September 30, 2026, 11:25am UTC](https://community.topst.ai/t/boot-freertos-in-r5f-core-of-topst-ghs-compiler/1123 "2026-09-30T11:25:18Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Sujith](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@Sujith](https://community.topst.ai/u/Sujith)\
**Post date:** [September 30, 2026, 11:25am UTC](https://community.topst.ai/t/boot-freertos-in-r5f-core-of-topst-ghs-compiler/1123/1 "2026-09-30T11:25:18Z")

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### 이 글은 기술 질문입니다.

on

### 사용 보드

D3-G

### 보드 이미지 또는 펌웨어

FreeRTOS

### 사용자 PC 또는 빌드 환경

Windows

### 사용자 PC 운영체제 버전

Windows 11

### SDK/BSP 버전

> **[GitHub - topst-development/D3G-R5: D3G-R5 for TOPST SBC](https://github.com/topst-development/D3G-R5/tree/edu/motrex)**
>
> edu/motrex

### 기술 분야

SDK/BSP 빌드

### 질문 내용

I used the fwdn\_r5.bat to program the r5f core but the rf5 core is not booting up

I flashed the freertos r5.rom file

Tried attaching Lauterbach debugger - below is the screenshot:

 ![image](https://canada1.discourse-cdn.com/flex004/uploads/topst/original/2X/4/4fafc53a97e074526919073b9377494b99d1c121.png)

### 현재 상태 또는 발생 증상

R5F not booting up

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**Author:** ![TOPST-manager-cy](https://avatars.discourse-cdn.com/v4/letter/t/35a633/32.png) [@TOPST-manager-cy](https://community.topst.ai/u/TOPST-manager-cy)\
**Post date:** [October 1, 2026, 5:29am UTC](https://community.topst.ai/t/boot-freertos-in-r5f-core-of-topst-ghs-compiler/1123/2 "2026-10-01T05:29:52Z")

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Hello, this is the tospt manager.  
First of all, to use the R5 core on D3-G, you need to change the boot mode.  
Please first check if the register change work has been done, as shown in the picture below.

 ![image](https://canada1.discourse-cdn.com/flex004/uploads/topst/original/2X/8/8764a26e81122f7c2713e42e4b9561264c2a7640.jpeg)

Thank you.

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<div class="post-metadata">

**Author:** ![Sujith](https://avatars.discourse-cdn.com/v4/letter/s/77aa72/32.png) [@Sujith](https://community.topst.ai/u/Sujith)\
**Post date:** [October 7, 2026, 9:51am UTC](https://community.topst.ai/t/boot-freertos-in-r5f-core-of-topst-ghs-compiler/1123/3 "2026-10-07T09:51:39Z")

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Thank you this worked.