Submitted a new port for RV64 SMP CPU, would love a review!

DylanPoon · March 17, 2026, 10:00am

Hi FreeRTOS team!

Thanks for all your efforts in keeping the FreeRTOS community running so well!
Just checking in on these two PRs:

github.com/FreeRTOS/FreeRTOS-Kernel-Community-Supported-Ports

Add portable files for RISC-V Xuantie C908 (#33)

main ← hongfei-poon:add-c908

opened 08:35AM - 21 Feb 26 UTC

hongfei-poon

+1088 -0

Description ----------- + Context switch implementations for Alibaba Xuantie C…908/C908V CPU + FPU and vector extensions are supported + SMP is supported Test Steps ----------- + See [DEMO](https://github.com/FreeRTOS/FreeRTOS-Community-Supported-Demos/compare/main...hongfei-poon:FreeRTOS-Community-Supported-Demos:add-c908?expand=1) By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

github.com/FreeRTOS/FreeRTOS-Community-Supported-Demos

Add demo of RISC-V Xuantie C908 portable files (#24)

main ← hongfei-poon:add-c908

opened 09:29AM - 21 Feb 26 UTC

hongfei-poon

+83273 -0

Description ----------- + Add demos for ALIBABA Xuantie C908/C908V CPU, runnin…g on `QEMU` + Platform related files: `RISC-V_XUANTIE_C908V_GCC/bsp` + Interrupt Entry point for all interrupts : `RISC-V_XUANTIE_C908_GCC/bsp/chip_riscv_dummy/src/sys/irq.c` + do_irq() + All interrupts go through this function **except Machine Level Software Interrupt** + libc: `RISC-V_XUANTIE_C908V_GCC/bsp/libc_freertos`, lightweight C library implementation including printf (UART output), timestamp functions, and basic memory operations + Template: `RISC-V_XUANTIE_C908V_GCC/app`, containing main function and unit tests How to Test ----------- see `RISC-V_XUANTIE_C908_GCC/README.md` #### Get GCC and QEMU - Get GCC from [xuantie-gcc-download](https://www.xrvm.cn/community/download?versionId=4460156621967921152), find `XuanTie-900-gcc-elf-newlib-x86_64-V3.2.0-20250627.tar.gz` and cllick "download". Use these commands ```cmake set(CMAKE_C_COMPILER riscv64-unknown-elf-gcc) set(CMAKE_CXX_COMPILER riscv64-unknown-elf-g++) set(CMAKE_AR riscv64-unknown-elf-ar) ``` - Get QEMU from [xuantie-qemu-download](https://www.xrvm.cn/community/download?versionId=4468398114511851520) find `XuanTie-qemu-x86_64-Ubuntu-20.04-V5.2.8-B20250721-0303.tar.gz` and click "download". Run the executable with ``` qemu-system-riscv64 -machine xiaohui -nographic -kernel <your/executable/file> -cpu c908v -m 1G ``` + Set the flags in `FreeRTOSConfig.h` and compile with these demos `one by one` ``` #define configSTART_TASK_NOTIFY_TESTS 1 #define configSTART_TASK_NOTIFY_ARRAY_TESTS 0 #define configSTART_BLOCKING_QUEUE_TESTS 0 //... ``` By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

I know you all have a lot on your plate, so there’s no rush at all.
If you need any changes or further testing from my side, please let me know.

Thanks again!

archigup · March 18, 2026, 11:58pm

Hi, I merged the two PRs, thanks!

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Submitted a new port for RV64 SMP CPU, would love a review!

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