[parthitce]

为什么提交这份PR (why to submit this PR)

Add support for the Renesas RH850 G4KH core, tested on the QEMU rh850-u2c machine.

你的解决方案是什么 (what is your solution)

• libcpu/rh850: thread switch through TRAP0, nested interrupts, FPU context, fault dumps
• bsp/renesas/rh850: startup, INTC, OSTM and RLIN3 UART drivers, and the qemu-rh850-u2c board
• CI: hard and soft float builds and kernel utests on QEMU

Draft: the utest CI needs a ctime.c fix for picolibc first (separate PR).

Tested on QEMU with toolchain v1.1.0 (GCC 14.3, picolibc) and qemu-rh850 v1.0.0: msh boots, kernel_basic 22/22, mem and ipc utests pass, hard and soft float.

• https://github.com/linumiz/rh850-gcc-toolchain/releases/tag/v1.1.0
• https://github.com/linumiz/qemu-rh850/releases/tag/v1.0.0

请提供验证的bsp和config (provide the config and bsp)

• BSP: bsp/renesas/rh850/qemu-rh850-u2c

• .config: default. Soft float: RT_USING_FPU=n

• action:

[CLAassistant]

All committers have signed the CLA.

[github-actions]

👋 感谢您对 RT-Thread 的贡献！Thank you for your contribution to RT-Thread!

为确保代码符合 RT-Thread 的编码规范，请在你的仓库中执行以下步骤运行代码格式化工作流（如果格式化CI运行失败）。
To ensure your code complies with RT-Thread's coding style, please run the code formatting workflow by following the steps below (If the formatting of CI fails to run).

---

🛠 操作步骤 | Steps

1. 前往 Actions 页面 | Go to the Actions page
   点击进入工作流 → | Click to open workflow →

2. 点击 Run workflow | Click Run workflow

• Use workflow from 保持默认分支（通常为 master）
  Keep the default branch (usually master) in Use workflow from
• 在 branch 输入框填写 PR 分支 rh850/upstream
  Enter PR branch rh850/upstream in the branch field
• 设置需排除的文件/目录（目录请以"/"结尾）
  Set files/directories to exclude (directories should end with "/")

3. 等待工作流完成 | Wait for the workflow to complete
   格式化后的代码将作为独立提交推送至你的分支。
   The formatting changes will be pushed to your branch as a separate commit.

完成后，提交将自动更新至 rh850/upstream 分支，关联的 Pull Request 也会同步更新。
Once completed, commits will be pushed to the rh850/upstream branch automatically, and the related Pull Request will be updated.

如有问题欢迎联系我们，再次感谢您的贡献！💐
If you have any questions, feel free to reach out. Thanks again for your contribution!

[github-actions]

📌 Code Review Assignment

🏷️ Tag: bsp_renesas

Reviewers: @kurisaW

Changed Files (Click to expand)

• bsp/renesas/rh850/libraries/Kconfig
• bsp/renesas/rh850/libraries/SConscript
• bsp/renesas/rh850/libraries/common/SConscript
• bsp/renesas/rh850/libraries/common/startup_gcc.S
• bsp/renesas/rh850/libraries/drivers/SConscript
• bsp/renesas/rh850/libraries/drivers/drv_intc.c
• bsp/renesas/rh850/libraries/drivers/drv_intc.h
• bsp/renesas/rh850/libraries/drivers/drv_ostm.c
• bsp/renesas/rh850/libraries/drivers/drv_ostm.h
• bsp/renesas/rh850/libraries/drivers/drv_usart.c
• bsp/renesas/rh850/libraries/drivers/drv_usart.h
• bsp/renesas/rh850/libraries/u2c/SConscript
• bsp/renesas/rh850/libraries/u2c/soc.c
• bsp/renesas/rh850/libraries/u2c/soc.h
• bsp/renesas/rh850/qemu-rh850-u2c/.ci/attachconfig/ci.attachconfig.yml
• bsp/renesas/rh850/qemu-rh850-u2c/.config
• bsp/renesas/rh850/qemu-rh850-u2c/Kconfig
• bsp/renesas/rh850/qemu-rh850-u2c/README.md
• bsp/renesas/rh850/qemu-rh850-u2c/SConscript
• bsp/renesas/rh850/qemu-rh850-u2c/SConstruct
• bsp/renesas/rh850/qemu-rh850-u2c/applications/SConscript
• bsp/renesas/rh850/qemu-rh850-u2c/applications/main.c
• bsp/renesas/rh850/qemu-rh850-u2c/board/SConscript
• bsp/renesas/rh850/qemu-rh850-u2c/board/board.c
• bsp/renesas/rh850/qemu-rh850-u2c/board/board.h
• bsp/renesas/rh850/qemu-rh850-u2c/board/linker_scripts/link.lds

🏷️ Tag: workflow

Reviewers: @Rbb666 @kurisaW @supperthomas

Changed Files (Click to expand)

• .github/ALL_BSP_COMPILE.json
• .github/workflows/bsp_buildings.yml
• .github/workflows/utest_auto_run.yml

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📊 Current Review Status (Last Updated: 2026-11-07 04:41 CST)

• ⌛ @Rbb666 Pending Review
• ⌛ @kurisaW Pending Review
• ⌛ @supperthomas Pending Review

---

📝 Review Instructions

1. 维护者可以通过单击此处来刷新审查状态: 🔄 刷新状态
   Maintainers can refresh the review status by clicking here: 🔄 Refresh Status

2. 确认审核通过后评论 LGTM/lgtm
   Comment LGTM/lgtm after confirming approval

3. PR合并前需至少一位维护者确认
   PR must be confirmed by at least one maintainer before merging

ℹ️ 刷新CI状态操作需要具备仓库写入权限。
ℹ️ Refresh CI status operation requires repository Write permission.

[github-actions]

MemBrowse Memory Report · Explore what changed →

No memory changes detected for:

• at32f415-start
• esp32-c3
• gd32105r-start
• hc32f334
• hpmicro-hpm5100evk
• hpmicro-hpm5301evklite
• infineon-psoc6
• k230
• loongson-ls1cdev
• nordic-nrf51822
• nuvoton-m487
• nxp-lpc1114
• qemu-virt64-aarch64
• raspberry-pico-rp2040
• renesas-ra2l1
• simulator
• stm32f407-rt-spark
• stm32l475-atk-pandora-llvm
• wch-ch32v208w-r0
• x86
• xuantie-e901plus

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_{Catch memory regressions in CI with MemBrowse. Free for open source.}

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