arm/rm57: Add support for TI Hercules RM57 and LaunchXL2 board

[daftie-zami]

This PR adds initial architecture and board support for the TI Hercules
RM57L843 LaunchXL2 evaluation board (Cortex-R5F).

RM57 shares the same Hercules architecture/register layout as TI's
TMS570 family, so peripheral and core behavior was cross-checked
against TMS570 documentation/register maps in multiple places
throughout this port (see references to TMS570 across
arch/arm/src/rm57).

Currently implemented at the chip level (arch/arm/src/rm57):

• Core boot / clock configuration / MPU init / VIM interrupt controller
• SCI1 serial driver (console)
• GIO driver (LEDs / GPIO)

Not yet covered: RM57's lockstep/safety features (CCM-R5, ESM fault
handling beyond basic setup, PBIST/STC self-test, etc). These will be
added in follow-up PRs.

Board support (boards/arm/rm57/rm57l843-launchxl2) provides an nsh
defconfig with console, NSH, autoleds/userleds and OSTest enabled.

Testing

Host: macOS
Board: TI Hercules RM57L843 LaunchXL2
Debug probe: XDS110

$ ./tools/configure.sh rm57l843-launchxl2:nsh && make 

Build Output

Copy files
Select CONFIG_HOST_MACOS=y
Select CONFIG_HOST_ARM64=y
Refreshing...
CP: arch/dummy/Kconfig to /Users/sami/Desktop/rm57-nx/nuttx/arch/dummy/dummy_kconfig
CP: boards/dummy/Kconfig to /Users/sami/Desktop/rm57-nx/nuttx/boards/dummy/dummy_kconfig
LN: platform/board to /Users/sami/Desktop/rm57-nx/nuttx-apps/platform/dummy
LN: include/arch to arch/arm/include
LN: include/arch/board to /Users/sami/Desktop/rm57-nx/nuttx/boards/arm/rm57/rm57l843-launchxl2/include
LN: drivers/platform to /Users/sami/Desktop/rm57-nx/nuttx/drivers/dummy
LN: include/arch/chip to /Users/sami/Desktop/rm57-nx/nuttx/arch/arm/include/rm57
LN: arch/arm/src/chip to /Users/sami/Desktop/rm57-nx/nuttx/arch/arm/src/rm57
LN: arch/arm/src/board to /Users/sami/Desktop/rm57-nx/nuttx/boards/arm/rm57/rm57l843-launchxl2/src
...
...
...
Memory region         Used Size  Region Size  %age Used
        flash:      343564 B         4 MB      8.19%
         sram:       11080 B       512 KB      2.11%
CP: nuttx.bin

OS test

[Copilot]

Pull request overview

This PR introduces initial NuttX architecture support for the TI Hercules RM57 (Cortex-R5F) and adds a board port + NSH defconfig for the RM57L843 LaunchXL2 evaluation board. It establishes the core boot path and a minimal set of peripherals (clocking/MPU/VIM/RTI tick/SCI console/GIO LEDs) to get NSH and basic tests running on hardware.

Changes:

• Add ARCH_CHIP_RM57 with RM57L843 chip selection and core early-boot (clocking, SRAM init/ECC clear, MPU, VIM IRQ dispatch, RTI timer tick).
• Add SCI1 serial driver + low-level console bring-up and a minimal GIO implementation used for LEDs.
• Add the rm57l843-launchxl2 board port (Kconfig, linker script, LED support, and nsh defconfig).

Reviewed changes

Copilot reviewed 48 out of 48 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
boards/Kconfig	Registers the new RM57 LaunchXL2 board option and board name default.
boards/arm/rm57/rm57l843-launchxl2/Kconfig	Board-level Kconfig stub for the new platform.
boards/arm/rm57/rm57l843-launchxl2/CMakeLists.txt	Adds board build integration for CMake.
boards/arm/rm57/rm57l843-launchxl2/include/board.h	Defines board clocks, flash wait-states, RTI clock, and LED mappings.
boards/arm/rm57/rm57l843-launchxl2/configs/nsh/defconfig	Provides an NSH configuration enabling SCI1 console, LEDs, and ostest.
boards/arm/rm57/rm57l843-launchxl2/scripts/Make.defs	Board build flags and linker script selection.
boards/arm/rm57/rm57l843-launchxl2/scripts/flash-sram.ld	Flash/SRAM linker script and vector table retention behavior.
boards/arm/rm57/rm57l843-launchxl2/src/Makefile	Board build integration for the Makefile build.
boards/arm/rm57/rm57l843-launchxl2/src/CMakeLists.txt	Board source selection for CMake builds.
boards/arm/rm57/rm57l843-launchxl2/src/rm57l843-launchxl2.h	Board-private definitions (GIO pin configuration for LEDs).
boards/arm/rm57/rm57l843-launchxl2/src/rm57_autoleds.c	Auto-LED behavior for OS state indication.
boards/arm/rm57/rm57l843-launchxl2/src/rm57_userleds.c	User LED API implementation (board_userled*).
boards/arm/rm57/rm57l843-launchxl2/src/rm57_initialize.c	Early and late board initialization hooks.
boards/arm/rm57/rm57l843-launchxl2/src/rm57_bringup.c	Board bring-up stub (late init hook target).
arch/arm/Kconfig	Adds RM57 as a selectable ARM chip family and wires in chip Kconfig.
arch/arm/include/rm57/chip.h	RM57L843 chip constants (flash/RAM sizes, peripheral counts).
arch/arm/include/rm57/rm57l843_irq.h	RM57L843 VIM request/channel definitions.
arch/arm/include/rm57/irq.h	RM57 IRQ numbering and inclusion of chip-specific IRQ map.
arch/arm/src/rm57/Kconfig	RM57 chip selection + SCI1 peripheral Kconfig.
arch/arm/src/rm57/Make.defs	Adds RM57 arch sources and removes GICv2 common sources.
arch/arm/src/rm57/CMakeLists.txt	Adds RM57 arch sources to the CMake build.
arch/arm/src/rm57/chip.h	RM57 internal chip header and cache line size definitions.
arch/arm/src/rm57/rm57_boot.h	Declares RM57 boot entrypoints (core init + board init).
arch/arm/src/rm57/rm57_boot.c	Implements the RM57 boot sequence (clocks, SRAM init, MPU, console, nx_start).
arch/arm/src/rm57/rm57_coreinit.S	Early lockstep-safe core register/SPSR initialization routine.
arch/arm/src/rm57/rm57_clockconfig.h	Declares RM57 clock configuration entrypoint.
arch/arm/src/rm57/rm57_clockconfig.c	Implements HALCoGen-derived PLL/flash wait-state/peripheral clock setup.
arch/arm/src/rm57/rm57_mpuinit.h	MPU region configuration helpers (flash/SRAM/peripherals).
arch/arm/src/rm57/rm57_mpuinit.c	MPU init/reset and region setup.
arch/arm/src/rm57/rm57_irq.h	Declares RM57-specific IRQ helpers (FIQ enabling).
arch/arm/src/rm57/rm57_irq.c	Implements VIM initialization and IRQ/FIQ decoding + enable/disable.
arch/arm/src/rm57/rm57_timerisr.c	RTI1 compare-based system tick ISR and timer setup.
arch/arm/src/rm57/rm57_lowputc.h	Declares early console init and SCI configuration routine.
arch/arm/src/rm57/rm57_lowputc.c	Implements low-level console output and SCI configuration/init.
arch/arm/src/rm57/rm57_serial.c	SCI1 serial driver (interrupt-driven) and UART registration.
arch/arm/src/rm57/rm57_gio.h	GIO pinset encoding and API definitions.
arch/arm/src/rm57/rm57_gio.c	GIO init/config/read/write implementation.
arch/arm/src/rm57/rm57_esm.h	Declares early ESM quiesce function.
arch/arm/src/rm57/rm57_esm.c	Implements early ESM quiesce/init sequence.
arch/arm/src/rm57/hardware/rm57l843_memorymap.h	Defines RM57L843 peripheral base addresses and memory map.
arch/arm/src/rm57/hardware/rm57_vim.h	VIM register definitions and helpers.
arch/arm/src/rm57/hardware/rm57_sys.h	SYS module register definitions (PLL/clock/memory init).
arch/arm/src/rm57/hardware/rm57_sci.h	SCI register definitions, flags, and interrupt vector codes.
arch/arm/src/rm57/hardware/rm57_rti.h	RTI register definitions used for the system tick.
arch/arm/src/rm57/hardware/rm57_pcr.h	PCR register definitions used for peripheral power/clocks.
arch/arm/src/rm57/hardware/rm57_gio.h	GIO register definitions and helpers.
arch/arm/src/rm57/hardware/rm57_flash.h	Flash wrapper register definitions for wait-state configuration.
arch/arm/src/rm57/hardware/rm57_esm.h	ESM register definitions used during early quiesce/init.

---

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[acassis]

@daftie-zami amazing work! Please add a basic Documentation about this new arch/board. Please use the Documentation/contributing/doc_templates/board.rst as reference

[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• arduino-mega2560
• esp32-devkitc
• hifive1-revb
• mirtoo
• qemu-armv8a
• qemu-intel64
• rx65n-rsk2mb
• s698pm-dkit
• stm32-nucleo-f103rb

[xiaoxiang781216]

@daftie-zami please drop merge patch from PR.

[acassis]

@daftie-zami please drop merge patch from PR.

@daftie-zami instead using merge you should use git rebase

[daftie-zami]

@daftie-zami amazing work! Please add a basic Documentation about this new arch/board. Please use the Documentation/contributing/doc_templates/board.rst as reference

Thanks for the review. I ve applied the requested changes.

[daftie-zami]

Since the RM57L843 MCU includes a rich set of safety features, do you think it would make sense to add those to NuttX as well?

[acassis]

Since the RM57L843 MCU includes a rich set of safety features, do you think it would make sense to add those to NuttX as well?

Yes, it could be a good idea!

[daftie-zami]

Sorry for the another push i fixed the ci issue's