be30590504
Introduce minimal chip support for the STMicro STM32N6 family
(Cortex-M55, ARMv8.1-M with TrustZone and FPU), sufficient to bring
up an NSH console over USART1.
Scope (deliberately minimal first drop):
- Chip selector ARCH_CHIP_STM32N6 wired into arch/arm/Kconfig and
chip-name mapping ("stm32n6").
- Sub-Kconfig under arch/arm/src/stm32n6 with the STM32N657X0 chip
selector and a single user-selectable USART (USART1).
- Boot path: stm32_start with a naked dispatcher that clears the
boot-ROM MSPLIM/PSPLIM stack limits before any compiler-emitted
prologue, then runs vector relocation and SRAM-only heap init.
The chip runs entirely in the Secure state; SAU is left in its
reset configuration.
- PLL1-based clock tree fed from HSI64 targeting 200 MHz CPU, with
USART1 kernel-clock routed to HSI for a predictable BRR that is
independent of any later clock change.
- Low-level USART driver with full serial framework support.
stm32_serial.c is adapted from arch/arm/src/stm32h5/stm32_serial.c
(sibling ARMv8-M Mainline port with the same USART IP), stripped
of DMA-RX, LPUART, the per-USART2..5 plumbing, RS-485 driver-enable,
TIOCSINVERT/SWAP and HALFDUPLEX paths.
- SysTick system timer.
- GPIO, PWR and RCC helpers.
TrustZone, MPU, I/D-cache and Helium (MVE) are left disabled to
minimise bring-up surface; these will be added in follow-up patches
alongside the drivers that need them.
Signed-off-by: ImBonkers <samuelnlinden@pm.me>
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| .github | ||
| arch | ||
| audio | ||
| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
| .codespellrc | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
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The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.