dcgong2917 opened a new pull request, #19575:
URL: https://github.com/apache/nuttx/pull/19575
## Summary
Add initial NuttX support for the Realtek RTL8721F, a dual-core
Cortex-M55 (KM4 TrustZone) + Cortex-M55 (KM4 NS) SoC targeting
Wi-Fi 6 / Bluetooth 5.3 IoT applications. The RTL8721F belongs to
the amebagreen2 SoC family alongside the already-merged RTL8720F;
chip-specific constants substituted.
- arch/arm/include/rtl8721f/irq.h: full 109-entry IRQ table compiled
from the RTL8721F TRM; differs from RTL8720F in peripheral numbering.
- arch/arm/src/rtl8721f/ameba_app_start.c: NuttX-owned image2 entry
running OS-independent silicon init (cache, BSS clear, LOGUART,
data-flash high-speed setup, OSC calibration, SDM32K/RTC system
timer, pinmap, MPU) before calling NuttX main(). Owning this file
keeps the vendor SDK pristine.
- arch/arm/src/rtl8721f/: ameba_loguart.c, ameba_irq.c, ameba_start.c,
ameba_timerisr.c, ameba_allocateheap.c, ameba_ipc.c — standard NuttX
ARM bring-up adapted to the RTL8721F memory map and boot flow.
- arch/arm/src/rtl8721f/ameba_board.mk: SDK fwlib source list and
linker flags for the RTL8721F image2 build.
- arch/arm/src/rtl8721f/ameba_wifi_init.c: wires the Ameba Wi-Fi upper
half into NuttX netdev at bring-up.
- boards/arm/rtl8721f/rtl8721f_evb: board Kconfig, defconfig (nsh),
board.h pin table, boot and bringup hooks, LittleFS on internal
4 MiB flash (/dev/mtd0 -> /mnt/lfs).
- tools/nxstyle.c: whitelist RTL8721F-specific Realtek SDK ROM/HAL
symbol prefixes (RTC_, EFUSE_, SDM32K_, Get_OSC131_, Set_OSC131_)
that cannot be renamed without breaking linkage against the vendor
blob; extends the existing Ameba SDK comment block.
- Documentation/platforms/arm/rtl8721f/: platform overview (memory map,
peripheral list, toolchain, flash procedure) and EVB board page.
## Impact
- New platform: arch/arm/src/rtl8721f/ and boards/arm/rtl8721f/ are
entirely new directories; no existing platform is modified.
- tools/nxstyle.c: five new Ameba SDK prefixes added to the whitelist
inside the existing Ameba comment block; no behavioural change for
any other platform.
- arch/arm/Kconfig and boards/Kconfig: new ARCH_CHIP_RTL8721F and
ARCH_BOARD_RTL8721F_EVB entries appended; no existing entries changed.
## Testing
Built for `rtl8721f_evb:nsh` and verified on hardware (RTL8721F EVB):
- NSH boots to prompt over LOGUART at 115200 baud.
- LittleFS mounts on internal 4 MiB flash; file create/read across
power cycles confirmed.
- Wi-Fi association, DHCP lease and ping to 8.8.8.8 pass end-to-end.
- `tools/checkpatch.sh` clean on all new/changed sources (0 `error:`
lines); full build produces `nuttx.bin` with no new warnings.
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