dcgong2917 opened a new pull request, #20202:
URL: https://github.com/apache/nuttx/pull/20202
## Summary
Add initial NuttX support for the Realtek RTL8730E, a tri-core SoC
(dual Cortex-A32 "CA32" + Cortex-M33 KM4 + Cortex-M23 KM0) targeting
Wi-Fi 6 / Bluetooth 5.0 applications. NuttX runs on the CA32 application
processor; KM4 and KM0 remain as vendor firmware, with KM4 acting as
the Wi-Fi network processor over the WHC IPC bus.
- arch/arm/src/rtl8730e/: CA32 boot / exception vectors / MMU + page
allocator / heap; LOGUART console with RX delivered via KM0-owned IPC
interrupt (GIC SPI 24) and shared SRAM ring; IRQ controller, system
timer, and serial driver.
- arch/arm/src/rtl8730e/rtl8730e_flash_stubs.c: copies flash_init_para
from KM4 before any SPI NOR access; without it lib_rom.a hangs waiting
for SPIC. SPI NOR MTD wired to littlefs at /data.
- arch/arm/src/rtl8730e/rtl8730e_wifi_stubs.c,
arch/arm/src/common/ameba/ameba_wifi_init.c: WHC-host Wi-Fi netdev
(STA + SoftAP). The NP pushes its real efuse MAC to the host at
wifi-on time; the driver caches it so the netdev MAC and the NP 802.11
RX filter agree (fixes DHCP OFFER loss caused by MAC divergence).
- arch/arm/src/rtl8730e/rtl8730e_smp.c: Core1 HSYS power-on sequence
before PSCI CPU_ON; CONFIG_MM_DEFAULT_ALIGNMENT=64 to satisfy WHC skb
cache-line requirement (without it SMP DDR sharing corrupts skb buf
pointers under concurrent load).
- arch/arm/src/rtl8730e/CMakeLists.txt: full SDK build machinery with
per-toolchain version guard; libameba_fwlib.a / libameba_wifi.a
compiled with isolated flags to avoid NuttX header conflicts.
- boards/arm/rtl8730e/rtl8730e_evb: board Kconfig, nsh defconfig
(dual-core SMP, Wi-Fi STA + SoftAP, DHCP client + server, littlefs
/data, iperf2), board.h pin table, boot and bringup hooks.
- tools/nxstyle.c: whitelist RTL8730E SDK mixed-case symbol prefixes
(CPU_, Diag, TRNG_, System_, vPort) that cannot be renamed without
breaking linkage against the vendor blob; extends the existing Ameba
SDK comment block.
- Documentation/platforms/arm/rtl8730e/: SoC overview (ATF boot chain,
memory map, vendor SDK info, build/flash procedure) and EVB board page.
## Impact
- New platform: arch/arm/src/rtl8730e/ and boards/arm/rtl8730e/ are
entirely new directories; no existing platform is modified.
- arch/arm/src/common/ameba/: three files extended with RTL8730E-specific
guards (CONFIG_AMEBASMART); no behavioural change for RTL8721Dx,
RTL8720F, or RTL8721F builds.
- tools/nxstyle.c: five new 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_RTL8730E and
ARCH_BOARD_RTL8730E_EVB entries appended; no existing entries changed.
## Testing
Built for `rtl8730e_evb:nsh` with both make and cmake, verified on
hardware (RTL8730E EVB):
- NSH boots to prompt over LOG-UART.
- Both CA32 cores online: /proc/cpuinfo shows processor 0 and processor 1;
getprime 2 runs two threads in parallel (~573 ms).
- Wi-Fi STA: scan → connect → DHCP → ping pass end-to-end; ifconfig
shows real Realtek OUI MAC (00:e0:4c:..).
- renew wlan0 stable with SMP enabled (skb alignment fix verified).
- littlefs /data mounts and persists across reboot.
- 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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