Wire the RTL8721F km4tz core up to a working NuttShell:
- irq.h: renumber the KM4TZ external vector table to the RTL8721F
APIRQn map (UART_LOG=24, IPC=5, +GPIOB/C, TIMER7/8, ...).
- ameba_loguart.c: fix the LOG-UART base to 0x40810000. The former
0x401C6000 belongs to a different Ameba part; the wrong base bus-
faulted on the RX interrupt-enable write while TX still worked
(LOGUART_PutChar uses its own ROM-internal base).
- ameba_app_start.c: adjust the MPU read-only / RAM regions for the
RTL8721F memory map and seed the RTC on first power-on so the
SDM32K-clocked SYSTIMER comes up (mirrors the SDK app_rtc_init).
- ameba_ipc.c: move the km4tz<->km4ns IPC to APIRQn 5 (IPC_CPU0).
- ameba_board.mk: pull in fwlib ameba_rtc.c for the RTC_* symbols.
- defconfig: RTL8721F RAM map, enable TIMER/TIMER_ARCH/ARMV8M_SYSTICK
for a live system tick, and drop the WiFi/NET stack for now.
- scripts/Make.defs: use the RTL8721F_NOR flash profile.
Boots cleanly to nsh> on hardware; tick, RX and builtin apps verified.
Signed-off-by: dechao_gong <dechao_gong@realsil.com.cn>
Add a P0 skeleton port for the Realtek RTL8721F (SDK codename Green2 /
amebagreen2). Structurally the RTL8721F is a twin of the RTL8720F -- the
AP/host core is km4tz (ARMv8-M.main, TrustZone secure) and the WiFi MAC/PHY
runs on the km4ns network-processor core -- so this port is modelled on the
RTL8720F one and shares the IC-agnostic ameba glue in
arch/arm/src/common/ameba.
This is the "configures and links" skeleton (rtl8721f_evb:nsh builds an
image end to end). Four differences from the RTL8720F template were needed
to make the empty shell link against amebagreen2:
* km4tz has no FPU (cmsis_cpu.h defines __FPU_PRESENT 0), so the chip does
not select ARCH_HAVE_FPU and the image is built soft-float.
* ameba_app_start.c matches amebagreen2's ram_km4tz silicon init: the
nocache MPU map, the non-secure ROM BSS clear, OSC4M (not OSC2M)
calibration gated on EFUSE cut >= B and CHIP_TYPE_ASIC_POSTSIM.
* amebagreen2 ships no lib_rom.a, so the ROM archive whole-archive link is
dropped; the WiFi/OS/non-secure ROM symbols come from the SDK
ameba_rom_symbol_acut{,_wifi,_os}.ld maps appended to the image2 linker
script, exactly as green2's own image2 link does.
* the AP WiFi security lib is lib_wifi_common.a (was lib_wifi_com_sec.a).
The per-chip IRQ vector table (irq.h) and the RAM_START/RAM_SIZE layout
still carry RTL8720F values and are refined in the follow-up bring-up work.
Signed-off-by: dechao_gong <dechao_gong@realsil.com.cn>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
