[DO NOT MERGE]os/board/rtl8730e: Add recovery mechanism for IPC hang

build/tools/amebasmart/gnu_utility/km0_km4_app_RELEASE_NOTE.txt

@@ -1,5 +1,8 @@
 /* == "version" + "Realtek git version" + "compile date" + "compile time" == */
 
+== version 4d319ca58b 2026/03/19-17:20:22 ==
+1. Add recovery mechanism for IPC dev
+
 == version 4d319ca58b 2026/02/12-20:08:13 ==
 1. Prefer 5GHz network when both 2.4GHz and 5GHz are available on same shared SSID
 

os/arch/arm/src/amebasmart/amebasmart_reboot_reason.c

@@ -81,6 +81,10 @@ static reboot_reason_code_t up_reboot_reason_get_hw_value(void)
 			BKUP_Write(BKUP_REG2, 0);
 			boot_reason = REBOOT_SYSTEM_NP_LP_FAULT;
 		}
+		else if (boot_reason_reg2 == 0x5) {
+			BKUP_Write(BKUP_REG2, 0);
+			boot_reason = REBOOT_SYSTEM_CA32_IPC_ERROR;
+		}
 		return boot_reason;
 	} else {
 		/* Read AmebaSmart Boot Reason, WDT and HW reset supported */
@@ -141,7 +145,13 @@ static reboot_reason_code_t up_reboot_reason_get_hw_value(void)
 			if (boot_reason & AON_BIT_RSTF_APSYS) {			/* CA32 */
 				lldbg("Reboot reason: APSYS reset\n");
 			} else if (boot_reason & AON_BIT_RSTF_NPSYS) {	/* KM4 */
-				lldbg("Reboot reason: NPSYS reset\n");
+				if (boot_reason_reg2 == 0x4) {
+					BKUP_Write(BKUP_REG2, 0);
+					lldbg("Reboot reason: KM4 IPC error\n");
+				}
+				else {
+					lldbg("Reboot reason: NPSYS reset\n");
+				}
 			} else {										/* (boot_reason & AON_BIT_RSTF_LPSYS) */
 				lldbg("Reboot reason: LPSYS reset\n");
 			}

os/arch/arm/src/amebasmart/amebasmart_reboot_reason.h

@@ -28,6 +28,7 @@ enum {
 	REBOOT_SYSTEM_TZWD_RESET     = REBOOT_BOARD_SPECIFIC4, /* TrustZone Watch dog */
 	REBOOT_SYSTEM_NP_LP_FAULT    = REBOOT_BOARD_SPECIFIC5, /* Reset due to fault in KM4/KM0 */
 	REBOOT_SYSTEM_RESET_IWDG     = REBOOT_BOARD_SPECIFIC6, /* System reset by IWDG*/
+	REBOOT_SYSTEM_CA32_IPC_ERROR = REBOOT_BOARD_SPECIFIC7, /* CA32 reset due to error in CA32 IPC */
 };
 
 #endif /* __AMEBASMART_REBOOT_REASON_H__ */

os/board/rtl8730e/src/component/wifi/inic/inic_ipc_host_api.c

@@ -460,6 +460,8 @@ int inic_ipc_api_host_message_send(u32 id, u32 *param_buf, u32 buf_len)
 		}
 		if (cnt == 0) {
 			dbg_noarg("HstMsgSend wait inic ipc done 0x%x, 0x%x\n", g_host_ipc_api_request_info.API_ID, latest_api_id);
+			/* Indicate to KM4 that host IPC is stuck waiting for ACK */
+			BKUP_Write(BKUP_REG2, 0x4);
 		}
 	}
 	ret = g_host_ipc_api_request_info.ret;

os/board/rtl8730e/src/rtl8730e_boot.c

@@ -382,7 +382,8 @@ static void np_lp_status_timer_hdl(void)
 {
 	/* Added to inspect the value of BKUP_REG2 */
 	u32 boot_reason_reg2 = BKUP_Read(BKUP_REG2);
-	if (boot_reason_reg2 != 0x0) {
+	/* Catch fault in NP/LP, 0x1 indicates hard fault, 0x5 indicates IPC dev waiting for ACK */
+	if (boot_reason_reg2 == 0x1 || boot_reason_reg2 == 0x5) {
 		lldbg("boot_reason_reg2 0x%x \n", boot_reason_reg2);
 		ASSERT(boot_reason_reg2 == 0x0);
 	}