fix bug of smp startup from Wa_Weigen and Huang_Yuqing

it is OK

arch/risc-v/k210/boot.S

@@ -70,13 +70,13 @@ _begin:
   j    Kd233Start
 
 
-#ifdef ARCH_SMP
+
 .data
 .globl cpu2_boot_flag
 .align 3
 cpu2_boot_flag:
     .8byte 0
-#endif
+
 
 .section      .text.entry
 .align 2

board/aiit-riscv64-board/board.c

@@ -84,14 +84,17 @@ void Kd233Start(uint32_t mhartid)
 			/*kernel start entry*/
     		entry();
 			break;
-#ifdef ARCH_SMP
 		case CPU1:
 			while(0x2018050420191010 != cpu2_boot_flag) { ///< waiting for boot flag ,then start cpu1 core
-				
+#ifndef ARCH_SMP
-			}
+				asm volatile("wfi");
-			SecondaryCpuCStart();
-			break;
 #endif
+			}
+#ifdef ARCH_SMP
+			SecondaryCpuCStart();
+#endif
+			break;
+
 		default:
 			break;
 	}

board/k210-emulator/board.c

@@ -82,14 +82,18 @@ void Kd233Start(uint32_t mhartid)
 			/*kernel start entry*/
     		entry();
 			break;
-#ifdef ARCH_SMP
+
 		case CPU1:
 			while(0x2018050420191010 != cpu2_boot_flag) { ///< waiting for boot flag ,then start cpu1 core
-				
+#ifndef ARCH_SMP
-			}
+				asm volatile("wfi");
-			SecondaryCpuCStart();
-			break;
 #endif
+			}
+#ifdef ARCH_SMP
+			SecondaryCpuCStart();
+#endif
+			break;
+
 		default:
 			break;
 	}

board/kd233/board.c

@@ -81,14 +81,17 @@ void Kd233Start(uint32_t mhartid)
 			/*kernel start entry*/
     		entry();
 			break;
-#ifdef ARCH_SMP
 		case CPU1:
 			while(0x2018050420191010 != cpu2_boot_flag) { ///< waiting for boot flag ,then start cpu1 core
-				
+#ifndef ARCH_SMP
-			}
+				asm volatile("wfi");
-			SecondaryCpuCStart();
-			break;
 #endif
+			}
+#ifdef ARCH_SMP
+			SecondaryCpuCStart();
+#endif
+			break;
+
 		default:
 			break;
 	}

board/maix-go/board.c

@@ -77,14 +77,17 @@ void Kd233Start(uint32_t mhartid)
 			/*kernel start entry*/
     		entry();
 			break;
-#ifdef ARCH_SMP
 		case CPU1:
 			while(0x2018050420191010 != cpu2_boot_flag) { ///< waiting for boot flag ,then start cpu1 core
-				
+#ifndef ARCH_SMP
-			}
+				asm volatile("wfi");
-			SecondaryCpuCStart();
-			break;
 #endif
+			}
+#ifdef ARCH_SMP
+			SecondaryCpuCStart();
+#endif
+			break;
+
 		default:
 			break;
 	}