[platform] fix the dgetc signature problem

platform/armemu/debug.c

@@ -32,15 +32,21 @@ void _dputc(char c)
 	*REG8(DEBUG_STDOUT) = c;
 }
 
-int dgetc(char *c)
+int dgetc(char *c, bool wait)
 {
-	int8_t result = (int8_t)*REG8(DEBUG_STDIN);
+	for (;;) {
+		int8_t result = (int8_t)*REG8(DEBUG_STDIN);
 
-	if (result == -1)
-		return -1;
+		if (result == -1) {
+			if (wait)
+				continue;
+			else
+				return -1;
+		}
 
-	*c = (char)result;
-	return 0;
+		*c = (char)result;
+		return 0;
+	}
 }
 
 void debug_dump_regs(void)

platform/integrator/debug.c

@@ -98,7 +98,7 @@ void _dputc(char c)
 	uart_putc(0, c);
 }
 
-int dgetc(char *c)
+int dgetc(char *c, bool wait)
 {
 	int result = uart_getc(0, false);
 

platform/msm_shared/debug.c

@@ -51,7 +51,7 @@ void _dputc(char c)
 #endif
 }
 
-int dgetc(char *c)
+int dgetc(char *c, bool wait)
 {
 	int n;
 #if WITH_DEBUG_DCC

platform/omap3/debug.c

@@ -37,7 +37,7 @@ void _dputc(char c)
 	uart_putc(DEBUG_UART, c);
 }
 
-int dgetc(char *c)
+int dgetc(char *c, bool wait)
 {
 	int _c;