diff --git a/tools/rockchip/boot_merger.c b/tools/rockchip/boot_merger.c
index eec0b3c2c3..48c87530c9 100644
--- a/tools/rockchip/boot_merger.c
+++ b/tools/rockchip/boot_merger.c
@@ -26,6 +26,7 @@ char gSubfix[MAX_LINE_LEN] = OUT_SUBFIX;
 char gEat[MAX_LINE_LEN];
 char *gConfigPath;
 uint8_t *gBuf;
+bool enableRC4 = false;
 
 static uint32_t g_merge_max_size = MAX_MERGE_SIZE;
 
@@ -770,9 +771,8 @@ static inline void getBoothdr(rk_boot_header *hdr)
 	hdr->loaderNum = gOpts.loaderNum;
 	hdr->loaderOffset = hdr->code472Offset + gOpts.code472Num * hdr->code472Size;
 	hdr->loaderSize = sizeof(rk_boot_entry);
-#ifndef USE_P_RC4
-	hdr->rc4Flag = 1;
-#endif
+	if (!enableRC4)
+		hdr->rc4Flag = 1;
 }
 
 static inline uint32_t getCrc(const char *path)
@@ -1021,6 +1021,9 @@ int main(int argc, char **argv)
 			merge = true;
 		} else if (!strcmp(OPT_UNPACK, argv[i])) {
 			merge = false;
+		} else if (!strcmp(OPT_RC4, argv[i])) {
+			printf("enable RC4 for IDB data(both ddr and preloader)\n");
+			enableRC4 = true;
 		} else if (!strcmp(OPT_SUBFIX, argv[i])) {
 			i++;
 			snprintf(gSubfix, sizeof(gSubfix), "%s", argv[i]);
diff --git a/tools/rockchip/boot_merger.h b/tools/rockchip/boot_merger.h
index 97586d7cba..3c31b782b1 100644
--- a/tools/rockchip/boot_merger.h
+++ b/tools/rockchip/boot_merger.h
@@ -188,6 +188,7 @@ typedef struct {
 #define OPT_REPLACE         "--replace"
 #define OPT_PREPATH         "--prepath"
 #define OPT_SIZE	    "--size"
+#define OPT_RC4		    "--rc4"
 
 #define OPT_CHIP	"-c"
 #define OPT_471		"-1"