diff --git a/tools/rkcommon.c b/tools/rkcommon.c
index 18778aa..249c862 100644
--- a/tools/rkcommon.c
+++ b/tools/rkcommon.c
@@ -25,7 +25,7 @@
  *
  * @signature:		Signature (must be RKSD_SIGNATURE)
  * @disable_rc4:	0 to use rc4 for boot image,  1 to use plain binary
- * @code1_offset:	Offset in blocks of the SPL code from this header
+ * @init_offset:	Offset in blocks of the SPL code from this header
  *			block. E.g. 4 means 2KB after the start of this header.
  * Other fields are not used by U-Boot
  */
@@ -33,11 +33,10 @@
 	uint32_t signature;
 	uint8_t reserved[4];
 	uint32_t disable_rc4;
-	uint16_t code1_offset;
-	uint16_t code2_offset;
-	uint8_t reserved1[490];
-	uint16_t usflashdatasize;
-	uint16_t ucflashbootsize;
+	uint16_t init_offset;
+	uint8_t reserved1[492];
+	uint16_t init_size;
+	uint16_t init_boot_size;
 	uint8_t reserved2[2];
 };
 
@@ -53,18 +52,15 @@
 	if (file_size > CONFIG_ROCKCHIP_MAX_SPL_SIZE)
 		return -ENOSPC;
 
-	memset(buf,  '\0', RK_CODE1_OFFSET * RK_BLK_SIZE);
+	memset(buf,  '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
 	hdr = (struct header0_info *)buf;
 	hdr->signature = RK_SIGNATURE;
 	hdr->disable_rc4 = 1;
-	hdr->code1_offset = RK_CODE1_OFFSET;
-	hdr->code2_offset = 8;
+	hdr->init_offset = RK_INIT_OFFSET;
 
-	hdr->usflashdatasize = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE;
-	hdr->usflashdatasize = (hdr->usflashdatasize + 3) & ~3;
-	hdr->ucflashbootsize = hdr->usflashdatasize;
-
-	debug("size=%x, %x\n", params->file_size, hdr->usflashdatasize);
+	hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE;
+	hdr->init_size = (hdr->init_size + 3) & ~3;
+	hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;
 
 	rc4_encode(buf, RK_BLK_SIZE, rc4_key);
 
diff --git a/tools/rkcommon.h b/tools/rkcommon.h
index 39b1d52..0fc1e96 100644
--- a/tools/rkcommon.h
+++ b/tools/rkcommon.h
@@ -10,7 +10,8 @@
 
 enum {
 	RK_BLK_SIZE		= 512,
-	RK_CODE1_OFFSET		= 4,
+	RK_INIT_OFFSET		= 4,
+	RK_MAX_BOOT_SIZE	= 512 << 10,
 };
 
 /**
diff --git a/tools/rksd.c b/tools/rksd.c
index 30b149d..f660d56 100644
--- a/tools/rksd.c
+++ b/tools/rksd.c
@@ -14,7 +14,7 @@
 #include "rkcommon.h"
 
 enum {
-	RKSD_SPL_HDR_START	= RK_CODE1_OFFSET * RK_BLK_SIZE,
+	RKSD_SPL_HDR_START	= RK_INIT_OFFSET * RK_BLK_SIZE,
 	RKSD_SPL_START		= RKSD_SPL_HDR_START + 4,
 	RKSD_HEADER_LEN		= RKSD_SPL_START,
 };
diff --git a/tools/rkspi.c b/tools/rkspi.c
index 13cc593..69a12f0 100644
--- a/tools/rkspi.c
+++ b/tools/rkspi.c
@@ -14,7 +14,7 @@
 #include "rkcommon.h"
 
 enum {
-	RKSPI_SPL_HDR_START	= RK_CODE1_OFFSET * RK_BLK_SIZE,
+	RKSPI_SPL_HDR_START	= RK_INIT_OFFSET * RK_BLK_SIZE,
 	RKSPI_SPL_START		= RKSPI_SPL_HDR_START + 4,
 	RKSPI_HEADER_LEN	= RKSPI_SPL_START,
 	RKSPI_SECT_LEN		= RK_BLK_SIZE * 4,