diff --git a/bootrom/sdboot/sd.c b/bootrom/sdboot/sd.c
index 97cd82d..ba99f21 100644
--- a/bootrom/sdboot/sd.c
+++ b/bootrom/sdboot/sd.c
@@ -10,7 +10,11 @@
 
 #define MAX_CORES 8
 
-#define PAYLOAD_SIZE	(16 << 11)
+//#define PAYLOAD_START 0
+//#define PAYLOAD_CRC7 0xE1
+#define PAYLOAD_START 2048
+#define PAYLOAD_CRC7 0x51
+#define PAYLOAD_SIZE	(16 << 12)
 
 #define F_CLK 60000000UL
 
@@ -163,7 +167,7 @@ static int copy(void)
 	kprintf("LOADING  ");
 
 	REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 20000000UL);
-	if (sd_cmd(0x52, 0, 0xE1) != 0x00) {
+	if (sd_cmd(0x52, PAYLOAD_START, PAYLOAD_CRC7) != 0x00) {
 		sd_cmd_end();
 		return 1;
 	}