diff --git a/fpga/src/main/resources/vcu118/sdboot/sd.c b/fpga/src/main/resources/vcu118/sdboot/sd.c
index f1bdb61e..60bebbd8 100644
--- a/fpga/src/main/resources/vcu118/sdboot/sd.c
+++ b/fpga/src/main/resources/vcu118/sdboot/sd.c
@@ -22,7 +22,7 @@
 #error Must define TL_CLK
 #endif
 
-#define F_CLK TL_CLK
+#define F_CLK (TL_CLK)
 
 static volatile uint32_t * const spi = (void *)(SPI_CTRL_ADDR);
 
@@ -79,7 +79,9 @@ static inline void sd_cmd_end(void)
 static void sd_poweron(void)
 {
 	long i;
-	REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 300000UL);
+	// HACK: frequency change
+	// REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 300000UL);
+	REG32(spi, SPI_REG_SCKDIV) = (F_CLK * 2.5);
 	REG32(spi, SPI_REG_CSMODE) = SPI_CSMODE_OFF;
 	for (i = 10; i > 0; i--) {
 		sd_dummy();
@@ -176,7 +178,9 @@ static int copy(void)
 
 	// TODO: Speed up SPI freq. (breaks between these two values)
 	//REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 16666666UL);
-	REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 5000000UL);
+	// HACK: frequency change
+	// REG32(spi, SPI_REG_SCKDIV) = (F_CLK / 5000000UL);
+	REG32(spi, SPI_REG_SCKDIV) = (F_CLK * 2); //  / 0.5
 	if (sd_cmd(0x52, BBL_PARTITION_START_SECTOR, 0xE1) != 0x00) {
 		sd_cmd_end();
 		return 1;