diff --git a/litex/soc/software/bios/sdram.c b/litex/soc/software/bios/sdram.c
index 4ffb108e..01f24bfe 100644
--- a/litex/soc/software/bios/sdram.c
+++ b/litex/soc/software/bios/sdram.c
@@ -216,10 +216,10 @@ void sdrwr(char *startaddr)
 #define ERR_DDRPHY_BITSLIP 1
 #else
 #define ERR_DDRPHY_DELAY 32
-#define ERR_DDRPHY_BITSLIP DFII_NPHASES*2
+#define ERR_DDRPHY_BITSLIP DFII_NPHASES*4
 #endif

-#define NBMODULES DFII_PIX_DATA_SIZE*DFII_NPHASES/8
+#define NBMODULES DFII_PIX_DATA_SIZE*DFII_NPHASES/4

 #ifdef CSR_DDRPHY_WLEVEL_EN_ADDR