diff --git a/board/kontron/sl28/ddr.c b/board/kontron/sl28/ddr.c
index 41426996ab..d75b23e54c 100644
--- a/board/kontron/sl28/ddr.c
+++ b/board/kontron/sl28/ddr.c
@@ -54,6 +54,9 @@ static fsl_ddr_cfg_regs_t __maybe_unused ddr_cfg_regs = {
 
 	.ddr_cdr1		= 0x80040000,
 	.ddr_cdr2		= 0x0000bc01,
+
+	/* Erratum A-009942, set optimal CPO value */
+	.debug[28]		= 0x00700040,
 };
 
 int fsl_initdram(void)