diff --git a/arch/risc-v/src/litex/litex_cache.S b/arch/risc-v/src/litex/litex_cache.S
index 37bb1d65b82e9..2820a3843194d 100644
--- a/arch/risc-v/src/litex/litex_cache.S
+++ b/arch/risc-v/src/litex/litex_cache.S
@@ -56,6 +56,28 @@ up_invalidate_dcache_all:
   .word 0x500F
 #endif
 
+/****************************************************************************
+ * Name: up_flush_dcache_all
+ *
+ * Description:
+ *   Flush the entire contents of D cache.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_ARCH_DCACHE
+  .globl  up_flush_dcache_all
+  .type   up_flush_dcache_all, function
+
+up_flush_dcache_all:
+  .word 0x500F
+#endif
+
 /****************************************************************************
  * Name: up_invalidate_icache_all
  *