diff --git a/arch/arm64/src/imx9/imx9_flexspi_nor.c b/arch/arm64/src/imx9/imx9_flexspi_nor.c
index f117207d612b2..bc4ac01afe78b 100644
--- a/arch/arm64/src/imx9/imx9_flexspi_nor.c
+++ b/arch/arm64/src/imx9/imx9_flexspi_nor.c
@@ -790,12 +790,15 @@ static ssize_t imx9_flexspi_nor_read(struct mtd_dev_s *dev,
     }
 
   src = priv->ahb_base + offset;
-  DEBUGASSERT(((uintptr_t)src & ALIGN_MASK) == 0);
 
   up_invalidate_dcache((uintptr_t)buffer,
                        (uintptr_t)buffer + ALIGN_UP(nbytes));
+  int n = nbytes;
 
-  memcpy(buffer, src, nbytes);
+  while (n-- > 0)
+    {
+      *buffer++ = *src++;
+    }
 
   up_clean_dcache((uintptr_t)buffer, (uintptr_t)buffer + ALIGN_UP(nbytes));