diff --git a/serde/src/de/impls.rs b/serde/src/de/impls.rs
index 7dd5c61c..915b53a7 100644
--- a/serde/src/de/impls.rs
+++ b/serde/src/de/impls.rs
@@ -3221,3 +3221,143 @@ impl<'de> Visitor<'de> for ErrnoVisitor {
         }
     }
 }
+
+
+variant_identifier! {
+    FileCreationModeKind (NoCreate; b"NoCreate"; 0, Create; b"Create"; 1, ForceCreate; b"ForceCreate"; 2)
+    "`NoCreate` or `Create` or `ForceCreate`",
+    FILE_CREATION_MODE_VARIANTS
+}
+
+
+#[cfg(target_os = "mikros")]
+impl<'de> Deserialize<'de> for std::os::mikros::FileCreationMode {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_enum("FileCreationMode", &["NoCreate", "Create", "ForceCreate"], FileCreationModeVisitor)
+    }
+}
+
+#[cfg(target_os = "mikros")]
+struct FileCreationModeVisitor;
+
+#[cfg(target_os = "mikros")]
+impl<'de> Visitor<'de> for FileCreationModeVisitor {
+    type Value = std::os::mikros::FileCreationMode;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("FileCreationMode")
+    }
+
+    fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+    where
+        A: EnumAccess<'de>,
+    {
+        match tri!(data.variant()) {
+            (FileCreationModeKind::NoCreate,v) => v.unit_variant().map(|_| std::os::mikros::FileCreationMode::NoCreate),
+            (FileCreationModeKind::Create,v) => v.unit_variant().map(|_| std::os::mikros::FileCreationMode::Create),
+            (FileCreationModeKind::ForceCreate,v) => v.unit_variant().map(|_| std::os::mikros::FileCreationMode::ForceCreate),
+        }
+    }
+}
+
+variant_identifier! {
+    FileWriteModeKind (Start; b"Start"; 0, Truncate; b"Truncate"; 1, Append; b"Append"; 2)
+    "`Start` or `Truncate` or `Append`",
+    FILE_WRITE_MODE_VARIANTS
+}
+
+
+#[cfg(target_os = "mikros")]
+impl<'de> Deserialize<'de> for std::os::mikros::FileWriteMode {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_enum("FileWriteMode", &["Start", "Truncate", "Append"], FileWriteModeVisitor)
+    }
+}
+
+#[cfg(target_os = "mikros")]
+struct FileWriteModeVisitor;
+
+#[cfg(target_os = "mikros")]
+impl<'de> Visitor<'de> for FileWriteModeVisitor {
+    type Value = std::os::mikros::FileWriteMode;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("FileWriteMode")
+    }
+
+    fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+    where
+        A: EnumAccess<'de>,
+    {
+        match tri!(data.variant()) {
+            (FileWriteModeKind::Start,v) => v.unit_variant().map(|_| std::os::mikros::FileWriteMode::Start),
+            (FileWriteModeKind::Truncate,v) => v.unit_variant().map(|_| std::os::mikros::FileWriteMode::Truncate),
+            (FileWriteModeKind::Append,v) => v.unit_variant().map(|_| std::os::mikros::FileWriteMode::Append),
+        }
+    }
+}
+
+
+#[cfg(target_os = "mikros")]
+struct FileOpenModeTupleVisitor;
+
+
+#[cfg(target_os = "mikros")]
+impl<'de> Visitor<'de> for FileOpenModeTupleVisitor {
+    type Value = (std::os::mikros::FileWriteMode, std::os::mikros::FileCreationMode);
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("(FileWriteMode, FileCreationMode)")
+    }
+
+    fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+    where
+        A: SeqAccess<'de>,
+    {
+        let wr_mode = match tri!(seq.next_element()) {
+            Some(x) => x,
+            None => return Err(Error::invalid_length(2, &self)),
+        };
+        let cr_mode =  match tri!(seq.next_element()) {
+            Some(x) => x,
+            None => return Err(Error::invalid_length(2, &self)),
+        };
+        Ok((wr_mode, cr_mode))
+    }
+
+}
+
+variant_identifier! {
+    FileOpenModeKind (Read; b"Read"; 0, Write; b"Write"; 1, ReadWrite; b"ReadWrite"; 2)
+    "`Read` or `Write` or `ReadWrite`",
+    FILE_OPEN_MODE_VARIANTS
+}
+
+#[cfg(target_os = "mikros")]
+struct FileOpenModeVisitor;
+
+#[cfg(target_os = "mikros")]
+impl<'de> Visitor<'de> for FileOpenModeVisitor {
+    type Value = std::os::mikros::FileOpenMode;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("FileOpenMode")
+    }
+
+    fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+    where
+        A: EnumAccess<'de>,
+    {
+        match tri!(data.variant()) {
+            (FileOpenModeKind::Read,v) => v.unit_variant().map(|_| std::os::mikros::FileOpenMode::Read),
+            (FileOpenModeKind::Write,v) => v.tuple_variant(2, FileOpenModeTupleVisitor).map(|(x,y)| std::os::mikros::FileOpenMode::Write(x,y)),
+            (FileOpenModeKind::ReadWrite,v) => v.tuple_variant(2, FileOpenModeTupleVisitor).map(|(x,y)| std::os::mikros::FileOpenMode::ReadWrite(x,y)),
+        }
+    }
+}
diff --git a/serde/src/ser/impls.rs b/serde/src/ser/impls.rs
index bb3e27b4..af2593fa 100644
--- a/serde/src/ser/impls.rs
+++ b/serde/src/ser/impls.rs
@@ -1,6 +1,6 @@
 use crate::lib::*;
 
-use crate::ser::{Error, Serialize, SerializeTuple, Serializer};
+use crate::ser::{Error, Serialize, SerializeTuple, SerializeTupleVariant, Serializer};
 
 ////////////////////////////////////////////////////////////////////////////////
 
@@ -1111,3 +1111,59 @@ impl Serialize for std::os::mikros::Errno {
         (*self as i32).serialize(serializer)
     }
 }
+
+#[cfg(target_os = "mikros")]
+impl Serialize for std::os::mikros::FileCreationMode {
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match self {
+            Self::NoCreate => serializer.serialize_unit_variant("FileCreationMode", 0, "NoCreate"),
+            Self::Create => serializer.serialize_unit_variant("FileCreationMode", 1, "Create"),
+            Self::ForceCreate => serializer.serialize_unit_variant("FileCreationMode", 2, "ForceCreate"),
+        }
+    }
+}
+
+#[cfg(target_os = "mikros")]
+impl Serialize for std::os::mikros::FileWriteMode {
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match self {
+            Self::Start => serializer.serialize_unit_variant("FileWriteMode", 0, "Start"),
+            Self::Truncate => serializer.serialize_unit_variant("FileWriteMode", 1, "Truncate"),
+            Self::Append => serializer.serialize_unit_variant("FileWriteMode", 2, "Append"),
+        }
+    }
+}
+
+#[cfg(target_os = "mikros")]
+impl Serialize for std::os::mikros::FileOpenMode {
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        match self {
+            Self::Read => serializer.serialize_unit_variant("FileOpenMode", 0, "Read"),
+            Self::Write(ref wr_mode, ref cr_mode) => {
+                let mut tv = serializer.serialize_tuple_variant("FileOpenMode", 1, "Write", 2)?;
+                tv.serialize_field(wr_mode)?;
+                tv.serialize_field(cr_mode)?;
+                tv.end()
+            },
+            Self::ReadWrite(ref wr_mode, ref cr_mode) => {
+                let mut tv = serializer.serialize_tuple_variant("FileOpenMode", 2, "ReadWrite", 2)?;
+                tv.serialize_field(wr_mode)?;
+                tv.serialize_field(cr_mode)?;
+                tv.end()
+            },
+
+        }
+    }
+}