diff --git a/data/extra/family/STM32F3.yaml b/data/extra/family/STM32F3.yaml
index 84da393..4eafa82 100644
--- a/data/extra/family/STM32F3.yaml
+++ b/data/extra/family/STM32F3.yaml
@@ -6,3 +6,15 @@ peripherals:
       kind: vrefintcal
       version: v1
       block: VREFINTCAL
+  - name: OPAMP2
+    pins:
+      - pin: PA5
+        signal: VM1
+      - pin: PC5
+        signal: VM0
+      - pin: PA7
+        signal: VP0
+      - pin: PD14
+        signal: VP1
+      - pin: PB0
+        signal: VP2
\ No newline at end of file
diff --git a/stm32-data-gen/src/chips.rs b/stm32-data-gen/src/chips.rs
index 01f38bc..82f1ec8 100644
--- a/stm32-data-gen/src/chips.rs
+++ b/stm32-data-gen/src/chips.rs
@@ -927,7 +927,7 @@ fn process_core(
         pins.sort();
         pins.dedup();
     }
-    let mut peripherals = Vec::new();
+    let mut peripherals = HashMap::new();
     for (pname, pkind) in peri_kinds {
         // We cannot add this to FAKE peripherals because we need the pins
         if pname.starts_with("I2S") {
@@ -1045,7 +1045,7 @@ fn process_core(
 
             p.interrupts = Some(irqs);
         }
-        peripherals.push(p);
+        peripherals.insert(p.name.clone(), p);
     }
     if let Ok(extra_f) = std::fs::read(format!("data/extra/family/{}.yaml", group.family.as_ref().unwrap())) {
         #[derive(serde::Deserialize)]
@@ -1054,12 +1054,20 @@ fn process_core(
         }
 
         let extra: Extra = serde_yaml::from_slice(&extra_f).unwrap();
-        for p in extra.peripherals {
-            peripherals.push(p);
+        for mut p in extra.peripherals {
+            if let Some(peripheral) = peripherals.get_mut(&p.name) {
+                // Modify the generated peripheral
+                peripheral.pins.append(&mut p.pins);
+            } else if p.address != 0 {
+                // Only insert the peripheral if the address is not the default
+                peripherals.insert(p.name.clone(), p);
+            }
         }
     }
+
+    let have_peris: HashSet<_> = peripherals.keys().cloned().collect();
+    let mut peripherals: Vec<_> = peripherals.into_values().collect();
     peripherals.sort_by_key(|x| x.name.clone());
-    let have_peris: HashSet<_> = peripherals.iter_mut().map(|p| p.name.clone()).collect();
     // Collect DMA versions in the chip
     let mut chip_dmas: Vec<_> = group
         .ips
diff --git a/stm32-data-serde/src/lib.rs b/stm32-data-serde/src/lib.rs
index b95a3b1..0372c21 100644
--- a/stm32-data-serde/src/lib.rs
+++ b/stm32-data-serde/src/lib.rs
@@ -84,6 +84,7 @@ pub mod chip {
         #[derive(Clone, Debug, Eq, PartialEq, Hash, PartialOrd, Ord, Serialize, Deserialize)]
         pub struct Peripheral {
             pub name: String,
+            #[serde(default)]
             pub address: u32,
             #[serde(skip_serializing_if = "Option::is_none")]
             pub registers: Option<peripheral::Registers>,