diff --git a/microdroid/dice/android.hardware.security.dice-service.microdroid.rc b/microdroid/dice/android.hardware.security.dice-service.microdroid.rc
index 162081e..7d9d441 100644
--- a/microdroid/dice/android.hardware.security.dice-service.microdroid.rc
+++ b/microdroid/dice/android.hardware.security.dice-service.microdroid.rc
@@ -1,3 +1,3 @@
 service vendor.dice-microdroid /vendor/bin/hw/android.hardware.security.dice-service.microdroid
-    class early_hal
-    user nobody
+    user diced
+    group diced
diff --git a/microdroid/dice/service.rs b/microdroid/dice/service.rs
index 3401654..8cb5cc3 100644
--- a/microdroid/dice/service.rs
+++ b/microdroid/dice/service.rs
@@ -14,17 +14,103 @@
 
 //! Main entry point for the microdroid IDiceDevice HAL implementation.
 
-use anyhow::Result;
+use anyhow::{bail, Error, Result};
+use byteorder::{NativeEndian, ReadBytesExt};
 use diced::{
     dice,
     hal_node::{DiceArtifacts, DiceDevice, ResidentHal, UpdatableDiceArtifacts},
 };
+use libc::{c_void, mmap, munmap, MAP_FAILED, MAP_PRIVATE, PROT_READ};
 use serde::{Deserialize, Serialize};
+use std::fs;
+use std::os::unix::io::AsRawFd;
 use std::panic;
+use std::path::{Path, PathBuf};
+use std::ptr::null_mut;
+use std::slice;
 use std::sync::Arc;
 
 const DICE_HAL_SERVICE_NAME: &str = "android.hardware.security.dice.IDiceDevice/default";
 
+/// Artifacts that are mapped into the process address space from the driver.
+struct MappedDriverArtifacts<'a> {
+    mmap_addr: *mut c_void,
+    mmap_size: usize,
+    cdi_attest: &'a [u8; dice::CDI_SIZE],
+    cdi_seal: &'a [u8; dice::CDI_SIZE],
+    bcc: &'a [u8],
+}
+
+impl MappedDriverArtifacts<'_> {
+    fn new(driver_path: &Path) -> Result<Self> {
+        let mut file = fs::File::open(driver_path)
+            .map_err(|error| Error::new(error).context("Opening driver"))?;
+        let mmap_size =
+            file.read_u64::<NativeEndian>()
+                .map_err(|error| Error::new(error).context("Reading driver"))? as usize;
+        // It's safe to map the driver as the service will only create a single
+        // mapping per process.
+        let mmap_addr = unsafe {
+            let fd = file.as_raw_fd();
+            mmap(null_mut(), mmap_size, PROT_READ, MAP_PRIVATE, fd, 0)
+        };
+        if mmap_addr == MAP_FAILED {
+            bail!("Failed to mmap {:?}", driver_path);
+        }
+        // The slice is created for the region of memory that was just
+        // successfully mapped into the process address space so it will be
+        // accessible and not referenced from anywhere else.
+        let mmap_buf =
+            unsafe { slice::from_raw_parts((mmap_addr as *const u8).as_ref().unwrap(), mmap_size) };
+        // Very inflexible parsing / validation of the BccHandover data. Assumes deterministically
+        // encoded CBOR.
+        //
+        // BccHandover = {
+        //   1 : bstr .size 32,     ; CDI_Attest
+        //   2 : bstr .size 32,     ; CDI_Seal
+        //   3 : Bcc,               ; Certificate chain
+        // }
+        if mmap_buf[0..4] != [0xa3, 0x01, 0x58, 0x20]
+            || mmap_buf[36..39] != [0x02, 0x58, 0x20]
+            || mmap_buf[71] != 0x03
+        {
+            bail!("BccHandover format mismatch");
+        }
+        Ok(Self {
+            mmap_addr,
+            mmap_size,
+            cdi_attest: mmap_buf[4..36].try_into().unwrap(),
+            cdi_seal: mmap_buf[39..71].try_into().unwrap(),
+            bcc: &mmap_buf[72..],
+        })
+    }
+}
+
+impl Drop for MappedDriverArtifacts<'_> {
+    fn drop(&mut self) {
+        // All references to the mapped region have the same lifetime as self.
+        // Since self is being dropped, so are all the references to the mapped
+        // region meaning its safe to unmap.
+        let ret = unsafe { munmap(self.mmap_addr, self.mmap_size) };
+        if ret != 0 {
+            log::warn!("Failed to munmap ({})", ret);
+        }
+    }
+}
+
+impl DiceArtifacts for MappedDriverArtifacts<'_> {
+    fn cdi_attest(&self) -> &[u8; dice::CDI_SIZE] {
+        self.cdi_attest
+    }
+    fn cdi_seal(&self) -> &[u8; dice::CDI_SIZE] {
+        self.cdi_seal
+    }
+    fn bcc(&self) -> Vec<u8> {
+        // The BCC only contains public information so it's fine to copy.
+        self.bcc.to_vec()
+    }
+}
+
 /// Artifacts that are kept in the process address space after the artifacts
 /// from the driver have been consumed.
 #[derive(Clone, Serialize, Deserialize)]
@@ -49,19 +135,26 @@
 
 #[derive(Clone, Serialize, Deserialize)]
 enum DriverArtifactManager {
+    Driver(PathBuf),
     Updated(RawArtifacts),
 }
 
 impl DriverArtifactManager {
-    fn new() -> Self {
-        // TODO(214231981): replace with true values passed by bootloader
-        let (cdi_attest, cdi_seal, bcc) = diced_sample_inputs::make_sample_bcc_and_cdis()
-            .expect("Failed to create sample dice artifacts.");
-        Self::Updated(RawArtifacts {
-            cdi_attest: cdi_attest[..].try_into().unwrap(),
-            cdi_seal: cdi_seal[..].try_into().unwrap(),
-            bcc,
-        })
+    fn new(driver_path: &Path) -> Self {
+        // TODO(218793274): fail if driver is missing in protected mode
+        if driver_path.exists() {
+            log::info!("Using DICE values from driver");
+            Self::Driver(driver_path.to_path_buf())
+        } else {
+            log::warn!("Using sample DICE values");
+            let (cdi_attest, cdi_seal, bcc) = diced_sample_inputs::make_sample_bcc_and_cdis()
+                .expect("Failed to create sample dice artifacts.");
+            Self::Updated(RawArtifacts {
+                cdi_attest: cdi_attest[..].try_into().unwrap(),
+                cdi_seal: cdi_seal[..].try_into().unwrap(),
+                bcc,
+            })
+        }
     }
 }
 
@@ -71,10 +164,17 @@
         F: FnOnce(&dyn DiceArtifacts) -> Result<T>,
     {
         match self {
+            Self::Driver(driver_path) => f(&MappedDriverArtifacts::new(driver_path.as_path())?),
             Self::Updated(raw_artifacts) => f(raw_artifacts),
         }
     }
     fn update(self, new_artifacts: &impl DiceArtifacts) -> Result<Self> {
+        if let Self::Driver(driver_path) = self {
+            // Writing to the device wipes the artifcates. The string is ignored
+            // by the driver but included for documentation.
+            fs::write(driver_path, "wipe")
+                .map_err(|error| Error::new(error).context("Wiping driver"))?;
+        }
         Ok(Self::Updated(RawArtifacts {
             cdi_attest: *new_artifacts.cdi_attest(),
             cdi_seal: *new_artifacts.cdi_seal(),
@@ -102,7 +202,7 @@
             // Safety: ResidentHal cannot be used in multi threaded processes.
             // This service does not start a thread pool. The main thread is the only thread
             // joining the thread pool, thereby keeping the process single threaded.
-            ResidentHal::new(DriverArtifactManager::new())
+            ResidentHal::new(DriverArtifactManager::new(Path::new("/dev/open-dice0")))
         }
         .expect("Failed to create ResidentHal implementation."),
     );
diff --git a/microdroid/ueventd.rc b/microdroid/ueventd.rc
index 037b8fc..340a1f7 100644
--- a/microdroid/ueventd.rc
+++ b/microdroid/ueventd.rc
@@ -27,3 +27,5 @@
 
 # Virtual console for logcat
 /dev/hvc2                 0660   logd       logd
+
+/dev/open-dice0           0660   diced      diced