diff --git a/td-layout/src/build_time.rs b/td-layout/src/build_time.rs
index f05a9f9d..54c5bf76 100644
--- a/td-layout/src/build_time.rs
+++ b/td-layout/src/build_time.rs
@@ -7,6 +7,8 @@
 /*
 Image Layout
 +----------------------------------------+ <- 0x0
+|             LARGE_PAYLOAD              |   (0x0) 0 B
++----------------------------------------+ <- 0x0
 |                 CONFIG                 |   (0x40000) 256 kB
 +----------------------------------------+ <- 0x40000
 |                MAILBOX                 |   (0x1000) 4 kB
@@ -29,6 +31,10 @@ Image size: 0x1000000 (16 MB)
 */
 
 // Image Layout Configuration
+pub const TD_SHIM_FIRMWARE_SIZE: u32 = 0x1000000;
+
+pub const TD_SHIM_LARGE_PAYLOAD_OFFSET: u32 = 0x0;
+pub const TD_SHIM_LARGE_PAYLOAD_SIZE: u32 = 0x0; // 0 B
 
 pub const TD_SHIM_CONFIG_OFFSET: u32 = 0x0;
 pub const TD_SHIM_CONFIG_SIZE: u32 = 0x40000; // 256 kB
@@ -57,16 +63,14 @@ pub const TD_SHIM_IPL_SIZE: u32 = 0x349000; // 3.29 MB
 pub const TD_SHIM_RESET_VECTOR_OFFSET: u32 = 0xFF8000;
 pub const TD_SHIM_RESET_VECTOR_SIZE: u32 = 0x8000; // 32 kB
 
-// Offset when Loading into Memory
-pub const TD_SHIM_FIRMWARE_BASE: u32 = 0xFF000000;
-pub const TD_SHIM_FIRMWARE_SIZE: u32 = 0x1000000;
-
 // TD_SHIM_SEC_INFO_OFFSET equals to firmware size - metadata pointer offset -
 // OVMF GUID table size - SEC Core information size.
 pub const TD_SHIM_SEC_CORE_INFO_OFFSET: u32 = 0xFFFFAC;
 pub const TD_SHIM_SEC_CORE_INFO_BASE: u32 = 0xFFFFFFAC;
 
-// Base Address after Loaded into Memory
+// Rom Configuration
+
+pub const TD_SHIM_FIRMWARE_BASE: u32 = 0xFF000000;
 pub const TD_SHIM_CONFIG_BASE: u32 = 0xFF000000;
 pub const TD_SHIM_MAILBOX_BASE: u32 = 0xFF040000;
 pub const TD_SHIM_TEMP_STACK_BASE: u32 = 0xFF041000;
diff --git a/td-layout/src/memslice.rs b/td-layout/src/memslice.rs
index 120228d6..3251c4ca 100644
--- a/td-layout/src/memslice.rs
+++ b/td-layout/src/memslice.rs
@@ -2,7 +2,10 @@
 //
 // SPDX-License-Identifier: BSD-2-Clause-Patent
 
-use crate::build_time::*;
+use crate::{
+    build_time::*,
+    runtime::exec::{LARGE_PAYLOAD_BASE, LARGE_PAYLOAD_SIZE},
+};
 use core::fmt::Display;
 
 /// Type of build time and runtime memory regions.
@@ -16,6 +19,8 @@ pub enum SliceType {
     ShimPayload,
     /// The `TD_MAILBOX` region in image file
     MailBox,
+    /// The `Large PAYLOAD` region in runtime memory layout
+    LargePayload,
     /// The `PAYLOAD` region in runtime memory layout
     Payload,
     /// The `Kernel Parameter` region in runtime memory layout
@@ -41,6 +46,7 @@ impl SliceType {
             SliceType::TdHob => "TdHob",
             SliceType::ShimPayload => "ShimPayload",
             SliceType::MailBox => "MailBox",
+            SliceType::LargePayload => "LargePayload",
             SliceType::Payload => "Payload",
             SliceType::PayloadParameter => "PayloadParameter",
             SliceType::PayloadHob => "PayloadHob",
@@ -73,6 +79,10 @@ pub fn get_mem_slice<'a>(t: SliceType) -> &'a [u8] {
                 TD_SHIM_PAYLOAD_BASE as *const u8,
                 TD_SHIM_PAYLOAD_SIZE as usize,
             ),
+            SliceType::LargePayload => core::slice::from_raw_parts(
+                LARGE_PAYLOAD_BASE as *const u8,
+                LARGE_PAYLOAD_SIZE as usize,
+            ),
             SliceType::MailBox => core::slice::from_raw_parts(
                 TD_SHIM_MAILBOX_BASE as *const u8,
                 TD_SHIM_MAILBOX_SIZE as usize,
@@ -94,7 +104,7 @@ pub unsafe fn get_mem_slice_mut<'a>(t: SliceType) -> &'a mut [u8] {
             TD_SHIM_MAILBOX_BASE as *const u8 as *mut u8,
             TD_SHIM_MAILBOX_SIZE as usize,
         ),
-        SliceType::Config | SliceType::ShimPayload => {
+        SliceType::Config | SliceType::ShimPayload | SliceType::LargePayload => {
             panic!("get_mem_slice_mut: read only")
         }
         _ => panic!("get_mem_slice_mut: not support"),
diff --git a/td-layout/src/runtime/exec.rs b/td-layout/src/runtime/exec.rs
index 789350bb..6affa7c2 100644
--- a/td-layout/src/runtime/exec.rs
+++ b/td-layout/src/runtime/exec.rs
@@ -20,6 +20,8 @@ Top of Low Memory: 0x80000000
 +----------------------------------------+ <- 0x7DDDE000
 |                  FREE                  |   (0x7D5BE000) 1.96 GB
 +----------------------------------------+ <- 0x820000
+|             LARGE_PAYLOAD              |   (0x0) 0 B
++----------------------------------------+ <- 0x820000
 |                 TD_HOB                 |   (0x20000) 128 kB
 +----------------------------------------+ <- 0x800000
 |               BOOTLOADER               |   (0x800000) 8 MB
@@ -34,6 +36,8 @@ pub const BOOTLOADER_BASE: usize = 0x0;
 pub const BOOTLOADER_SIZE: usize = 0x800000; // 8 MB
 pub const TD_HOB_BASE: usize = 0x800000;
 pub const TD_HOB_SIZE: usize = 0x20000; // 128 kB
+pub const LARGE_PAYLOAD_BASE: usize = 0x820000;
+pub const LARGE_PAYLOAD_SIZE: usize = 0x0; // 0 B
 pub const ACPI_SIZE: usize = 0x100000; // 1 MB
 pub const PAYLOAD_SIZE: usize = 0x2000000; // 32 MB
 pub const PAYLOAD_PAGE_TABLE_SIZE: usize = 0x20000; // 128 kB
@@ -44,6 +48,7 @@ pub const MEMORY_LAYOUT_CONFIG: &[(&'static str, usize, &'static str)] = &[
     // (name of memory region, region size, region type)
     ("Bootloader", 0x800000, "Memory"),
     ("TdHob", 0x20000, "Memory"),
+    ("LargePayload", 0x0, "Memory"),
     ("Acpi", 0x100000, "Acpi"),
     ("Payload", 0x2000000, "Reserved"),
     ("PayloadPageTable", 0x20000, "Reserved"),