diff --git a/.github/workflows/sim.yaml b/.github/workflows/sim.yaml
index 3811c4ed16..77c1339a3a 100644
--- a/.github/workflows/sim.yaml
+++ b/.github/workflows/sim.yaml
@@ -18,17 +18,17 @@ jobs:
         features:
         - "sig-ecdsa,sig-ecdsa-mbedtls,sig-ed25519,enc-kw,bootstrap"
         - "sig-rsa,sig-rsa3072,overwrite-only,validate-primary-slot,swap-move,swap-offset"
-        - "enc-rsa,enc-rsa max-align-32"
-        - "enc-aes256-rsa,enc-aes256-rsa max-align-32"
-        - "enc-ec256,enc-ec256 overwrite-only validate-primary-slot max-align-16,enc-ec256 max-align-32"
-        - "enc-aes256-ec256,enc-aes256-ec256 max-align-32"
-        - "enc-x25519,enc-x25519 max-align-32"
-        - "enc-aes256-x25519,enc-aes256-x25519 max-align-32"
+        - "enc-rsa,enc-rsa max-align-32,enc-rsa max-align-64,enc-rsa max-align-128"
+        - "enc-aes256-rsa,enc-aes256-rsa max-align-32,enc-aes256-rsa max-align-64,enc-aes256-rsa max-align-128"
+        - "enc-ec256,enc-ec256 overwrite-only validate-primary-slot max-align-16,enc-ec256 max-align-32,enc-ec256 max-align-64,enc-ec256 max-align-128"
+        - "enc-aes256-ec256,enc-aes256-ec256 max-align-32,enc-aes256-ec256 max-align-64,enc-aes256-ec256 max-align-128"
+        - "enc-x25519,enc-x25519 max-align-32,enc-x25519 max-align-64,enc-x25519 max-align-128"
+        - "enc-aes256-x25519,enc-aes256-x25519 max-align-32,enc-aes256-x25519 max-align-64,enc-aes256-x25519 max-align-128"
         - "sig-rsa overwrite-only,sig-ecdsa overwrite-only,sig-ecdsa-mbedtls overwrite-only,multiimage overwrite-only"
         - "sig-rsa validate-primary-slot,sig-ecdsa validate-primary-slot,sig-ecdsa-mbedtls validate-primary-slot,sig-rsa multiimage validate-primary-slot"
-        - "enc-kw overwrite-only,enc-kw overwrite-only max-align-32"
-        - "enc-rsa overwrite-only,enc-rsa overwrite-only max-align-32"
-        - "enc-aes256-kw overwrite-only,enc-aes256-kw overwrite-only max-align-32"
+        - "enc-kw overwrite-only,enc-kw overwrite-only max-align-32,enc-kw overwrite-only max-align-64,enc-kw overwrite-only max-align-128"
+        - "enc-rsa overwrite-only,enc-rsa overwrite-only max-align-32,enc-rsa overwrite-only max-align-64,enc-rsa overwrite-only max-align-128"
+        - "enc-aes256-kw overwrite-only,enc-aes256-kw overwrite-only max-align-32,enc-aes256-kw overwrite-only max-align-64,enc-aes256-kw overwrite-only max-align-128"
         - "sig-rsa enc-rsa validate-primary-slot,swap-move enc-rsa sig-rsa validate-primary-slot bootstrap,swap-offset enc-rsa sig-rsa validate-primary-slot bootstrap"
         - "sig-rsa enc-kw validate-primary-slot bootstrap,sig-ed25519 enc-x25519 validate-primary-slot"
         - "sig-ecdsa enc-kw validate-primary-slot"
@@ -84,7 +84,7 @@ jobs:
         - "ram-load enc-aes256-kw multiimage"
         - "ram-load enc-aes256-kw sig-ecdsa-mbedtls multiimage"
         - "custom-crypto,custom-crypto overwrite-only,custom-crypto validate-primary-slot,custom-crypto swap-offset"
-        - "custom-enc-crypto,custom-enc-crypto validate-primary-slot,custom-enc-crypto swap-offset validate-primary-slot max-align-32"
+        - "custom-enc-crypto,custom-enc-crypto validate-primary-slot,custom-enc-crypto swap-offset validate-primary-slot max-align-32,custom-enc-crypto swap-offset validate-primary-slot max-align-64,custom-enc-crypto swap-offset validate-primary-slot max-align-128"
     runs-on: ubuntu-latest
     env:
       MULTI_FEATURES: ${{ matrix.features }}
diff --git a/boot/bootutil/include/bootutil/bootutil_public.h b/boot/bootutil/include/bootutil/bootutil_public.h
index a0ee5872aa..026153f4e3 100644
--- a/boot/bootutil/include/bootutil/bootutil_public.h
+++ b/boot/bootutil/include/bootutil/bootutil_public.h
@@ -79,7 +79,7 @@ extern "C" {
 #ifdef MCUBOOT_BOOT_MAX_ALIGN
 
 #if defined(MCUBOOT_SWAP_USING_MOVE) || defined(MCUBOOT_SWAP_USING_SCRATCH) || defined(MCUBOOT_SWAP_USING_OFFSET)
-_Static_assert(MCUBOOT_BOOT_MAX_ALIGN >= 8 && MCUBOOT_BOOT_MAX_ALIGN <= 32,
+_Static_assert(MCUBOOT_BOOT_MAX_ALIGN >= 8 && MCUBOOT_BOOT_MAX_ALIGN <= 128,
                "Unsupported value for MCUBOOT_BOOT_MAX_ALIGN for SWAP upgrade modes");
 #endif
 
diff --git a/docs/imgtool.md b/docs/imgtool.md
index dfc59e2e16..c7ae7ec880 100644
--- a/docs/imgtool.md
+++ b/docs/imgtool.md
@@ -117,10 +117,10 @@ primary slot and adds a header and trailer that the bootloader is expecting:
       --public-key-format [hash|full]
                                       In what format to add the public key to the
                                       image manifest: full key or hash of the key.
-      --max-align [8|16|32]           Maximum flash alignment. Set if flash
+      --max-align [8|16|32|64|128]    Maximum flash alignment. Set if flash
                                       alignment of the primary and secondary slot
                                       differ and any of them is larger than 8.
-      --align [1|2|4|8|16|32]         Alignment used by swap update modes.
+      --align [1|2|4|8|16|32|64|128]  Alignment used by swap update modes.
       -v, --version TEXT              [required]
       -s, --security-counter TEXT     Specify the value of security counter. Use
                                       the `auto` keyword to automatically generate
diff --git a/scripts/imgtool/image.py b/scripts/imgtool/image.py
index 06d9caf082..ebaa18755c 100755
--- a/scripts/imgtool/image.py
+++ b/scripts/imgtool/image.py
@@ -861,7 +861,7 @@ def _trailer_size(self, write_size, max_sectors, overwrite_only, enckey,
         if overwrite_only:
             return self.max_align * 2 + magic_align_size
         else:
-            if write_size not in set([1, 2, 4, 8, 16, 32]):
+            if write_size not in set([1, 2, 4, 8, 16, 32, 64, 128]):
                 raise click.BadParameter(f"Invalid alignment: {write_size}")
             m = DEFAULT_MAX_SECTORS if max_sectors is None else max_sectors
             trailer = m * 3 * write_size  # status area
diff --git a/scripts/imgtool/main.py b/scripts/imgtool/main.py
index a9d9acbc43..1bc9c3da0c 100755
--- a/scripts/imgtool/main.py
+++ b/scripts/imgtool/main.py
@@ -473,11 +473,12 @@ def convert(self, value, param, ctx):
               help='Specify the value of security counter. Use the `auto` '
               'keyword to automatically generate it from the image version.')
 @click.option('-v', '--version', callback=validate_version,  required=True)
-@click.option('--align', type=click.Choice(['1', '2', '4', '8', '16', '32']),
+@click.option('--align', type=click.Choice(['1', '2', '4', '8', '16', '32',
+              '64', '128']),
               default='1',
               required=False,
               help='Alignment used by swap update modes.')
-@click.option('--max-align', type=click.Choice(['8', '16', '32']),
+@click.option('--max-align', type=click.Choice(['8', '16', '32','64', '128']),
               required=False,
               help='Maximum flash alignment. Set if flash alignment of the '
               'primary and secondary slot differ and any of them is larger '
diff --git a/sim/Cargo.toml b/sim/Cargo.toml
index cb206e0437..c76e6345ef 100644
--- a/sim/Cargo.toml
+++ b/sim/Cargo.toml
@@ -36,6 +36,8 @@ direct-xip = ["mcuboot-sys/direct-xip"]
 downgrade-prevention = ["mcuboot-sys/downgrade-prevention"]
 max-align-16 = ["mcuboot-sys/max-align-16"]
 max-align-32 = ["mcuboot-sys/max-align-32"]
+max-align-64 = ["mcuboot-sys/max-align-64"]
+max-align-128 = ["mcuboot-sys/max-align-128"]
 hw-rollback-protection = ["mcuboot-sys/hw-rollback-protection"]
 check-load-addr = ["mcuboot-sys/check-load-addr"]
 custom-crypto = ["mcuboot-sys/custom-crypto"]
diff --git a/sim/mcuboot-sys/Cargo.toml b/sim/mcuboot-sys/Cargo.toml
index 26e98cddaf..f7511d8fcb 100644
--- a/sim/mcuboot-sys/Cargo.toml
+++ b/sim/mcuboot-sys/Cargo.toml
@@ -102,6 +102,12 @@ max-align-16 = []
 # Support images with 32-byte maximum write alignment value.
 max-align-32 = []
 
+# Support images with 64-byte maximum write alignment value.
+max-align-64 = []
+
+# Support images with 128-byte maximum write alignment value.
+max-align-128 = []
+
 # Use logical sectors.  Enable exactly one of the sized features; each
 # implies the `logical-sectors` umbrella that code can test against
 # without caring about the size.
diff --git a/sim/mcuboot-sys/build.rs b/sim/mcuboot-sys/build.rs
index cb7d449ca3..bf9eacd687 100644
--- a/sim/mcuboot-sys/build.rs
+++ b/sim/mcuboot-sys/build.rs
@@ -41,6 +41,8 @@ fn main() {
     let direct_xip = env::var("CARGO_FEATURE_DIRECT_XIP").is_ok();
     let max_align_16 = env::var("CARGO_FEATURE_MAX_ALIGN_16").is_ok();
     let max_align_32 = env::var("CARGO_FEATURE_MAX_ALIGN_32").is_ok();
+    let max_align_64 = env::var("CARGO_FEATURE_MAX_ALIGN_64").is_ok();
+    let max_align_128 = env::var("CARGO_FEATURE_MAX_ALIGN_128").is_ok();
     let hw_rollback_protection = env::var("CARGO_FEATURE_HW_ROLLBACK_PROTECTION").is_ok();
     let check_load_addr = env::var("CARGO_FEATURE_CHECK_LOAD_ADDR").is_ok();
     let custom_crypto = env::var("CARGO_FEATURE_CUSTOM_CRYPTO").is_ok();
@@ -56,7 +58,11 @@ fn main() {
     conf.conf.define("MCUBOOT_HAVE_ASSERT_H", None);
     conf.conf.define("MCUBOOT_MAX_IMG_SECTORS", Some("128"));
 
-    if max_align_32 {
+    if max_align_128 {
+        conf.conf.define("MCUBOOT_BOOT_MAX_ALIGN", Some("128"));
+    } else if max_align_64 {
+        conf.conf.define("MCUBOOT_BOOT_MAX_ALIGN", Some("64"));
+    } else if max_align_32 {
         conf.conf.define("MCUBOOT_BOOT_MAX_ALIGN", Some("32"));
     } else if max_align_16 {
         conf.conf.define("MCUBOOT_BOOT_MAX_ALIGN", Some("16"));
diff --git a/sim/src/image.rs b/sim/src/image.rs
index 19754b7840..7f8082779f 100644
--- a/sim/src/image.rs
+++ b/sim/src/image.rs
@@ -798,6 +798,26 @@ impl ImagesBuilder {
                 flash.insert(dev_id, dev);
                 (flash, Rc::new(areadesc), &[Caps::SwapUsingScratch, Caps::OverwriteUpgrade, Caps::SwapUsingMove, Caps::RamLoad, Caps::DirectXip])
             }
+            DeviceName::RA6M3 => {
+                // Renesas Flash: 8 sectors of 8K, 30 sectors of 32K (1MB variant). 
+                let dev = SimFlash::new(vec![
+                                        //First 8 sectors of 8K (64K), these are usually used to store mcuboot
+                                        8 * 1024, 8 * 1024, 8 * 1024, 8 * 1024, 8 * 1024, 8 * 1024, 8 * 1024, 8 * 1024,
+                                        //Next 30 sectors of 32K (960K), these are usually used to store the images
+                                        32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024,
+                                        32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024,
+                                        32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024, 32*1024 ],
+                                        align as usize, erased_val);
+                let dev_id = 0;
+                let mut areadesc = AreaDesc::new();
+                areadesc.add_flash_sectors(dev_id, &dev);
+                areadesc.add_image(0x020000, 0x020000, FlashId::Image0, dev_id);
+                areadesc.add_image(0x040000, 0x020000, FlashId::Image1, dev_id);
+                areadesc.add_image(0x060000, 0x020000, FlashId::ImageScratch, dev_id);
+                let mut flash = SimMultiFlash::new();
+                flash.insert(dev_id, dev);
+                (flash, Rc::new(areadesc), &[Caps::SwapUsingMove, Caps::SwapUsingOffset])
+            }
         }
     }
 
@@ -2713,7 +2733,7 @@ pub struct SlotInfo {
     pub dev_id: u8,
 }
 
-#[cfg(all(not(feature = "max-align-16"), not(feature = "max-align-32")))]
+#[cfg(all(not(feature = "max-align-16"), not(feature = "max-align-32"), not(feature = "max-align-64"), not(feature = "max-align-128")))]
 const MAGIC: &[u8] = &[0x77, 0xc2, 0x95, 0xf3,
                        0x60, 0xd2, 0xef, 0x7f,
                        0x35, 0x52, 0x50, 0x0f,
@@ -2731,6 +2751,18 @@ const MAGIC: &[u8] = &[0x20, 0x00, 0x2d, 0xe1,
                        0x8d, 0x77, 0x67, 0x9c,
                        0x11, 0x0f, 0x1f, 0x8a];
 
+#[cfg(feature = "max-align-64")]
+const MAGIC: &[u8] = &[0x40, 0x00, 0x2d, 0xe1,
+                       0x5d, 0x29, 0x41, 0x0b,
+                       0x8d, 0x77, 0x67, 0x9c,
+                       0x11, 0x0f, 0x1f, 0x8a];
+
+#[cfg(feature = "max-align-128")]
+const MAGIC: &[u8] = &[0x80, 0x00, 0x2d, 0xe1,
+                       0x5d, 0x29, 0x41, 0x0b,
+                       0x8d, 0x77, 0x67, 0x9c,
+                       0x11, 0x0f, 0x1f, 0x8a];
+
 // Replicates defines found in bootutil.h
 const BOOT_MAGIC_GOOD: Option<u8> = Some(1);
 const BOOT_MAGIC_UNSET: Option<u8> = Some(3);
@@ -2808,7 +2840,7 @@ pub fn show_sizes() {
     }
 }
 
-#[cfg(all(not(feature = "max-align-16"), not(feature = "max-align-32")))]
+#[cfg(all(not(feature = "max-align-16"), not(feature = "max-align-32"),not(feature = "max-align-64"), not(feature = "max-align-128")))]
 fn test_alignments() -> &'static [usize] {
     &[1, 2, 4, 8]
 }
@@ -2823,6 +2855,15 @@ fn test_alignments() -> &'static [usize] {
     &[32]
 }
 
+#[cfg(feature = "max-align-64")]
+fn test_alignments() -> &'static [usize] {
+    &[64]
+}
+
+#[cfg(feature = "max-align-128")]
+fn test_alignments() -> &'static [usize] {
+    &[128]
+}
 /// For testing, some of the tests are quite slow. This will query for an
 /// environment variable `MCUBOOT_SKIP_SLOW_TESTS`, which can be set to avoid
 /// running these tests.
diff --git a/sim/src/lib.rs b/sim/src/lib.rs
index 9eb4b877fb..a49a135907 100644
--- a/sim/src/lib.rs
+++ b/sim/src/lib.rs
@@ -64,7 +64,7 @@ struct Args {
 #[derive(Copy, Clone, Debug, Deserialize)]
 pub enum DeviceName {
     Stm32f4, Stm32f4SpiFlash, Stm32f769, K64f, K64fBig, K64fMulti, Nrf52840, Nrf52840SpiFlash,
-    Nrf52840UnequalSlots, Nrf52840UnequalSlotsLargerSlot1,PSOCEdgeE8x, SmallPages,
+    Nrf52840UnequalSlots, Nrf52840UnequalSlotsLargerSlot1, PSOCEdgeE8x, SmallPages, RA6M3,
 }
 
 pub static ALL_DEVICES: &[DeviceName] = &[
@@ -80,6 +80,7 @@ pub static ALL_DEVICES: &[DeviceName] = &[
     DeviceName::Nrf52840UnequalSlotsLargerSlot1,
     DeviceName::PSOCEdgeE8x,
     DeviceName::SmallPages,
+    DeviceName::RA6M3 
 ];
 
 impl fmt::Display for DeviceName {
@@ -97,6 +98,7 @@ impl fmt::Display for DeviceName {
             DeviceName::Nrf52840UnequalSlotsLargerSlot1 => "Nrf52840UnequalSlotsLargerSlot1",
             DeviceName::PSOCEdgeE8x => "PSOCEdgeE8x",
             DeviceName::SmallPages => "smallpages",
+            DeviceName::RA6M3 => "RA6M3",
         };
         f.write_str(name)
     }