Update board layers and examples

example/FVP_Audio/board/Corstone-300/Board-U55.clayer.yml

@@ -1,6 +1,6 @@
 layer:
   type: Board
-  description: Board setup for AI/ML with Ethos U55
+  description: Configuration of SSE-300 FVP for AI/ML with Ethos U55
   for-board: ARM::V2M-MPS3-SSE-300-FVP
   for-device: ARM::SSE-300-MPS3
 
@@ -17,17 +17,18 @@ layer:
         - STDOUT
         - STDERR
         - Heap: 98304
+      consumes:
+        - CMSIS-RTOS2
 
   define:
     - CMSIS_target_header: \"Corstone-300.h\"
-    - ETHOSU_MACS: 128
     - CORSTONE300_FVP
 
   packs:
-    - pack: ARM::CMSIS
-    - pack: ARM::CMSIS-Compiler@^2.2.0
-    - pack: ARM::CMSIS-Ethos-U@^1.0.0-0
     - pack: ARM::AVH_FVP
+    - pack: ARM::CMSIS
+    - pack: ARM::CMSIS-Compiler@^2.3.0
+    - pack: ARM::CMSIS-Ethos-U@^1.0.0
     - pack: ARM::V2M_MPS3_SSE_300_BSP@1.5.0
 
   components:
@@ -54,13 +55,17 @@ layer:
     - component: Device:Native Driver:UART
 
     - component: Machine Learning:NPU Support:Ethos-U Driver&Generic U55
+      define:
+        - ETHOSU_MACS: 128
 
   groups:
     - group: Board
       files:
-        - file: ./main.c
-        - file: ./main.h
-        - file: ./ethos_setup.c
+        - file: main.c
+        - file: main.h
+        - file: ethos_setup.c
+        - file: ethosu_os_rtos2.c
+        - file: ethosu_dcache.c
 
   linker:
-    - regions: ./regions_SSE-300.h
+    - regions: RTE/Device/SSE-300-MPS3/regions_SSE-300.h

example/FVP_Audio/board/Corstone-300/Board-U65.clayer.yml

@@ -1,6 +1,6 @@
 layer:
   type: Board
-  description: Board setup for AI/ML with Ethos U65
+  description: Configuration of SSE-300 FVP for AI/ML with Ethos U65
   for-board: ARM::V2M-MPS3-SSE-300-FVP
   for-device: ARM::SSE-300-MPS3
 
@@ -17,17 +17,18 @@ layer:
         - STDOUT
         - STDERR
         - Heap: 98304
+      consumes:
+        - CMSIS-RTOS2
 
   define:
     - CMSIS_target_header: \"Corstone-300.h\"
-    - ETHOSU_MACS: 256
     - CORSTONE300_FVP
 
   packs:
-    - pack: ARM::CMSIS
-    - pack: ARM::CMSIS-Compiler@^2.2.0
-    - pack: ARM::CMSIS-Ethos-U@^1.0.0-0
     - pack: ARM::AVH_FVP
+    - pack: ARM::CMSIS
+    - pack: ARM::CMSIS-Compiler@^2.3.0
+    - pack: ARM::CMSIS-Ethos-U@^1.0.0
     - pack: ARM::V2M_MPS3_SSE_300_BSP@1.5.0
 
   components:
@@ -54,13 +55,17 @@ layer:
     - component: Device:Native Driver:UART
 
     - component: Machine Learning:NPU Support:Ethos-U Driver&Generic U65
+      define:
+        - ETHOSU_MACS: 256
 
   groups:
     - group: Board
       files:
-        - file: ./main.c
-        - file: ./main.h
-        - file: ./ethos_setup.c
+        - file: main.c
+        - file: main.h
+        - file: ethos_setup.c
+        - file: ethosu_os_rtos2.c
+        - file: ethosu_dcache.c
 
   linker:
-    - regions: ./regions_SSE-300.h
+    - regions: RTE/Device/SSE-300-MPS3/regions_SSE-300.h

example/FVP_Audio/board/Corstone-300/Board.clayer.yml

@@ -1,6 +1,6 @@
 layer:
   type: Board
-  description: Board setup for AI/ML
+  description: Configuration of SSE-300 FVP for AI/ML
   for-board: ARM::V2M-MPS3-SSE-300-FVP
   for-device: ARM::SSE-300-MPS3
 
@@ -23,9 +23,9 @@ layer:
     - CORSTONE300_FVP
 
   packs:
-    - pack: ARM::CMSIS
-    - pack: ARM::CMSIS-Compiler@^2.2.0
     - pack: ARM::AVH_FVP
+    - pack: ARM::CMSIS
+    - pack: ARM::CMSIS-Compiler@^2.3.0
     - pack: ARM::V2M_MPS3_SSE_300_BSP@1.5.0
 
   components:
@@ -54,8 +54,8 @@ layer:
   groups:
     - group: Board
       files:
-        - file: ./main.c
-        - file: ./main.h
+        - file: main.c
+        - file: main.h
 
   linker:
-    - regions: ./regions_SSE-300.h
+    - regions: RTE/Device/SSE-300-MPS3/regions_SSE-300.h

example/FVP_Audio/board/Corstone-300/README.md

@@ -1,20 +1,30 @@
 # Board: Arm V2M-MPS3-SSE-300-FVP
 
-## Board Layer for Corstone-300 FVP
+## Board Layers for Corstone-300 FVP
 
-This layer works for:
+These layers work for:
 
 ```yml
   board: ARM::V2M-MPS3-SSE-300-FVP
   device: ARM::SSE-300-MPS3
 ```
 
+Select one layer matching the application's NPU requirements:
+
+| Layer file           | Use in Application
+|:---------------------|:------------------------
+| Board.clayer.yml     | Without Ethos-U support
+| Board-U55.clayer.yml | With Ethos-U55 support
+| Board-U65.clayer.yml | With Ethos-U65 support
+
+Use the corresponding FVP configuration file listed below.
+
 ### System Configuration
 
 | System Component        | Setting
 |:------------------------|:----------------------------------
-| Heap                    |  96 kB (configured in linker file)
-| Stack (MSP)             |  32 kB (configured in linker file)
+| Heap                    |  96 kB (configured in regions header)
+| Stack (MSP)             |  4 kB (configured in regions header)
 
 ### STDIO mapping
 
@@ -42,8 +52,8 @@ stores and loads signal values.
 |:-----------------------|:----------------------------------------------------
 | Driver_vStreamAudioIn  | 16-bit PCM audio,      16000 samples/second
 | Driver_vStreamAudioOut | 16-bit PCM audio,      16000 samples/second
-| Driver_vStreamVideoIn  | RGB888 video,          resolution 1280 x 720 (W x H)
-| Driver_vStreamVideoOut | RGB888 video,          resolution  480 x 800 (W x H)
+| Driver_vStreamVideoIn  | RGB888 video,          resolution 640 x 480 (W x H)
+| Driver_vStreamVideoOut | RGB888 video,          resolution 640 x 480 (W x H)
 
 ### FVP Configuration File
 

example/FVP_Audio/board/Corstone-300/RTE/Device/SSE-300-MPS3/ac6_linker_script.sct.src

@@ -73,11 +73,8 @@ LR_ROM1 __ROM1_BASE __ROM1_SIZE  {
 
 #if __RAM1_SIZE > 0
   RW_RAM1 __RAM1_BASE __RAM1_SIZE  {
-    ; Ethos-U Cache Area
-    *.o (*ethos_cache_buf)
-
-    ; NN Activation Tensor (activation buffer / tensor arena)
-    *.o (*activation_buf)
+    ; Ethos-U writable area
+    *.o (ethos_arena)
 
    .ANY (+RW +ZI)
   }
@@ -99,8 +96,8 @@ LR_ROM1 __ROM1_BASE __ROM1_SIZE  {
 #if __ROM2_SIZE > 0
 LR_ROM2 __ROM2_BASE __ROM2_SIZE  {
   ER_ROM2 +0 __ROM2_SIZE {
-    ; NN Model Binary Representation
-    *.o (nn_model)
+    ; Ethos-U model, command stream and constants
+    *.o (ethos_model)
 
    .ANY (+RO +XO)
   }

example/FVP_Audio/board/Corstone-300/RTE/Device/SSE-300-MPS3/clang_linker_script.ld.src

@@ -79,6 +79,12 @@ PHDRS
     ram PT_LOAD;
     ram_init PT_LOAD;
     tls PT_TLS;
+#if __RAM1_SIZE > 0
+    ethos_ram PT_LOAD;
+#endif
+#if __ROM2_SIZE > 0
+    ethos_model PT_LOAD;
+#endif
 }
 
 SECTIONS
@@ -317,6 +323,20 @@ SECTIONS
     } >RAM0 :ram
 #endif
 
+    /* Ethos-U writable area */
+#if __RAM1_SIZE > 0
+    .ethos_arena (NOLOAD) : ALIGN(32) {
+        *(ethos_arena)
+    } >RAM1 AT>RAM1 :ethos_ram
+#endif
+
+    /* Ethos-U model, command stream and constants */
+#if __ROM2_SIZE > 0
+    .ethos_model : ALIGN(32) {
+        *(ethos_model)
+    } >ROM2 AT>ROM2 :ethos_model
+#endif
+
     /* Throw away C++ exception handling information */
 
     /*

example/FVP_Audio/board/Corstone-300/RTE/Device/SSE-300-MPS3/gcc_linker_script.ld.src

@@ -318,8 +318,7 @@ SECTIONS
   .cache (NOLOAD):
   {
     . = ALIGN(32);
-    *(*ethos_cache_buf)  /* Ethos-U Cache Area */
-    *(*activation_buf)   /* NN Activation Tensor (activation buffer / tensor arena) */
+    *(ethos_arena)  /* Ethos-U writable area */
   } > RAM1
 
   /* Initialized buffers in fast access RAM */
@@ -331,7 +330,7 @@ SECTIONS
 
   .rom2 :
   {
-    *(*nn_model)         /* NN Model Binary Representation */
+    *(ethos_model)  /* Ethos-U model, command stream and constants */
   } > ROM2
 
   .rom3 :

example/FVP_Audio/board/Corstone-300/RTE/Device/SSE-300-MPS3/iar_linker_script.icf.src

@@ -87,5 +87,26 @@ if (!isempty(RAM0_region))
   define block PROC_STACK with alignment = 8, size = 0 { };
   define block HEAP       with alignment = 8, size = __HEAP_SIZE       { };
   place in RAM0_region { readwrite, block PROC_STACK, block HEAP };
+#if defined (__ARM_FEATURE_CMSE) && (__ARM_FEATURE_CMSE == 3U)
+  /* Reserve the stack seal immediately above the stack. */
+  define block STACKSEAL with alignment = 8, size = 8 { };
+  define block CSTACK_WITH_SEAL with fixed order { block CSTACK, block STACKSEAL };
+  place at end of RAM0_region { block CSTACK_WITH_SEAL };
+#else
   place at end of RAM0_region { block CSTACK };
+#endif
 }
+
+/* Ethos-U writable area */
+#if __RAM1_SIZE > 0
+  do not initialize { section ethos_arena };
+  define block ETHOS_ARENA with alignment = 32
+    { section ethos_arena };
+  place in RAM1_region { block ETHOS_ARENA };
+#endif
+
+/* Ethos-U model, command stream and constants */
+#if __ROM2_SIZE > 0
+  define block ETHOS_MODEL with alignment = 32 { readonly section ethos_model };
+  place in ROM2_region { block ETHOS_MODEL };
+#endif

example/FVP_Audio/board/Corstone-300/ethos_setup.c

@@ -1,5 +1,5 @@
-/*---------------------------------------------------------------------------
- * Copyright (c) 2025 Arm Limited (or its affiliates). All rights reserved.
+/*
+ * Copyright 2025-2026 Arm Limited and/or its affiliates.
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -14,7 +14,7 @@
  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
- *---------------------------------------------------------------------------*/
+ */
 
  #include <stdio.h>
 
@@ -26,18 +26,18 @@
 
 #if defined(ETHOSU65) || defined(ETHOSU85)
 /* Define Ethos-U NPU cache buffer size */
-#ifndef ETHOS_CACHE_BUF_SIZE
-#define ETHOS_CACHE_BUF_SIZE        393216
+#ifndef ETHOS_CACHE_SIZE
+#define ETHOS_CACHE_SIZE            0
 #endif
 
 /* Define Ethos-U cache buffer alignment */
-#ifndef ETHOS_CACHE_BUF_ALIGNMENT
-#define ETHOS_CACHE_BUF_ALIGNMENT   32
+#ifndef ETHOS_CACHE_ALIGNMENT
+#define ETHOS_CACHE_ALIGNMENT       32
 #endif
 
 /* Define Ethos-U NPU cache buffer attributes */
-#ifndef ETHOS_CACHE_BUF_ATTRIBUTES
-#define ETHOS_CACHE_BUF_ATTRIBUTES  __attribute__((section("ethos_cache_buf"), aligned(ETHOS_CACHE_BUF_ALIGNMENT)))
+#ifndef ETHOS_CACHE_ATTRIBUTES
+#define ETHOS_CACHE_ATTRIBUTES  __attribute__((section("ethos_cache"), aligned(ETHOS_CACHE_ALIGNMENT)))
 #endif
 #endif
 
@@ -54,8 +54,9 @@
 /* Ethos NPU driver instance. */
 static struct ethosu_driver EthosDriver;
 
-#if defined(ETHOSU65) || defined(ETHOSU85)
-static uint8_t ethos_cache[ETHOS_CACHE_BUF_SIZE] ETHOS_CACHE_BUF_ATTRIBUTES;
+#if (defined(ETHOSU65) || defined(ETHOSU85)) && (ETHOS_CACHE_SIZE > 0)
+/* Ethos-U NPU cache buffer */
+static uint8_t ethos_cache_buf[ETHOS_CACHE_SIZE] ETHOS_CACHE_ATTRIBUTES;
 #endif
 
 /*
@@ -76,9 +77,9 @@ void ethos_setup (void) {
   /*  Initialize Ethos-U NPU driver. */
   rval = ethosu_init(&EthosDriver,            /* Ethos-U device driver */
                      ethos_base_addr,         /* Ethos-U base address  */
-                     #if defined(ETHOSU65) || defined(ETHOSU85)
-                     ethos_cache,             /* Cache memory pointer  */
-                     sizeof(ethos_cache),     /* Cache memory size     */
+                     #if (defined(ETHOSU65) || defined(ETHOSU85)) && (ETHOS_CACHE_SIZE > 0)
+                     ethos_cache_buf,         /* Cache memory pointer  */
+                     sizeof(ethos_cache_buf), /* Cache memory size     */
                      #else
                      0,                       /* Cache memory pointer  */
                      0,                       /* Cache memory size     */