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diff --git a/platform/ext/target/arm/musca_s1/partition/region_defs.h b/platform/ext/target/arm/musca_s1/partition/region_defs.h
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+/*
+ * Copyright (c) 2017-2020 Arm Limited. All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __REGION_DEFS_H__
+#define __REGION_DEFS_H__
+
+#include "flash_layout.h"
+
+#define BL2_HEAP_SIZE (0x0001000)
+#define BL2_MSP_STACK_SIZE (0x0001800)
+
+#define S_HEAP_SIZE (0x0001000)
+#define S_MSP_STACK_SIZE_INIT (0x0000400)
+#define S_MSP_STACK_SIZE (0x0000800)
+#define S_PSP_STACK_SIZE (0x0000800)
+
+#define NS_HEAP_SIZE (0x0001000)
+#define NS_MSP_STACK_SIZE (0x00000A0)
+#define NS_PSP_STACK_SIZE (0x0000140)
+
+/* This size of buffer is big enough to store an attestation
+ * token produced by initial attestation service
+ */
+#define PSA_INITIAL_ATTEST_TOKEN_MAX_SIZE (0x250)
+
+/*
+ * MRAM MPC granularity is 4 KB on Musca. Alignment
+ * of partitions is defined in accordance with this constraint.
+ */
+#ifdef BL2
+#ifndef LINK_TO_SECONDARY_PARTITION
+#define S_IMAGE_PRIMARY_PARTITION_OFFSET (FLASH_AREA_0_OFFSET)
+#define S_IMAGE_SECONDARY_PARTITION_OFFSET (FLASH_AREA_2_OFFSET)
+#else
+#define S_IMAGE_PRIMARY_PARTITION_OFFSET (FLASH_AREA_2_OFFSET)
+#define S_IMAGE_SECONDARY_PARTITION_OFFSET (FLASH_AREA_0_OFFSET)
+#endif /* !LINK_TO_SECONDARY_PARTITION */
+#else
+#define S_IMAGE_PRIMARY_PARTITION_OFFSET (0x0)
+#endif /* BL2 */
+
+#ifndef LINK_TO_SECONDARY_PARTITION
+#define NS_IMAGE_PRIMARY_PARTITION_OFFSET (FLASH_AREA_0_OFFSET \
+ + FLASH_S_PARTITION_SIZE)
+#else
+#define NS_IMAGE_PRIMARY_PARTITION_OFFSET (FLASH_AREA_2_OFFSET \
+ + FLASH_S_PARTITION_SIZE)
+#endif /* !LINK_TO_SECONDARY_PARTITION */
+
+/* Boot partition structure if MCUBoot is used:
+ * 0x0_0000 Bootloader header
+ * 0x0_0400 Image area
+ * 0x1_FC00 Trailer
+ */
+/* IMAGE_CODE_SIZE is the space available for the software binary image.
+ * It is less than the FLASH_S_PARTITION_SIZE + FLASH_NS_PARTITION_SIZE
+ * because we reserve space for the image header and trailer introduced
+ * by the bootloader.
+ */
+#ifdef BL2
+#define BL2_HEADER_SIZE (0x400) /* 1 KB */
+#define BL2_TRAILER_SIZE (0x800) /* 2 KB */
+#else
+/* No header if no bootloader, but keep IMAGE_CODE_SIZE the same */
+#define BL2_HEADER_SIZE (0x0)
+#define BL2_TRAILER_SIZE (0xC00)
+#endif /* BL2 */
+
+#define IMAGE_S_CODE_SIZE \
+ (FLASH_S_PARTITION_SIZE - BL2_HEADER_SIZE - BL2_TRAILER_SIZE)
+#define IMAGE_NS_CODE_SIZE \
+ (FLASH_NS_PARTITION_SIZE - BL2_HEADER_SIZE - BL2_TRAILER_SIZE)
+
+#define CMSE_VENEER_REGION_SIZE (0x340)
+
+/* Alias definitions for secure and non-secure areas*/
+#define S_ROM_ALIAS(x) (S_ROM_ALIAS_BASE + (x))
+#define NS_ROM_ALIAS(x) (NS_ROM_ALIAS_BASE + (x))
+
+#define S_RAM_ALIAS(x) (S_RAM_ALIAS_BASE + (x))
+#define NS_RAM_ALIAS(x) (NS_RAM_ALIAS_BASE + (x))
+
+/* Secure regions */
+#define S_IMAGE_PRIMARY_AREA_OFFSET \
+ (S_IMAGE_PRIMARY_PARTITION_OFFSET + BL2_HEADER_SIZE)
+#define S_CODE_START (S_ROM_ALIAS(S_IMAGE_PRIMARY_AREA_OFFSET))
+#define S_CODE_SIZE (IMAGE_S_CODE_SIZE - CMSE_VENEER_REGION_SIZE)
+#define S_CODE_LIMIT (S_CODE_START + S_CODE_SIZE - 1)
+
+#define S_DATA_START (S_RAM_ALIAS(0x0))
+#define S_DATA_SIZE (TOTAL_RAM_SIZE / 2)
+#define S_DATA_LIMIT (S_DATA_START + S_DATA_SIZE - 1)
+
+/* CMSE Veneers region */
+#define CMSE_VENEER_REGION_START (S_CODE_LIMIT + 1)
+
+/* Non-secure regions */
+#define NS_IMAGE_PRIMARY_AREA_OFFSET \
+ (NS_IMAGE_PRIMARY_PARTITION_OFFSET + BL2_HEADER_SIZE)
+#define NS_CODE_START (NS_ROM_ALIAS(NS_IMAGE_PRIMARY_AREA_OFFSET))
+#define NS_CODE_SIZE (IMAGE_NS_CODE_SIZE)
+#define NS_CODE_LIMIT (NS_CODE_START + NS_CODE_SIZE - 1)
+
+#define NS_DATA_START (NS_RAM_ALIAS(TOTAL_RAM_SIZE / 2))
+#define NS_DATA_SIZE (TOTAL_RAM_SIZE / 2)
+#define NS_DATA_LIMIT (NS_DATA_START + NS_DATA_SIZE - 1)
+
+/* NS partition information is used for MPC and SAU configuration */
+#define NS_PARTITION_START \
+ (NS_ROM_ALIAS(NS_IMAGE_PRIMARY_PARTITION_OFFSET))
+
+#define NS_PARTITION_SIZE (FLASH_NS_PARTITION_SIZE)
+
+/* Secondary partition for new images in case of firmware upgrade */
+#define SECONDARY_PARTITION_START \
+ (NS_ROM_ALIAS(S_IMAGE_SECONDARY_PARTITION_OFFSET))
+#define SECONDARY_PARTITION_SIZE (FLASH_S_PARTITION_SIZE + \
+ FLASH_NS_PARTITION_SIZE)
+
+/* Code SRAM area */
+#define TOTAL_CODE_SRAM_SIZE (0x00080000) /* 512 KB */
+#define S_CODE_SRAM_ALIAS_BASE (0x1A400000)
+#define NS_CODE_SRAM_ALIAS_BASE (0x0A400000)
+
+#ifdef BL2
+/* Bootloader regions */
+#define BL2_CODE_START (S_ROM_ALIAS(FLASH_AREA_BL2_OFFSET))
+#define BL2_CODE_SIZE (FLASH_AREA_BL2_SIZE)
+#define BL2_CODE_LIMIT (BL2_CODE_START + BL2_CODE_SIZE - 1)
+
+#define BL2_DATA_START (S_RAM_ALIAS(0x0))
+#define BL2_DATA_SIZE (TOTAL_RAM_SIZE)
+#define BL2_DATA_LIMIT (BL2_DATA_START + BL2_DATA_SIZE - 1)
+#endif /* BL2 */
+
+/* Shared data area between bootloader and runtime firmware.
+ * Shared data area is allocated at the beginning of the RAM, it is overlapping
+ * with TF-M Secure code's MSP stack
+ */
+#define BOOT_TFM_SHARED_DATA_BASE S_RAM_ALIAS_BASE
+#define BOOT_TFM_SHARED_DATA_SIZE (0x400)
+#define BOOT_TFM_SHARED_DATA_LIMIT (BOOT_TFM_SHARED_DATA_BASE + \
+ BOOT_TFM_SHARED_DATA_SIZE - 1)
+
+#endif /* __REGION_DEFS_H__ */