[nrf fromlist] platform: nordic_nrf: nrf7120: Fix RAM and NS storage partition layout

Define S_RAM_PARTITION_SIZE (64 kB) so non-secure gets the rest of the
768 kB M33 SRAM map for Wi-Fi. Place non-secure storage at the end of
the TF-M image layout instead of FLASH_TOTAL_SIZE.

Upstream PR #: 51185

Change-Id: I7c176dbddb38cfc0e6bb333b3f87c895968d53e5
Signed-off-by: Chaitanya Tata <Chaitanya.Tata@nordicsemi.no>

Author: krish2718

platform/ext/target/nordic_nrf/common/nrf7120/partition/flash_layout.h

@@ -30,6 +30,14 @@
  * 0x0008_A000 Non-secure image primary (844 KB)
  * 0x0015_D000 Non-secure storage, used when built with NRF_NS_STORAGE=ON,
  *             otherwise unused (32 KB)
+ *
+ * RAM layout on nRF7120 Application MCU (768 kB M33 SRAM):
+ *
+ * 0x2000_0000 Secure RAM (64 kB)
+ * 0x2001_0000 Non-secure RAM (704 kB, remainder of TOTAL_RAM_SIZE)
+ *
+ * Secure RAM is kept to 64 kB so the non-secure application (Wi-Fi stack)
+ * gets as much of the M33 SRAM map as TF-M can grant.
  */
 
 /* This header file is included from linker scatter file as well, where only a
@@ -53,6 +61,7 @@
  * with TF-M later FLPR volatile memory is not used by TF-M. */
 #define SRAM_BASE_ADDRESS                   (0x20000000)
 #define TOTAL_RAM_SIZE                      (0x000C0000)       /* 768 kB, since other 256 kB are reserved for FLPR */
+#define S_RAM_PARTITION_SIZE                (0x10000)          /* 64 kB secure RAM */
 
 #define FLASH_S_PARTITION_SIZE                (0x80000)       /* S partition: 512 kB*/
 #define FLASH_NS_PARTITION_SIZE               (0xD3000)       /* NS partition: 844 kB*/
@@ -101,8 +110,8 @@
 
 /* Non-secure storage region */
 #define NRF_FLASH_NS_STORAGE_AREA_SIZE      (0x8000)   /* 32 KB */
-#define NRF_FLASH_NS_STORAGE_AREA_OFFSET    (FLASH_TOTAL_SIZE - \
-                                             NRF_FLASH_NS_STORAGE_AREA_SIZE)
+#define NRF_FLASH_NS_STORAGE_AREA_OFFSET    (SECURE_STORAGE_PARTITIONS_END + \
+                                             FLASH_NS_PARTITION_SIZE)
 
 /* Flash device name used by BL2
  * Name is defined in flash driver file: Driver_Flash.c

platform/ext/target/nordic_nrf/common/nrf7120/partition/region_defs.h

@@ -50,7 +50,7 @@
 #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_SIZE     (S_RAM_PARTITION_SIZE)
 #define S_DATA_LIMIT    (S_DATA_START + S_DATA_SIZE - 1)
 
 /* Copied from the CONFIG_TFM_S_CODE_VECTOR_TABLE_SIZE in sdk-nrf */