soc: nordic: uicr: Add support for uicr.PROTECTEDMEM

Add support for PROTECTEDMEM.

Signed-off-by: Sebastian Bøe <[email protected]>

Author: SebastianBoe

scripts/ci/check_compliance.py

@@ -1264,6 +1264,8 @@ def check_no_undef_outside_kconfig(self, kconf):
         "FOO_SETTING_1",
         "FOO_SETTING_2",
         "GEN_UICR_GENERATE_PERIPHCONF", # Used in specialized build tool, not part of main Kconfig
+        "GEN_UICR_PROTECTEDMEM", # Used in specialized build tool, not part of main Kconfig
+        "GEN_UICR_PROTECTEDMEM_SIZE_BYTES", # Used in specialized build tool, not part of main Kconfig
         "GEN_UICR_SECONDARY", # Used in specialized build tool, not part of main Kconfig
         "GEN_UICR_SECONDARY_GENERATE_PERIPHCONF", # Used in specialized build tool, not part of main Kconfig
         "GEN_UICR_SECONDARY_PROCESSOR_VALUE", # Used in specialized build tool, not part of main Kconfig

soc/nordic/common/uicr/gen_uicr.py

@@ -25,6 +25,8 @@
 ENABLED_VALUE = 0xFFFF_FFFF
 DISABLED_VALUE = 0xBD23_28A8
 
+KB_4 = 4096
+
 
 class ScriptError(RuntimeError): ...
 
@@ -255,6 +257,16 @@ def main() -> None:
         type=lambda s: int(s, 0),
         help="Absolute flash address of the UICR region (decimal or 0x-prefixed hex)",
     )
+    parser.add_argument(
+        "--protectedmem",
+        action="store_true",
+        help="Enable protected memory region in UICR",
+    )
+    parser.add_argument(
+        "--protectedmem-size-bytes",
+        type=int,
+        help="Protected memory size in bytes (must be divisible by 4096)",
+    )
     parser.add_argument(
         "--secondary",
         action="store_true",
@@ -339,6 +351,16 @@ def main() -> None:
         uicr.VERSION.MAJOR = UICR_FORMAT_VERSION_MAJOR
         uicr.VERSION.MINOR = UICR_FORMAT_VERSION_MINOR
 
+        # Handle protected memory configuration
+        if args.protectedmem:
+            if args.protectedmem_size_bytes % KB_4 != 0:
+                raise ScriptError(
+                    f"Protected memory size ({args.protectedmem_size_bytes} bytes) "
+                    f"must be divisible by 4096"
+                )
+            uicr.PROTECTEDMEM.ENABLE = ENABLED_VALUE
+            uicr.PROTECTEDMEM.SIZE4KB = args.protectedmem_size_bytes // KB_4
+
         # Process periphconf data first and configure UICR completely before creating hex objects
         periphconf_hex = IntelHex()
         secondary_periphconf_hex = IntelHex()

soc/nordic/common/uicr/gen_uicr/CMakeLists.txt

@@ -48,6 +48,7 @@ endfunction()
 if(CMAKE_VERBOSE_MAKEFILE)
 endif()
 
+set(protectedmem_args)
 set(periphconf_args)
 set(periphconf_elfs)
 set(merged_hex_file ${APPLICATION_BINARY_DIR}/zephyr/${CONFIG_KERNEL_BIN_NAME}.hex)
@@ -60,6 +61,12 @@ set(secondary_periphconf_hex_file ${APPLICATION_BINARY_DIR}/zephyr/secondary_per
 dt_nodelabel(uicr_path NODELABEL "uicr" REQUIRED)
 dt_reg_addr(UICR_ADDRESS PATH ${uicr_path} REQUIRED)
 
+# Handle protected memory configuration
+if(CONFIG_GEN_UICR_PROTECTEDMEM)
+  list(APPEND protectedmem_args --protectedmem)
+  list(APPEND protectedmem_args --protectedmem-size-bytes ${CONFIG_GEN_UICR_PROTECTEDMEM_SIZE_BYTES})
+endif()
+
 if(CONFIG_GEN_UICR_GENERATE_PERIPHCONF)
   # gen_uicr.py parses all zephyr.elf files. To find these files (which
   # have not been built yet) we scan sibling build directories for
@@ -135,6 +142,7 @@ add_custom_command(
           --out-merged-hex ${merged_hex_file}
           --out-uicr-hex ${uicr_hex_file}
           ${periphconf_args}
+          ${protectedmem_args}
           ${secondary_args}
   DEPENDS ${periphconf_elfs} ${secondary_periphconf_elfs}
   WORKING_DIRECTORY ${APPLICATION_BINARY_DIR}

soc/nordic/common/uicr/gen_uicr/Kconfig

@@ -10,6 +10,20 @@ config GEN_UICR_GENERATE_PERIPHCONF
 	  When enabled, the UICR generator will populate the
 	  periphconf_partition partition.
 
+config GEN_UICR_PROTECTEDMEM
+	bool "Enable UICR.PROTECTEDMEM"
+	help
+	  When enabled, the UICR generator will configure the
+	  protected memory region.
+
+config GEN_UICR_PROTECTEDMEM_SIZE_BYTES
+	int "Protected memory size in bytes"
+	default 4096
+	depends on GEN_UICR_PROTECTEDMEM
+	help
+	  Size of the protected memory region in bytes.
+	  This value must be divisible by 4096 (4 kiB).
+
 config GEN_UICR_SECONDARY
 	bool "Enable UICR.SECONDARY.ENABLE"