[EFR32] Adjust the internal flash layout (#19523)

* Do not initialize the certificate pointer in ApplicationProperties_t

The certificate pointer is updated when the certificate is actually injected into the image, there is no need to initialize it at compile time

* Reserve the last page of the flash for the manufacturing tokens

* Remove merge artifacts

examples/platform/efr32/OTAConfig.cpp

@@ -21,19 +21,6 @@
 #include "platform/bootloader/api/application_properties.h"
 #include <app/server/Server.h>
 
-#define BOOTLOADER_SUPPORT_CERTIFICATES 1
-#define APPLICATION_CERTIFICATE_VERSION (1UL)
-
-#if defined(BOOTLOADER_SUPPORT_CERTIFICATES)
-const ApplicationCertificate_t sl_app_certificate = {
-    .structVersion = APPLICATION_CERTIFICATE_VERSION,
-    .flags         = { 0U },
-    .key           = { 0U },
-    .version       = 0,
-    .signature     = { 0U },
-};
-#endif
-
 // Header used for building the image GBL file
 #define APP_PROPERTIES_VERSION 1
 #define APP_PROPERTIES_ID                                                                                                          \
@@ -71,15 +58,11 @@ __attribute__((used)) ApplicationProperties_t sl_app_properties = {
       /// Unique ID (e.g. UUID/GUID) for the product this application is built for
       .productId = APP_PROPERTIES_ID,
     },
-#if defined(BOOTLOADER_SUPPORT_CERTIFICATES)
-  // If certificate based boot chain is enabled, the bootloader binary will be provided with
-  // a certificate that does not contain any key.
-  // A valid certificate needs to be injected to the bootloader images using Simplicity Commander.
-  // Simplicity Commander will replace this certificate.
-    .cert = (ApplicationCertificate_t *)&sl_app_certificate,
-#else
+
+    /// Pointer to information about the certificate
     .cert = NULL,
-#endif
+
+    /// Pointer to Long Token Data Section
     .longTokenSectionAddress = NULL,
 };
 

examples/platform/efr32/ldscripts/efr32mg12.ld

@@ -255,6 +255,7 @@ SECTIONS
     KEEP(*(.simee*))
   } > FLASH
 
+  /* Last page of flash is reserved for the manufacturing token space */
   linker_nvm_end = __main_flash_end__ - 2048;
   linker_nvm_begin = linker_nvm_end - SIZEOF(.nvm);
   linker_nvm_size = SIZEOF(.nvm);

examples/platform/efr32/ldscripts/efr32mg24.ld

@@ -255,7 +255,8 @@ SECTIONS
     KEEP(*(.simee*))
   } > FLASH
 
-  linker_nvm_end = __main_flash_end__;
+  /* Last page of flash is reserved for the manufacturing token space */
+  linker_nvm_end = __main_flash_end__ - 8192;
   linker_nvm_begin = linker_nvm_end - SIZEOF(.nvm);
   linker_nvm_size = SIZEOF(.nvm);
   __nvm3Base = linker_nvm_begin;