freertos(IDF): Add hidden build option for V10.5.1 kernel

This commit adds a "CONFIG_FREERTOS_USE_KERNEL_10_5_1" hidden option to enable
building of the v10.5.1 kernel for development/testing purposes. Currently
enabling this option will just cause CMake to error out.

Also added a markdown file to record the code changes made to the V10.5.1 source
when porting over SMP behavior.

components/freertos/CMakeLists.txt

@@ -31,7 +31,11 @@ idf_build_get_property(target IDF_TARGET)
 if(CONFIG_FREERTOS_SMP)
     set(kernel_impl "FreeRTOS-Kernel-SMP")
 else()
-    set(kernel_impl "FreeRTOS-Kernel")
+    if(CONFIG_FREERTOS_USE_KERNEL_10_5_1)
+        message(FATAL_ERROR "FreeRTOS v10.5.1 is not buildable yet. Still under development")
+    else()
+        set(kernel_impl "FreeRTOS-Kernel")
+    endif()
 endif()
 
 if(CONFIG_IDF_TARGET_ARCH_XTENSA)

components/freertos/FreeRTOS-Kernel-V10.5.1/idf_changes.md

@@ -0,0 +1,7 @@
+# ESP-IDF Changes
+
+This document is used to track all changes made the to FreeRTOS V10.5.1 source code when adding dual core SMP support or IDF additional features.
+
+## License Headers
+
+- Added `SPDX-FileCopyrightText` and `SPDX-FileContributor` tags to all files to pass ESP-IDF pre-commit checks.

components/freertos/Kconfig

@@ -3,8 +3,16 @@ menu "FreeRTOS"
     menu "Kernel"
         # Upstream FreeRTOS configurations go here
 
+        config FREERTOS_USE_KERNEL_10_5_1
+            bool "Use v10.5.1 Kernel (EXPERIMENTAL)"
+            depends on IDF_EXPERIMENTAL_FEATURES
+            default n
+            help
+                Hidden option for development/testing purposes to enable building with the v10.5.1 kernel
+
         config FREERTOS_SMP
             bool "Run the Amazon SMP FreeRTOS kernel instead (FEATURE UNDER DEVELOPMENT)"
+            depends on !FREERTOS_USE_KERNEL_10_5_1
             default  "n"
             help
                 Amazon has released an SMP version of the FreeRTOS Kernel which can be found via the following link: