cmake: support armv8r target for Cortex-R52

This commit adds Rust build support for the Cortex-R52 CPU type.

Signed-off-by: Matthew Richey <[email protected]>

Author: matthewjrichey

CMakeLists.txt

@@ -49,6 +49,15 @@ function(_rust_map_target)
     else()
       message(FATAL_ERROR "Rust: Unsupported riscv ISA")
     endif()
+  elseif(CONFIG_CPU_CORTEX_R52)
+    set(RUST_TARGET "armv8r-none-eabihf" PARENT_SCOPE)
+
+    # build core (and maybe also alloc) from source for tier 3 target
+    if(CONFIG_RUST_ALLOC)
+      set(CARGO_EXTRA_FLAGS -Z build-std=core,alloc PARENT_SCOPE)
+    else()
+      set(CARGO_EXTRA_FLAGS -Z build-std=core PARENT_SCOPE)
+    endif()
   else()
     message(FATAL_ERROR "Rust: Add support for other target")
   endif()
@@ -182,6 +191,7 @@ ${config_paths}
       ${command_paths}
       --target ${RUST_TARGET}
       --target-dir ${CARGO_TARGET_DIR}
+      ${CARGO_EXTRA_FLAGS}
     COMMENT "Building Rust application"
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
   )

Kconfig

@@ -8,6 +8,7 @@ menu "Rust Language Support"
 config RUST_SUPPORTED
 	bool
 	default y if ((CPU_CORTEX_M || \
+		       CPU_CORTEX_R52 || \
 				(RISCV && !RISCV_ISA_RV32E && !RISCV_ISA_RV128I)) && \
 				!TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
 	help