MLECO-3225: Using official support for Arm Cortex-M85 CPU.

 * CMake version requirement bumped up to 3.21.0
   * CMake 3.22.4 installed in the local Python virtualenv
 * CPU flags updated in toolchain files.
 * Using __ARM_FEATURE_DSP instead of potentially defining
   ARM_MATH_DSP wrongly.
 * CMake project version bumped up to 22.05.0

Changes also made for MLECO-3107 (pack generation):

 * TensorFlow Lite Micro CMSIS-pack version updated to
   1.22.02.
 * Change to using __ARM_FEATURE_DSP will also help the
   generated pack.

Partial changes for MLECO-3095:

 * CMSIS updated to version post 5.9.0
 * TensorFlow Lite Micro updated to latest available
 * Ethos-U driver and core-platform repositories updated
   to 20.05_rc2 tags.

Change-Id: I012c9e65897aed8ce589cff9bfe3a19efc3edeb9
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>

2 files changed, 36 insertions, 33 deletions

diff --git a/scripts/cmake/toolchains/bare-metal-armclang.cmake b/scripts/cmake/toolchains/bare-metal-armclang.cmake
index 97da76f..3db3320 100644
--- a/scripts/cmake/toolchains/bare-metal-armclang.cmake
+++ b/scripts/cmake/toolchains/bare-metal-armclang.cmake
@@ -25,40 +25,46 @@ set(CMAKE_ASM_COMPILER_AR           armar)
 set(CMAKE_CROSSCOMPILING            true)
 set(CMAKE_SYSTEM_NAME               Generic)
 
-set(MIN_ARM_CLANG_VERSION           6.16)
-
 # Skip compiler test execution
 set(CMAKE_C_COMPILER_WORKS          1)
 set(CMAKE_CXX_COMPILER_WORKS        1)
 
 if (NOT DEFINED CMAKE_SYSTEM_PROCESSOR AND NOT DEFINED CMAKE_SYSTEM_ARCH)
-    set(CMAKE_SYSTEM_PROCESSOR      cortex-m55)
+    set(CMAKE_SYSTEM_PROCESSOR      cortex-m55 CACHE STRING "Cortex-M CPU to use")
 endif()
 
 if (CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m55)
     # Flags for cortex-m55
+    set(MIN_ARM_CLANG_VERSION       6.16)
     set(CPU_ID                      M55)
     set(CPU_COMPILE_DEF             CPU_CORTEX_${CPU_ID})
     set(ARM_CPU                     "ARMC${CPU_ID}")
-    set(FLOAT_ABI                   hard)
-    set(ARM_MATH_DSP                1)
-    set(ARM_MATH_LOOPUNROLL         1)
     set(CPU_HEADER_FILE             "${ARM_CPU}.h")
     set(CPU_COMPILE_OPTION          "-mcpu=${CMAKE_SYSTEM_PROCESSOR}")
+    set(FLOAT_ABI_COMPILE_OPTION    "-mfloat-abi=hard")
+    set(CPU_LINK_OPT                "--cpu=Cortex-${CPU_ID}")
+elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m85)
+    # Flags for cortex-m85
+    set(MIN_ARM_CLANG_VERSION       6.18)
+    set(CPU_ID                      M85)
+    set(CPU_COMPILE_DEF             CPU_CORTEX_${CPU_ID})
+    set(ARM_CPU                     "ARMC${CPU_ID}")
+    set(CPU_HEADER_FILE             "${ARM_CPU}.h")
+    set(CPU_COMPILE_OPTION          "-mcpu=${CMAKE_SYSTEM_PROCESSOR}")
+    set(FLOAT_ABI_COMPILE_OPTION    "-mfloat-abi=hard")
     set(CPU_LINK_OPT                "--cpu=Cortex-${CPU_ID}")
-elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m85 OR CMAKE_SYSTEM_ARCH STREQUAL armv8.1-m.main)
-    # Flags for Cortex-M85
+elseif (CMAKE_SYSTEM_ARCH STREQUAL armv8.1-m.main)
+    # Flags for generic armv8.1-m profile
+    set(MIN_ARM_CLANG_VERSION       6.16)
     set(CPU_ID                      ARMv81MML_DSP_DP_MVE_FP)
     set(ARM_CPU                     "ARMv81MML")
     set(CPU_COMPILE_DEF             ${CPU_ID})
-    set(FLOAT_ABI                   hard)
-    set(ARM_MATH_DSP                1)
-    set(ARM_MATH_LOOPUNROLL         1)
 
     # @TODO: Revise once we have the CPU file in CMSIS and CPU flags
     # are supported by toolchains.
     set(CPU_HEADER_FILE             "${CPU_ID}.h")
     set(CPU_COMPILE_OPTION          "-march=armv8.1-m.main+mve.fp+fp.dp")
+    set(FLOAT_ABI_COMPILE_OPTION    "-mfloat-abi=hard")
     set(CPU_LINK_OPT                "--cpu=8.1-M.Main.mve.fp")
 elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m33)
     # Flags for cortex-m33 to go here
@@ -81,18 +87,16 @@ add_compile_options(
 # Arch compile options:
 add_compile_options(
     -mthumb
-    -mfloat-abi=${FLOAT_ABI}
     --target=arm-arm-non-eabi
     -mlittle-endian
     -MD
-    ${CPU_COMPILE_OPTION})
+    ${CPU_COMPILE_OPTION}
+    ${FLOAT_ABI_COMPILE_OPTION})
 
 # Compile definitions:
 add_compile_definitions(
     CPU_HEADER_FILE=\"${CPU_HEADER_FILE}\"
-    $<$<BOOL:${CPU_COMPILE_DEF}>:${CPU_COMPILE_DEF}>
-    $<$<BOOL:${ARM_MATH_DSP}>:ARM_MATH_DSP>
-    $<$<BOOL:${ARM_MATH_LOOPUNROLL}>:ARM_MATH_LOOPUNROLL>)
+    $<$<BOOL:${CPU_COMPILE_DEF}>:${CPU_COMPILE_DEF}>)
 
 # Link options:
 add_link_options(${CPU_LINK_OPT})
diff --git a/scripts/cmake/toolchains/bare-metal-gcc.cmake b/scripts/cmake/toolchains/bare-metal-gcc.cmake
index a6d6c0e..9c1cd4f 100644
--- a/scripts/cmake/toolchains/bare-metal-gcc.cmake
+++ b/scripts/cmake/toolchains/bare-metal-gcc.cmake
@@ -30,7 +30,7 @@ set(CMAKE_C_COMPILER_WORKS          1)
 set(CMAKE_CXX_COMPILER_WORKS        1)
 
 if (NOT DEFINED CMAKE_SYSTEM_PROCESSOR AND NOT DEFINED CMAKE_SYSTEM_ARCH)
-    set(CMAKE_SYSTEM_PROCESSOR      cortex-m55)
+    set(CMAKE_SYSTEM_PROCESSOR      cortex-m55 CACHE STRING "Cortex-M CPU to use")
 endif()
 
 if (CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m55)
@@ -38,25 +38,26 @@ if (CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m55)
     set(CPU_ID                      M55)
     set(CPU_COMPILE_DEF             CPU_CORTEX_${CPU_ID})
     set(ARM_CPU                     "ARMC${CPU_ID}")
-    set(FLOAT_ABI                   hard)
-    set(ARM_MATH_DSP                1)
-    set(ARM_MATH_LOOPUNROLL         1)
     set(CPU_HEADER_FILE             "${ARM_CPU}.h")
     set(CPU_COMPILE_OPTION          "-mcpu=${CMAKE_SYSTEM_PROCESSOR}")
+    set(FLOAT_ABI_COMPILE_OPTION    "-mfloat-abi=hard")
     set(CPU_LINK_OPT                "--cpu=Cortex-${CPU_ID}")
-elseif (CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m85 OR CMAKE_SYSTEM_ARCH STREQUAL armv8.1-m.main)
-    # Flags for Cortex-M85
+elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m85)
+    # Flags for cortex-m85
+    # @TODO: Current versions of GNU compiler do not support Cortex-M85, we compile for Cortex-M55 instead.
+    message(WARNING                 "Arm GNU Toolchain does not support Arm Cortex-M85 yet, switching to Cortex-M55.")
+    set(CMAKE_SYSTEM_PROCESSOR      cortex-m55 CACHE STRING "Cortex-M CPU to use" FORCE)
+    # No need to duplicate the definitions here.
+    # Flags from Cortex-M55 will be added as this toolchain file will be read by CMake again.
+elseif (CMAKE_SYSTEM_ARCH STREQUAL armv8.1-m.main)
+    # Flags for generic target armv8.1-m.main (will work for cortex-m55 and cortex-m85
     set(CPU_ID                      ARMv81MML_DSP_DP_MVE_FP)
     set(ARM_CPU                     "ARMv81MML")
     set(CPU_COMPILE_DEF             ${CPU_ID})
     set(FLOAT_ABI                   hard)
-    set(ARM_MATH_DSP                1)
-    set(ARM_MATH_LOOPUNROLL         1)
-
-    # @TODO: Revise once we have the CPU file in CMSIS and CPU flags
-    # are supported by toolchains.
     set(CPU_HEADER_FILE             "${CPU_ID}.h")
     set(CPU_COMPILE_OPTION          "-march=armv8.1-m.main+mve.fp+fp.dp")
+    set(FLOAT_ABI_COMPILE_OPTION    "-mfloat-abi=hard")
     set(CPU_LINK_OPT                "--cpu=8.1-M.Main.mve.fp")
 elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL cortex-m33)
     # Flags for cortex-m33 to go here
@@ -81,23 +82,21 @@ add_compile_options(
 # Arch compile options:
 add_compile_options(
     -mthumb
-    -mfloat-abi=${FLOAT_ABI}
     -mlittle-endian
     -MD
+    ${FLOAT_ABI_COMPILE_OPTION}
     ${CPU_COMPILE_OPTION})
 
 # Compile definitions:
 add_compile_definitions(
-    CPU_HEADER_FILE=\"${CPU_HEADER_FILE}\"
-    $<$<BOOL:${CPU_COMPILE_DEF}>:${CPU_COMPILE_DEF}>
-    $<$<BOOL:${ARM_MATH_DSP}>:ARM_MATH_DSP>
-    $<$<BOOL:${ARM_MATH_LOOPUNROLL}>:ARM_MATH_LOOPUNROLL>)
+    $<$<BOOL:${CPU_HEADER_FILE}>:CPU_HEADER_FILE=\"${CPU_HEADER_FILE}\">
+    $<$<BOOL:${CPU_COMPILE_DEF}>:${CPU_COMPILE_DEF}>)
 
 # Link options:
 add_link_options(
     -mthumb
     ${CPU_COMPILE_OPTION}
-    -mfloat-abi=${FLOAT_ABI}
+    ${FLOAT_ABI_COMPILE_OPTION}
     -mlittle-endian
     --stats
     "SHELL:-Xlinker --gc-sections"