feat(tools): enable zc* extensions for esp32p4 revision >= 3.0

Author: Lapshin

components/esp_hw_support/CMakeLists.txt

@@ -190,7 +190,12 @@ endif()
 
 if(CONFIG_ESP32P4_SELECTS_REV_LESS_V3)
     if(CMAKE_C_COMPILER_ID MATCHES "GNU")
-        idf_build_set_property(COMPILE_OPTIONS "-mespv-spec=2p1" APPEND)
+        # 1. Set xespv2p1 explicitly to override the default xespv2p2.
+        # 2. Remove zc* extensions:
+        #    The ESP32-P4 has always supported the zc* extensions,
+        #    but revisions earlier than v3.0 are affected by hardware issue DIG-661
+        #    and lack the mintthresh_csr register needed for the workaround.
+        idf_build_set_property(COMPILE_OPTIONS "-march=rv32imafc_zicsr_zifencei_zaamo_zalrsc_xesploop_xespv2p1" APPEND)
     endif()
 elseif(CONFIG_IDF_TARGET_ESP32P4)
     if(CMAKE_C_COMPILER_ID MATCHES "Clang") # TODO: LLVM-478

tools/cmake/toolchain-esp32p4.cmake

@@ -7,7 +7,9 @@ set(CMAKE_CXX_COMPILER riscv32-esp-elf-g++)
 set(CMAKE_ASM_COMPILER riscv32-esp-elf-gcc)
 set(_CMAKE_TOOLCHAIN_PREFIX riscv32-esp-elf-)
 
-set(_CMAKE_TOOLCHAIN_COMMON_FLAGS "-march=rv32imafc_zicsr_zifencei_zaamo_zalrsc_xespv_xesploop -mabi=ilp32f")
+set(_CMAKE_TOOLCHAIN_COMMON_FLAGS "-march=rv32imafc_zicsr_zifencei_zaamo_zalrsc_zcb_zcmp_zcmt_xesploop_xespv \
+                                   -mabi=ilp32f \
+                                   -mno-cm-popret -mno-cm-push-reverse")
 
 remove_duplicated_flags("${_CMAKE_TOOLCHAIN_COMMON_FLAGS} -mtune=esp-base ${CMAKE_C_FLAGS}" UNIQ_CMAKE_C_FLAGS)
 set(CMAKE_C_FLAGS "${UNIQ_CMAKE_C_FLAGS}" CACHE STRING "C Compiler Base Flags" FORCE)