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https://github.com/espressif/esp-idf.git
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esp32: Add support for noinit variables in SPIRAM
Add Kconfig option SPIRAM_ALLOW_NOINIT_EXTERNAL_MEMORY When enabled, a new linker script rule (from esp32.extram.noinit.ld) places any variables in the .ext_ram.noinit section in SPIRAM. This section is exempted from the startup SPIRAM memory test and is not zero-initialized or added to the malloc pool, making it usable for noinit variables that persist across reset. The EXT_RAM_NOINIT_ATTR macro places variables in this section.
This commit is contained in:
Devan Lai
committed by
Armando (Dou Yiwen)
Armando (Dou Yiwen)
parent
47e1b41563
commit
b85011c15f
@@ -3,10 +3,89 @@ if(NOT "${target}" STREQUAL "esp32")
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return()
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endif()
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if(NOT BOOTLOADER_BUILD)
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# [refactor-todo] propagate these requirements for compatibility
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# remove in the future
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set(legacy_reqs driver efuse soc)
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idf_build_get_property(sdkconfig_header SDKCONFIG_HEADER)
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if(BOOTLOADER_BUILD)
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# For bootloader, all we need from esp32 is headers
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idf_component_register(INCLUDE_DIRS include REQUIRES xtensa)
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target_linker_script(${COMPONENT_LIB} INTERFACE "ld/esp32.peripherals.ld")
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else()
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# Regular app build
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set(srcs
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"cache_sram_mmu.c"
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"dport_access.c"
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"esp_himem.c"
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"spiram.c"
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"spiram_psram.c")
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set(include_dirs "include")
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set(requires driver efuse soc xtensa) #unfortunately rom/uart uses SOC registers directly
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# app_update is added here because cpu_start.c uses esp_ota_get_app_description() function.
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# esp_timer is added here because cpu_start.c uses esp_timer
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set(priv_requires app_trace app_update bootloader_support esp_system log mbedtls nvs_flash pthread
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spi_flash vfs espcoredump esp_common perfmon esp_timer esp_ipc esp_pm)
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idf_component_register(SRCS "${srcs}"
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INCLUDE_DIRS "${include_dirs}"
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REQUIRES "${requires}"
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PRIV_REQUIRES "${priv_requires}"
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REQUIRED_IDF_TARGETS esp32)
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target_linker_script(${COMPONENT_LIB} INTERFACE "${CMAKE_CURRENT_BINARY_DIR}/esp32_out.ld")
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if(CONFIG_SPIRAM_ALLOW_NOINIT_EXTERNAL_MEMORY)
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# This has to be linked before esp32.project.ld
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target_linker_script(${COMPONENT_LIB} INTERFACE "ld/esp32.extram.noinit.ld")
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endif()
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# Process the template file through the linker script generation mechanism, and use the output for linking the
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# final binary
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target_linker_script(${COMPONENT_LIB} INTERFACE "${CMAKE_CURRENT_LIST_DIR}/ld/esp32.project.ld.in"
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PROCESS "${CMAKE_CURRENT_BINARY_DIR}/ld/esp32.project.ld")
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target_linker_script(${COMPONENT_LIB} INTERFACE "ld/esp32.peripherals.ld")
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target_link_libraries(${COMPONENT_LIB} PUBLIC gcc)
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target_link_libraries(${COMPONENT_LIB} INTERFACE "-u call_user_start_cpu0")
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idf_build_get_property(config_dir CONFIG_DIR)
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# Preprocess esp32.ld linker script to include configuration, becomes esp32_out.ld
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set(LD_DIR ${CMAKE_CURRENT_SOURCE_DIR}/ld)
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add_custom_command(
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OUTPUT esp32_out.ld
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COMMAND "${CMAKE_C_COMPILER}" -C -P -x c -E -o esp32_out.ld -I ${config_dir} ${LD_DIR}/esp32.ld
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MAIN_DEPENDENCY ${LD_DIR}/esp32.ld
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DEPENDS ${sdkconfig_header}
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COMMENT "Generating linker script..."
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VERBATIM)
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add_custom_target(esp32_linker_script DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/esp32_out.ld)
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add_dependencies(${COMPONENT_LIB} esp32_linker_script)
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if(CONFIG_SPIRAM_CACHE_WORKAROUND)
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# Note: Adding as a PUBLIC compile option here causes this option to propagate to all
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# components that depend on esp32.
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#
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# To handle some corner cases, the same flag is set in project_include.cmake
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target_compile_options(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-issue)
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# also, make sure we link with this option so correct toolchain libs are pulled in
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target_link_libraries(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-issue)
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# set strategy selected
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# note that we don't need to set link options as the library linked is independent of this
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if(CONFIG_SPIRAM_CACHE_WORKAROUND_STRATEGY_DUPLDST)
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target_compile_options(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-strategy=dupldst)
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target_link_libraries(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-strategy=dupldst)
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endif()
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if(CONFIG_SPIRAM_CACHE_WORKAROUND_STRATEGY_MEMW)
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target_compile_options(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-strategy=memw)
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target_link_libraries(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-strategy=memw)
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endif()
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if(CONFIG_SPIRAM_CACHE_WORKAROUND_STRATEGY_NOPS)
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target_compile_options(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-strategy=nops)
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target_link_libraries(${COMPONENT_LIB} PUBLIC -mfix-esp32-psram-cache-strategy=nops)
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endif()
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endif()
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endif()
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idf_component_register(INCLUDE_DIRS include
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@@ -1,3 +1,39 @@
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#
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# Component Makefile
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#
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COMPONENT_SRCDIRS := .
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ifdef CONFIG_SPIRAM_ALLOW_NOINIT_EXTERNAL_MEMORY
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# This linker script must come before esp32.project.ld
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LINKER_SCRIPTS += esp32.extram.noinit.ld
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endif
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#Linker scripts used to link the final application.
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#Warning: These linker scripts are only used when the normal app is compiled; the bootloader
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#specifies its own scripts.
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LINKER_SCRIPTS += $(COMPONENT_BUILD_DIR)/esp32.project.ld esp32.peripherals.ld
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#ld_include_panic_highint_hdl is added as an undefined symbol because otherwise the
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#linker will ignore panic_highint_hdl.S as it has no other files depending on any
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#symbols in it.
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COMPONENT_ADD_LDFLAGS += -L $(COMPONENT_PATH)/ld \
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-T esp32_out.ld \
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-u ld_include_panic_highint_hdl \
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$(addprefix -T ,$(LINKER_SCRIPTS)) \
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# final linking of project ELF depends on all binary libraries, and
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# all linker scripts (except esp32_out.ld, as this is code generated here.)
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COMPONENT_ADD_LINKER_DEPS := $(addprefix ld/, $(filter-out $(COMPONENT_BUILD_DIR)/esp32.project.ld, $(LINKER_SCRIPTS))) \
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$(COMPONENT_BUILD_DIR)/esp32.project.ld
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# Preprocess esp32.ld linker script into esp32_out.ld
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#
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# The library doesn't really depend on esp32_out.ld, but it
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# saves us from having to add the target to a Makefile.projbuild
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$(COMPONENT_LIBRARY): esp32_out.ld
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esp32_out.ld: $(COMPONENT_PATH)/ld/esp32.ld ../include/sdkconfig.h
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$(CC) -I ../include -C -P -x c -E $< -o $@
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COMPONENT_EXTRA_CLEAN := esp32_out.ld $(COMPONENT_BUILD_DIR)/esp32.project.ld
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