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cpu/esp32: enable SPI RAM cache workaround for ESP32 #23028

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cpu/esp32: enable SPI RAM cache workaround for ESP32 #23028

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10 changes: 10 additions & 0 deletions cpu/esp32/Makefile.include
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Original file line number Diff line number Diff line change
Expand Up @@ -203,6 +203,16 @@ endif

ifneq (,$(filter esp_spi_ram,$(USEMODULE)))
INCLUDES += -I$(ESP32_SDK_DIR)/components/esp_psram/include
ifeq (esp32,$(CPU_FAM))
# Workaround for the SPI RAM cache bug of ESP32 revisions < 3
# (CONFIG_SPIRAM_CACHE_WORKAROUND): The compiler avoids the vulnerable
# instruction sequences, and the linker uses the multilib variants of
# libc and libgcc that are compiled with this workaround.
PSRAM_WORKAROUND_FLAGS = -mfix-esp32-psram-cache-issue
PSRAM_WORKAROUND_FLAGS += -mfix-esp32-psram-cache-strategy=memw
CFLAGS += $(PSRAM_WORKAROUND_FLAGS)
LINKFLAGS += $(PSRAM_WORKAROUND_FLAGS)
endif
endif

ifneq (,$(filter esp_idf_lcd,$(USEMODULE)))
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