diff --git a/arch/xtensa/src/esp32/Kconfig b/arch/xtensa/src/esp32/Kconfig
index baa95be1594..6c5416adec4 100644
--- a/arch/xtensa/src/esp32/Kconfig
+++ b/arch/xtensa/src/esp32/Kconfig
@@ -898,6 +898,16 @@ config ESP32_IRAM_HEAP
 	select ARCH_USE_TEXT_HEAP
 	default n
 
+config ESP32_DONT_USE_ROM_LIBC
+	bool "Don't use ROM libc functions"
+	default n
+	---help---
+		If enabled, NuttX libc will be used instead of ROM newlib
+		functions (strdup, strndup, atoi, etc.).
+
+		This is required when using flat build with USER_HEAP mode
+		to avoid heap allocation issues with ROM strdup.
+
 endmenu # Memory Configuration
 
 config ESP32_GPIO_IRQ
@@ -1929,6 +1939,7 @@ config ESP32_SPI_FLASH_SUPPORT_PSRAM_STACK
 	default n
 	depends on ESP32_SPIRAM
 	select SCHED_LPWORK
+	select ESP32_DONT_USE_ROM_LIBC
 	---help---
 		Enable this option, Tasks which use PSRAM as stack
 		can do SPI Flash read/write/erase/map/unmap.
diff --git a/arch/xtensa/src/esp32/hal.mk b/arch/xtensa/src/esp32/hal.mk
index 56ba95d7de7..71d3e575643 100644
--- a/arch/xtensa/src/esp32/hal.mk
+++ b/arch/xtensa/src/esp32/hal.mk
@@ -162,10 +162,11 @@ ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)
 ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)esp_rom$(DELIM)$(CHIP_SERIES)$(DELIM)ld$(DELIM)$(CHIP_SERIES).rom.libc-funcs.ld
 ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)esp_rom$(DELIM)$(CHIP_SERIES)$(DELIM)ld$(DELIM)$(CHIP_SERIES).rom.libgcc.ld
 ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)esp_rom$(DELIM)$(CHIP_SERIES)$(DELIM)ld$(DELIM)$(CHIP_SERIES).rom.newlib-data.ld
-ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)esp_rom$(DELIM)$(CHIP_SERIES)$(DELIM)ld$(DELIM)$(CHIP_SERIES).rom.newlib-reent-funcs.ld
 ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)esp_rom$(DELIM)$(CHIP_SERIES)$(DELIM)ld$(DELIM)$(CHIP_SERIES).rom.syscalls.ld
 ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)soc$(DELIM)$(CHIP_SERIES)$(DELIM)ld$(DELIM)$(CHIP_SERIES).peripherals.ld
-
+ifeq ($(CONFIG_ESP32_DONT_USE_ROM_LIBC),)
+ARCHSCRIPT += $(ARCH_SRCDIR)$(DELIM)chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)esp_rom$(DELIM)$(CHIP_SERIES)$(DELIM)ld$(DELIM)$(CHIP_SERIES).rom.newlib-reent-funcs.ld
+endif
 # Source files
 
 CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)efuse$(DELIM)src$(DELIM)esp_efuse_api.c