drivers: memc: stm32 xspi: add psram linker section

Add stm32_psram PSRAM linker section.

Signed-off-by: Hugues Fruchet <hugues.fruchet@foss.st.com>

drivers/memc/CMakeLists.txt

@@ -7,6 +7,7 @@ zephyr_library_sources_ifdef(CONFIG_MEMC_STM32_SDRAM memc_stm32_sdram.c)
 zephyr_linker_sources_ifdef(CONFIG_MEMC_STM32_SDRAM SECTIONS memc_stm32_sdram.ld)
 zephyr_library_sources_ifdef(CONFIG_MEMC_STM32_NOR_PSRAM memc_stm32_nor_psram.c)
 zephyr_library_sources_ifdef(CONFIG_MEMC_STM32_XSPI_PSRAM memc_stm32_xspi_psram.c)
+zephyr_linker_sources_ifdef(CONFIG_MEMC_STM32_XSPI_PSRAM SECTIONS memc_stm32_xspi_psram.ld)
 
 zephyr_library_sources_ifdef(CONFIG_MEMC_MCUX_FLEXSPI memc_mcux_flexspi.c)
 zephyr_library_sources_ifdef(CONFIG_MEMC_MCUX_FLEXSPI_W956A8MBYA memc_mcux_flexspi_w956a8mbya.c)

drivers/memc/memc_stm32_xspi_psram.ld

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(psram), okay)
+GROUP_START(PSRAM)
+
+	SECTION_PROLOGUE(_STM32_PSRAM_SECTION_NAME, (NOLOAD),)
+	{
+		*(.stm32_psram)
+		*(".stm32_psram.*")
+	} GROUP_LINK_IN(PSRAM)
+
+GROUP_END(PSRAM)
+#endif

include/zephyr/linker/section_tags.h

@@ -47,6 +47,7 @@
 #define __imx_boot_container_section Z_GENERIC_SECTION(_IMX_BOOT_CONTAINER_SECTION_NAME)
 #define __stm32_sdram1_section Z_GENERIC_SECTION(_STM32_SDRAM1_SECTION_NAME)
 #define __stm32_sdram2_section Z_GENERIC_SECTION(_STM32_SDRAM2_SECTION_NAME)
+#define __stm32_psram_section Z_GENERIC_SECTION(_STM32_PSRAM_SECTION_NAME)
 #define __stm32_backup_sram_section Z_GENERIC_SECTION(_STM32_BACKUP_SRAM_SECTION_NAME)
 #endif /* CONFIG_ARM */
 

include/zephyr/linker/sections.h

@@ -71,6 +71,7 @@
 
 #define _STM32_SDRAM1_SECTION_NAME	.stm32_sdram1
 #define _STM32_SDRAM2_SECTION_NAME	.stm32_sdram2
+#define _STM32_PSRAM_SECTION_NAME	.stm32_psram
 
 #define _STM32_BACKUP_SRAM_SECTION_NAME	.stm32_backup_sram