soc: imx93 m33: add tcm init

m33 must ensure the TCM is ECC clean by initializing all dtcm memories
Otherwise, it can only run it by loading m33 under uboot.
Based on this fixed, we can run M33 by mkimage into flash.bin.

Signed-off-by: Yongxu Wang <yongxu.wang@nxp.com>

soc/nxp/imx/imx9/imx93/CMakeLists.txt

@@ -12,4 +12,5 @@ elseif(CONFIG_SOC_MIMX9352_M33)
   zephyr_include_directories(m33)
   zephyr_sources(m33/soc.c)
   set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/arm/cortex_m/scripts/linker.ld CACHE INTERNAL "")
+  zephyr_library_sources_ifdef(CONFIG_SOC_RESET_HOOK m33/imx93_m33_startup.S)
 endif()

soc/nxp/imx/imx9/imx93/Kconfig

@@ -22,6 +22,7 @@ config SOC_MIMX9352_M33
 	select HAS_MCUX_IOMUXC if PINCTRL
 	select HAS_MCUX_CACHE
 	select SOC_EARLY_INIT_HOOK
+	select SOC_RESET_HOOK
 
 config MCUX_CORE_SUFFIX
 	default "_ca55" if SOC_MIMX9352_A55

soc/nxp/imx/imx9/imx93/m33/imx93_m33_startup.S

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2025 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/devicetree.h>
+#include <zephyr/toolchain.h>
+#include <zephyr/linker/sections.h>
+
+_ASM_FILE_PROLOGUE
+
+GTEXT(soc_reset_hook)
+
+SECTION_FUNC(TEXT, soc_reset_hook)
+
+	mov r0, #0
+	ldr r1, = DT_REG_ADDR(DT_NODELABEL(dtcm))
+	ldr r2, = DT_REG_ADDR(DT_NODELABEL(dtcm)) + DT_REG_SIZE(DT_NODELABEL(dtcm))
+DTCM_LOOP:
+	cmp r1, r2
+	itt lt
+	strlt r0, [r1], #4
+	blt DTCM_LOOP
+
+	bx lr