board: nxp: imx9{4, 5, 52}_evk: Add qb save option in SPL

Call qb save automatically in the board-specific
spl_board_init(), if SPL_IMX_QB option is enabled.
This makes sure qb_save is called before any image
loading is done by the SPL. This option is also
suitable for the case where U-Boot proper is
missing (Falcon mode).

qb save refers to saving DDR training data to NVM,
so that OEI runs Quickboot flow on next reboot,
skipping full training and achieveing a lower boot
time.

Signed-off-by: Simona Toaca <simona.toaca@nxp.com>

arch/arm/mach-imx/Kconfig

@@ -80,6 +80,14 @@ config IMX_QB
 	  memory to non-volatile storage. OEI uses the saved data to
 	  run Quickboot flow and skip re-training the DDR PHY.
 
+config SPL_IMX_QB
+	bool "Run qb save during SPL"
+	depends on SPL && IMX_QB
+	help
+	  Automatically save DDR training data (Quickboot data)
+	  to current boot device when needed (when OEI runs Training
+	  flow and saves qb data to volatile memory).
+
 config CMD_IMX_QB
 	bool "Support the 'qb' command"
 	default y

board/nxp/imx94_evk/spl.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright 2025 NXP
+ * Copyright 2025-2026 NXP
  */
 
 #include <hang.h>
@@ -14,6 +14,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/mach-imx/boot_mode.h>
 #include <asm/mach-imx/ele_api.h>
+#include <asm/mach-imx/qb.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -44,6 +45,9 @@ void spl_board_init(void)
 	ret = ele_start_rng();
 	if (ret)
 		printf("Fail to start RNG: %d\n", ret);
+
+	if (IS_ENABLED(CONFIG_SPL_IMX_QB))
+		spl_imx_qb_save();
 }
 
 static void xspi_nor_reset(void)

board/nxp/imx952_evk/spl.c

@@ -8,6 +8,7 @@
 #include <asm/gpio.h>
 #include <asm/mach-imx/boot_mode.h>
 #include <asm/mach-imx/ele_api.h>
+#include <asm/mach-imx/qb.h>
 #include <asm/sections.h>
 #include <hang.h>
 #include <init.h>
@@ -44,6 +45,9 @@ void spl_board_init(void)
 	ret = ele_start_rng();
 	if (ret)
 		printf("Fail to start RNG: %d\n", ret);
+
+	if (IS_ENABLED(CONFIG_SPL_IMX_QB))
+		spl_imx_qb_save();
 }
 
 static void xspi_nor_reset(void)

board/nxp/imx95_evk/spl.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright 2025 NXP
+ * Copyright 2025-2026 NXP
  */
 
 #include <hang.h>
@@ -13,6 +13,7 @@
 #include <asm/arch/sys_proto.h>
 #include <asm/mach-imx/boot_mode.h>
 #include <asm/mach-imx/ele_api.h>
+#include <asm/mach-imx/qb.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -41,6 +42,9 @@ void spl_board_init(void)
 	ret = ele_start_rng();
 	if (ret)
 		printf("Fail to start RNG: %d\n", ret);
+
+	if (IS_ENABLED(CONFIG_SPL_IMX_QB))
+		spl_imx_qb_save();
 }
 
 void board_init_f(ulong dummy)