arch/arm/mach-stm32mp/cpu.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
 /*
  * Copyright (C) 2018, STMicroelectronics - All Rights Reserved
  */

 #define LOG_CATEGORY LOGC_ARCH

 #include <common.h>
 #include <clk.h>
 #include <cpu_func.h>
 #include <debug_uart.h>
 #include <env.h>
 #include <init.h>
 #include <log.h>
 #include <lmb.h>
 #include <misc.h>
 #include <net.h>
 #include <spl.h>
 #include <asm/io.h>
 #include <asm/arch/stm32.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/global_data.h>
 #include <dm/device.h>
 #include <dm/uclass.h>
 #include <linux/bitops.h>
 #include <linux/printk.h>

 /*
  * early TLB into the .data section so that it not get cleared
  * with 16kB allignment (see TTBR0_BASE_ADDR_MASK)
  */
 u8 early_tlb[PGTABLE_SIZE] __section(".data") __aligned(0x4000);

 struct lmb lmb;

 u32 get_bootmode(void)
 {
 	/* read bootmode from TAMP backup register */
 	return (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_MODE_MASK) >>
 		    TAMP_BOOT_MODE_SHIFT;
 }

 /*
  * weak function overidde: set the DDR/SYSRAM executable before to enable the
  * MMU and configure DACR, for early early_enable_caches (SPL or pre-reloc)
  */
 void dram_bank_mmu_setup(int bank)
 {
 	struct bd_info *bd = gd->bd;
 	int	i;
 	phys_addr_t start;
 	phys_size_t size;
 	bool use_lmb = false;
 	enum dcache_option option;

 	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
 /* STM32_SYSRAM_BASE exist only when SPL is supported */
 #ifdef CONFIG_SPL
 		start = ALIGN_DOWN(STM32_SYSRAM_BASE, MMU_SECTION_SIZE);
 		size = ALIGN(STM32_SYSRAM_SIZE, MMU_SECTION_SIZE);
 #endif
 	} else if (gd->flags & GD_FLG_RELOC) {
 		/* bd->bi_dram is available only after relocation */
 		start = bd->bi_dram[bank].start;
 		size =  bd->bi_dram[bank].size;
 		use_lmb = true;
 	} else {
 		/* mark cacheable and executable the beggining of the DDR */
 		start = STM32_DDR_BASE;
 		size = CONFIG_DDR_CACHEABLE_SIZE;
 	}

 	for (i = start >> MMU_SECTION_SHIFT;
 	     i < (start >> MMU_SECTION_SHIFT) + (size >> MMU_SECTION_SHIFT);
 	     i++) {
 		option = DCACHE_DEFAULT_OPTION;
 		if (use_lmb && lmb_is_reserved_flags(&lmb, i << MMU_SECTION_SHIFT, LMB_NOMAP))
 			option = 0; /* INVALID ENTRY in TLB */
 		set_section_dcache(i, option);
 	}
 }
 /*
  * initialize the MMU and activate cache in SPL or in U-Boot pre-reloc stage
  * MMU/TLB is updated in enable_caches() for U-Boot after relocation
  * or is deactivated in U-Boot entry function start.S::cpu_init_cp15
  */
 static void early_enable_caches(void)
 {
 	/* I-cache is already enabled in start.S: cpu_init_cp15 */

 	if (CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
 		return;

 	if (!(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))) {
 		gd->arch.tlb_size = PGTABLE_SIZE;
 		gd->arch.tlb_addr = (unsigned long)&early_tlb;
 	}

 	/* enable MMU (default configuration) */
 	dcache_enable();
 }

 /*
  * Early system init
  */
 int arch_cpu_init(void)
 {
 	early_enable_caches();

 	/* early armv7 timer init: needed for polling */
 	timer_init();

 	return 0;
 }

 /* weak function for SOC specific initialization */
 __weak void stm32mp_cpu_init(void)
 {
 }

 int mach_cpu_init(void)
 {
 	u32 boot_mode;

 	stm32mp_cpu_init();

 	boot_mode = get_bootmode();

 	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) &&
 	    (boot_mode & TAMP_BOOT_DEVICE_MASK) == BOOT_SERIAL_UART)
 		gd->flags |= GD_FLG_SILENT | GD_FLG_DISABLE_CONSOLE;
 	else if (IS_ENABLED(CONFIG_DEBUG_UART) && IS_ENABLED(CONFIG_SPL_BUILD))
 		debug_uart_init();

 	return 0;
 }

 void enable_caches(void)
 {
 	/* parse device tree when data cache is still activated */
 	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);

 	/* I-cache is already enabled in start.S: icache_enable() not needed */

 	/* deactivate the data cache, early enabled in arch_cpu_init() */
 	dcache_disable();
 	/*
 	 * update MMU after relocation and enable the data cache
 	 * warning: the TLB location udpated in board_f.c::reserve_mmu
 	 */
 	dcache_enable();
 }

 /* used when CONFIG_DISPLAY_CPUINFO is activated */
 int print_cpuinfo(void)
 {
 	char name[SOC_NAME_SIZE];

 	get_soc_name(name);
 	printf("CPU: %s\n", name);

 	return 0;
 }

 static void setup_boot_mode(void)
 {
 	const u32 serial_addr[] = {
 		STM32_USART1_BASE,
 		STM32_USART2_BASE,
 		STM32_USART3_BASE,
 		STM32_UART4_BASE,
 		STM32_UART5_BASE,
 		STM32_USART6_BASE,
 		STM32_UART7_BASE,
 		STM32_UART8_BASE
 	};
 	const u32 sdmmc_addr[] = {
 		STM32_SDMMC1_BASE,
 		STM32_SDMMC2_BASE,
 		STM32_SDMMC3_BASE
 	};
 	char cmd[60];
 	u32 boot_ctx = readl(TAMP_BOOT_CONTEXT);
 	u32 boot_mode =
 		(boot_ctx & TAMP_BOOT_MODE_MASK) >> TAMP_BOOT_MODE_SHIFT;
 	unsigned int instance = (boot_mode & TAMP_BOOT_INSTANCE_MASK) - 1;
 	u32 forced_mode = (boot_ctx & TAMP_BOOT_FORCED_MASK);
 	struct udevice *dev;

 	log_debug("%s: boot_ctx=0x%x => boot_mode=%x, instance=%d forced=%x\n",
 		  __func__, boot_ctx, boot_mode, instance, forced_mode);
 	switch (boot_mode & TAMP_BOOT_DEVICE_MASK) {
 	case BOOT_SERIAL_UART:
 		if (instance >= ARRAY_SIZE(serial_addr))
 			break;
 		/* serial : search associated node in devicetree */
 		sprintf(cmd, "serial@%x", serial_addr[instance]);
 		if (uclass_get_device_by_name(UCLASS_SERIAL, cmd, &dev)) {
 			/* restore console on error */
 			if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL))
 				gd->flags &= ~(GD_FLG_SILENT |
 					       GD_FLG_DISABLE_CONSOLE);
 			log_err("uart%d = %s not found in device tree!\n",
 				instance + 1, cmd);
 			break;
 		}
 		sprintf(cmd, "%d", dev_seq(dev));
 		env_set("boot_device", "serial");
 		env_set("boot_instance", cmd);

 		/* restore console on uart when not used */
 		if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) && gd->cur_serial_dev != dev) {
 			gd->flags &= ~(GD_FLG_SILENT |
 				       GD_FLG_DISABLE_CONSOLE);
 			log_info("serial boot with console enabled!\n");
 		}
 		break;
 	case BOOT_SERIAL_USB:
 		env_set("boot_device", "usb");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_FLASH_SD:
 	case BOOT_FLASH_EMMC:
 		if (instance >= ARRAY_SIZE(sdmmc_addr))
 			break;
 		/* search associated sdmmc node in devicetree */
 		sprintf(cmd, "mmc@%x", sdmmc_addr[instance]);
 		if (uclass_get_device_by_name(UCLASS_MMC, cmd, &dev)) {
 			printf("mmc%d = %s not found in device tree!\n",
 			       instance, cmd);
 			break;
 		}
 		sprintf(cmd, "%d", dev_seq(dev));
 		env_set("boot_device", "mmc");
 		env_set("boot_instance", cmd);
 		break;
 	case BOOT_FLASH_NAND:
 		env_set("boot_device", "nand");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_FLASH_SPINAND:
 		env_set("boot_device", "spi-nand");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_FLASH_NOR:
 		env_set("boot_device", "nor");
 		env_set("boot_instance", "0");
 		break;
 	default:
 		env_set("boot_device", "invalid");
 		env_set("boot_instance", "");
 		log_err("unexpected boot mode = %x\n", boot_mode);
 		break;
 	}

 	switch (forced_mode) {
 	case BOOT_FASTBOOT:
 		log_info("Enter fastboot!\n");
 		env_set("preboot", "env set preboot; fastboot 0");
 		break;
 	case BOOT_STM32PROG:
 		env_set("boot_device", "usb");
 		env_set("boot_instance", "0");
 		break;
 	case BOOT_UMS_MMC0:
 	case BOOT_UMS_MMC1:
 	case BOOT_UMS_MMC2:
 		log_info("Enter UMS!\n");
 		instance = forced_mode - BOOT_UMS_MMC0;
 		sprintf(cmd, "env set preboot; ums 0 mmc %d", instance);
 		env_set("preboot", cmd);
 		break;
 	case BOOT_RECOVERY:
 		env_set("preboot", "env set preboot; run altbootcmd");
 		break;
 	case BOOT_NORMAL:
 		break;
 	default:
 		log_debug("unexpected forced boot mode = %x\n", forced_mode);
 		break;
 	}

 	/* clear TAMP for next reboot */
 	clrsetbits_le32(TAMP_BOOT_CONTEXT, TAMP_BOOT_FORCED_MASK, BOOT_NORMAL);
 }

 /*
  * If there is no MAC address in the environment, then it will be initialized
  * (silently) from the value in the OTP.
  */
 __weak int setup_mac_address(void)
 {
 	int ret;
 	int i;
 	u32 otp[3];
 	uchar enetaddr[6];
 	struct udevice *dev;
 	int nb_eth, nb_otp, index;

 	if (!IS_ENABLED(CONFIG_NET))
 		return 0;

 	nb_eth = get_eth_nb();

 	/* 6 bytes for each MAC addr and 4 bytes for each OTP */
 	nb_otp = DIV_ROUND_UP(6 * nb_eth, 4);

 	ret = uclass_get_device_by_driver(UCLASS_MISC,
 					  DM_DRIVER_GET(stm32mp_bsec),
 					  &dev);
 	if (ret)
 		return ret;

 	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_MAC), otp, 4 * nb_otp);
 	if (ret < 0)
 		return ret;

 	for (index = 0; index < nb_eth; index++) {
 		/* MAC already in environment */
 		if (eth_env_get_enetaddr_by_index("eth", index, enetaddr))
 			continue;

 		for (i = 0; i < 6; i++)
 			enetaddr[i] = ((uint8_t *)&otp)[i + 6 * index];

 		if (!is_valid_ethaddr(enetaddr)) {
 			log_err("invalid MAC address %d in OTP %pM\n",
 				index, enetaddr);
 			return -EINVAL;
 		}
 		log_debug("OTP MAC address %d = %pM\n", index, enetaddr);
 		ret = eth_env_set_enetaddr_by_index("eth", index, enetaddr);
 		if (ret) {
 			log_err("Failed to set mac address %pM from OTP: %d\n",
 				enetaddr, ret);
 			return ret;
 		}
 	}

 	return 0;
 }

 static int setup_serial_number(void)
 {
 	char serial_string[25];
 	u32 otp[3] = {0, 0, 0 };
 	struct udevice *dev;
 	int ret;

 	if (env_get("serial#"))
 		return 0;

 	ret = uclass_get_device_by_driver(UCLASS_MISC,
 					  DM_DRIVER_GET(stm32mp_bsec),
 					  &dev);
 	if (ret)
 		return ret;

 	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_SERIAL),
 			otp, sizeof(otp));
 	if (ret < 0)
 		return ret;

 	sprintf(serial_string, "%08X%08X%08X", otp[0], otp[1], otp[2]);
 	env_set("serial#", serial_string);

 	return 0;
 }

 __weak void stm32mp_misc_init(void)
 {
 }

 int arch_misc_init(void)
 {
 	setup_boot_mode();
 	setup_mac_address();
 	setup_serial_number();
 	stm32mp_misc_init();

 	return 0;
 }

 /*
  * Without forcing the ".data" section, this would get saved in ".bss". BSS
  * will be cleared soon after, so it's not suitable.
  */
 static uintptr_t rom_api_table __section(".data");
 static uintptr_t nt_fw_dtb __section(".data");

 /*
  * The ROM gives us the API location in r0 when starting. This is only available
  * during SPL, as there isn't (yet) a mechanism to pass this on to u-boot. Save
  * the FDT address provided by TF-A in r2 at boot time. This function is called
  * from start.S
  */
 void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2,
 		      unsigned long r3)
 {
 	if (IS_ENABLED(CONFIG_STM32_ECDSA_VERIFY))
 		rom_api_table = r0;

 	if (IS_ENABLED(CONFIG_TFABOOT))
 		nt_fw_dtb = r2;

 	save_boot_params_ret();
 }

 uintptr_t get_stm32mp_rom_api_table(void)
 {
 	return rom_api_table;
 }

 uintptr_t get_stm32mp_bl2_dtb(void)
 {
 	return nt_fw_dtb;
 }

 #ifdef CONFIG_SPL_BUILD
 void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
 {
 	typedef void __noreturn (*image_entry_stm32_t)(u32 romapi);
 	uintptr_t romapi = get_stm32mp_rom_api_table();

 	image_entry_stm32_t image_entry =
 		(image_entry_stm32_t)spl_image->entry_point;

 	printf("image entry point: 0x%lx\n", spl_image->entry_point);
 	image_entry(romapi);
 }
 #endif
	// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
	/*
	* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
	*/

	#define LOG_CATEGORY LOGC_ARCH

	#include <common.h>
	#include <clk.h>
	#include <cpu_func.h>
	#include <debug_uart.h>
	#include <env.h>
	#include <init.h>
	#include <log.h>
	#include <lmb.h>
	#include <misc.h>
	#include <net.h>
	#include <spl.h>
	#include <asm/io.h>
	#include <asm/arch/stm32.h>
	#include <asm/arch/sys_proto.h>
	#include <asm/global_data.h>
	#include <dm/device.h>
	#include <dm/uclass.h>
	#include <linux/bitops.h>
	#include <linux/printk.h>

	/*
	* early TLB into the .data section so that it not get cleared
	* with 16kB allignment (see TTBR0_BASE_ADDR_MASK)
	*/
	u8 early_tlb[PGTABLE_SIZE] __section(".data") __aligned(0x4000);

	struct lmb lmb;

	u32 get_bootmode(void)
	{
	/* read bootmode from TAMP backup register */
	return (readl(TAMP_BOOT_CONTEXT) & TAMP_BOOT_MODE_MASK) >>
	TAMP_BOOT_MODE_SHIFT;
	}

	/*
	* weak function overidde: set the DDR/SYSRAM executable before to enable the
	* MMU and configure DACR, for early early_enable_caches (SPL or pre-reloc)
	*/
	void dram_bank_mmu_setup(int bank)
	{
	struct bd_info *bd = gd->bd;
	int i;
	phys_addr_t start;
	phys_size_t size;
	bool use_lmb = false;
	enum dcache_option option;

	if (IS_ENABLED(CONFIG_SPL_BUILD)) {
	/* STM32_SYSRAM_BASE exist only when SPL is supported */
	#ifdef CONFIG_SPL
	start = ALIGN_DOWN(STM32_SYSRAM_BASE, MMU_SECTION_SIZE);
	size = ALIGN(STM32_SYSRAM_SIZE, MMU_SECTION_SIZE);
	#endif
	} else if (gd->flags & GD_FLG_RELOC) {
	/* bd->bi_dram is available only after relocation */
	start = bd->bi_dram[bank].start;
	size = bd->bi_dram[bank].size;
	use_lmb = true;
	} else {
	/* mark cacheable and executable the beggining of the DDR */
	start = STM32_DDR_BASE;
	size = CONFIG_DDR_CACHEABLE_SIZE;
	}

	for (i = start >> MMU_SECTION_SHIFT;
	i < (start >> MMU_SECTION_SHIFT) + (size >> MMU_SECTION_SHIFT);
	i++) {
	option = DCACHE_DEFAULT_OPTION;
	if (use_lmb && lmb_is_reserved_flags(&lmb, i << MMU_SECTION_SHIFT, LMB_NOMAP))
	option = 0; /* INVALID ENTRY in TLB */
	set_section_dcache(i, option);
	}
	}
	/*
	* initialize the MMU and activate cache in SPL or in U-Boot pre-reloc stage
	* MMU/TLB is updated in enable_caches() for U-Boot after relocation
	* or is deactivated in U-Boot entry function start.S::cpu_init_cp15
	*/
	static void early_enable_caches(void)
	{
	/* I-cache is already enabled in start.S: cpu_init_cp15 */

	if (CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
	return;

	if (!(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))) {
	gd->arch.tlb_size = PGTABLE_SIZE;
	gd->arch.tlb_addr = (unsigned long)&early_tlb;
	}

	/* enable MMU (default configuration) */
	dcache_enable();
	}

	/*
	* Early system init
	*/
	int arch_cpu_init(void)
	{
	early_enable_caches();

	/* early armv7 timer init: needed for polling */
	timer_init();

	return 0;
	}

	/* weak function for SOC specific initialization */
	__weak void stm32mp_cpu_init(void)
	{
	}

	int mach_cpu_init(void)
	{
	u32 boot_mode;

	stm32mp_cpu_init();

	boot_mode = get_bootmode();

	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) &&
	(boot_mode & TAMP_BOOT_DEVICE_MASK) == BOOT_SERIAL_UART)
	gd->flags \|= GD_FLG_SILENT \| GD_FLG_DISABLE_CONSOLE;
	else if (IS_ENABLED(CONFIG_DEBUG_UART) && IS_ENABLED(CONFIG_SPL_BUILD))
	debug_uart_init();

	return 0;
	}

	void enable_caches(void)
	{
	/* parse device tree when data cache is still activated */
	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);

	/* I-cache is already enabled in start.S: icache_enable() not needed */

	/* deactivate the data cache, early enabled in arch_cpu_init() */
	dcache_disable();
	/*
	* update MMU after relocation and enable the data cache
	* warning: the TLB location udpated in board_f.c::reserve_mmu
	*/
	dcache_enable();
	}

	/* used when CONFIG_DISPLAY_CPUINFO is activated */
	int print_cpuinfo(void)
	{
	char name[SOC_NAME_SIZE];

	get_soc_name(name);
	printf("CPU: %s\n", name);

	return 0;
	}

	static void setup_boot_mode(void)
	{
	const u32 serial_addr[] = {
	STM32_USART1_BASE,
	STM32_USART2_BASE,
	STM32_USART3_BASE,
	STM32_UART4_BASE,
	STM32_UART5_BASE,
	STM32_USART6_BASE,
	STM32_UART7_BASE,
	STM32_UART8_BASE
	};
	const u32 sdmmc_addr[] = {
	STM32_SDMMC1_BASE,
	STM32_SDMMC2_BASE,
	STM32_SDMMC3_BASE
	};
	char cmd[60];
	u32 boot_ctx = readl(TAMP_BOOT_CONTEXT);
	u32 boot_mode =
	(boot_ctx & TAMP_BOOT_MODE_MASK) >> TAMP_BOOT_MODE_SHIFT;
	unsigned int instance = (boot_mode & TAMP_BOOT_INSTANCE_MASK) - 1;
	u32 forced_mode = (boot_ctx & TAMP_BOOT_FORCED_MASK);
	struct udevice *dev;

	log_debug("%s: boot_ctx=0x%x => boot_mode=%x, instance=%d forced=%x\n",
	__func__, boot_ctx, boot_mode, instance, forced_mode);
	switch (boot_mode & TAMP_BOOT_DEVICE_MASK) {
	case BOOT_SERIAL_UART:
	if (instance >= ARRAY_SIZE(serial_addr))
	break;
	/* serial : search associated node in devicetree */
	sprintf(cmd, "serial@%x", serial_addr[instance]);
	if (uclass_get_device_by_name(UCLASS_SERIAL, cmd, &dev)) {
	/* restore console on error */
	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL))
	gd->flags &= ~(GD_FLG_SILENT \|
	GD_FLG_DISABLE_CONSOLE);
	log_err("uart%d = %s not found in device tree!\n",
	instance + 1, cmd);
	break;
	}
	sprintf(cmd, "%d", dev_seq(dev));
	env_set("boot_device", "serial");
	env_set("boot_instance", cmd);

	/* restore console on uart when not used */
	if (IS_ENABLED(CONFIG_CMD_STM32PROG_SERIAL) && gd->cur_serial_dev != dev) {
	gd->flags &= ~(GD_FLG_SILENT \|
	GD_FLG_DISABLE_CONSOLE);
	log_info("serial boot with console enabled!\n");
	}
	break;
	case BOOT_SERIAL_USB:
	env_set("boot_device", "usb");
	env_set("boot_instance", "0");
	break;
	case BOOT_FLASH_SD:
	case BOOT_FLASH_EMMC:
	if (instance >= ARRAY_SIZE(sdmmc_addr))
	break;
	/* search associated sdmmc node in devicetree */
	sprintf(cmd, "mmc@%x", sdmmc_addr[instance]);
	if (uclass_get_device_by_name(UCLASS_MMC, cmd, &dev)) {
	printf("mmc%d = %s not found in device tree!\n",
	instance, cmd);
	break;
	}
	sprintf(cmd, "%d", dev_seq(dev));
	env_set("boot_device", "mmc");
	env_set("boot_instance", cmd);
	break;
	case BOOT_FLASH_NAND:
	env_set("boot_device", "nand");
	env_set("boot_instance", "0");
	break;
	case BOOT_FLASH_SPINAND:
	env_set("boot_device", "spi-nand");
	env_set("boot_instance", "0");
	break;
	case BOOT_FLASH_NOR:
	env_set("boot_device", "nor");
	env_set("boot_instance", "0");
	break;
	default:
	env_set("boot_device", "invalid");
	env_set("boot_instance", "");
	log_err("unexpected boot mode = %x\n", boot_mode);
	break;
	}

	switch (forced_mode) {
	case BOOT_FASTBOOT:
	log_info("Enter fastboot!\n");
	env_set("preboot", "env set preboot; fastboot 0");
	break;
	case BOOT_STM32PROG:
	env_set("boot_device", "usb");
	env_set("boot_instance", "0");
	break;
	case BOOT_UMS_MMC0:
	case BOOT_UMS_MMC1:
	case BOOT_UMS_MMC2:
	log_info("Enter UMS!\n");
	instance = forced_mode - BOOT_UMS_MMC0;
	sprintf(cmd, "env set preboot; ums 0 mmc %d", instance);
	env_set("preboot", cmd);
	break;
	case BOOT_RECOVERY:
	env_set("preboot", "env set preboot; run altbootcmd");
	break;
	case BOOT_NORMAL:
	break;
	default:
	log_debug("unexpected forced boot mode = %x\n", forced_mode);
	break;
	}

	/* clear TAMP for next reboot */
	clrsetbits_le32(TAMP_BOOT_CONTEXT, TAMP_BOOT_FORCED_MASK, BOOT_NORMAL);
	}

	/*
	* If there is no MAC address in the environment, then it will be initialized
	* (silently) from the value in the OTP.
	*/
	__weak int setup_mac_address(void)
	{
	int ret;
	int i;
	u32 otp[3];
	uchar enetaddr[6];
	struct udevice *dev;
	int nb_eth, nb_otp, index;

	if (!IS_ENABLED(CONFIG_NET))
	return 0;

	nb_eth = get_eth_nb();

	/* 6 bytes for each MAC addr and 4 bytes for each OTP */
	nb_otp = DIV_ROUND_UP(6 * nb_eth, 4);

	ret = uclass_get_device_by_driver(UCLASS_MISC,
	DM_DRIVER_GET(stm32mp_bsec),
	&dev);
	if (ret)
	return ret;

	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_MAC), otp, 4 * nb_otp);
	if (ret < 0)
	return ret;

	for (index = 0; index < nb_eth; index++) {
	/* MAC already in environment */
	if (eth_env_get_enetaddr_by_index("eth", index, enetaddr))
	continue;

	for (i = 0; i < 6; i++)
	enetaddr[i] = ((uint8_t )&otp)[i + 6 index];

	if (!is_valid_ethaddr(enetaddr)) {
	log_err("invalid MAC address %d in OTP %pM\n",
	index, enetaddr);
	return -EINVAL;
	}
	log_debug("OTP MAC address %d = %pM\n", index, enetaddr);
	ret = eth_env_set_enetaddr_by_index("eth", index, enetaddr);
	if (ret) {
	log_err("Failed to set mac address %pM from OTP: %d\n",
	enetaddr, ret);
	return ret;
	}
	}

	return 0;
	}

	static int setup_serial_number(void)
	{
	char serial_string[25];
	u32 otp[3] = {0, 0, 0 };
	struct udevice *dev;
	int ret;

	if (env_get("serial#"))
	return 0;

	ret = uclass_get_device_by_driver(UCLASS_MISC,
	DM_DRIVER_GET(stm32mp_bsec),
	&dev);
	if (ret)
	return ret;

	ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_SERIAL),
	otp, sizeof(otp));
	if (ret < 0)
	return ret;

	sprintf(serial_string, "%08X%08X%08X", otp[0], otp[1], otp[2]);
	env_set("serial#", serial_string);

	return 0;
	}

	__weak void stm32mp_misc_init(void)
	{
	}

	int arch_misc_init(void)
	{
	setup_boot_mode();
	setup_mac_address();
	setup_serial_number();
	stm32mp_misc_init();

	return 0;
	}

	/*
	* Without forcing the ".data" section, this would get saved in ".bss". BSS
	* will be cleared soon after, so it's not suitable.
	*/
	static uintptr_t rom_api_table __section(".data");
	static uintptr_t nt_fw_dtb __section(".data");

	/*
	* The ROM gives us the API location in r0 when starting. This is only available
	* during SPL, as there isn't (yet) a mechanism to pass this on to u-boot. Save
	* the FDT address provided by TF-A in r2 at boot time. This function is called
	* from start.S
	*/
	void save_boot_params(unsigned long r0, unsigned long r1, unsigned long r2,
	unsigned long r3)
	{
	if (IS_ENABLED(CONFIG_STM32_ECDSA_VERIFY))
	rom_api_table = r0;

	if (IS_ENABLED(CONFIG_TFABOOT))
	nt_fw_dtb = r2;

	save_boot_params_ret();
	}

	uintptr_t get_stm32mp_rom_api_table(void)
	{
	return rom_api_table;
	}

	uintptr_t get_stm32mp_bl2_dtb(void)
	{
	return nt_fw_dtb;
	}

	#ifdef CONFIG_SPL_BUILD
	void __noreturn jump_to_image_no_args(struct spl_image_info *spl_image)
	{
	typedef void __noreturn (*image_entry_stm32_t)(u32 romapi);
	uintptr_t romapi = get_stm32mp_rom_api_table();

	image_entry_stm32_t image_entry =
	(image_entry_stm32_t)spl_image->entry_point;

	printf("image entry point: 0x%lx\n", spl_image->entry_point);
	image_entry(romapi);
	}
	#endif