arm64: mvebu: Add bubt command for flash image burn

Add support for mvebu bubt command for flash image
load, check and burn on boot device.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Stefan Roese <sr@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Neta Zur Hershkovits <neta@marvell.com>
Cc: Omri Itach <omrii@marvell.com>
Cc: Igal Liberman <igall@marvell.com>
Cc: Haim Boot <hayim@marvell.com>
Cc: Hanna Hawa <hannah@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>

3 files changed, 827 insertions, 0 deletions

diff --git a/cmd/mvebu/Kconfig b/cmd/mvebu/Kconfig
new file mode 100644
index 0000000000..ad10a572a3
--- /dev/null
+++ b/cmd/mvebu/Kconfig
@@ -0,0 +1,52 @@
+menu "MVEBU commands"
+depends on ARCH_MVEBU
+
+config CMD_MVEBU_BUBT
+	bool "bubt"
+	default n
+	help
+	  bubt - Burn a u-boot image to flash
+	  For details about bubt command please see the documentation
+	  in doc/mvebu/cmd/bubt.txt
+
+choice
+	prompt "Flash for image"
+	default MVEBU_SPI_BOOT
+
+config MVEBU_NAND_BOOT
+	bool "NAND flash boot"
+	depends on NAND_PXA3XX
+	help
+	  Enable boot from NAND flash.
+	  Allow usage of NAND flash as a target for "bubt" command
+	  For details about bubt command please see the documentation
+	  in doc/mvebu/cmd/bubt.txt
+
+config MVEBU_SPI_BOOT
+	bool "SPI flash boot"
+	depends on SPI_FLASH
+	help
+	  Enable boot from SPI flash.
+	  Allow usage of SPI flash as a target for "bubt" command
+	  For details about bubt command please see the documentation
+	  in doc/mvebu/cmd/bubt.txt
+
+config MVEBU_MMC_BOOT
+	bool "eMMC flash boot"
+	depends on MVEBU_MMC
+	help
+	  Enable boot from eMMC boot partition
+	  Allow usage of eMMC/SD device as a target for "bubt" command
+	  For details about bubt command please see the documentation
+	  in doc/mvebu/cmd/bubt.txt
+
+endchoice
+
+config MVEBU_UBOOT_DFLT_NAME
+	string "Default image name for bubt command"
+	default "flash-image.bin"
+	help
+	  This option should contain a default file name to be used with
+	  MVEBU "bubt" command if the source file name is omitted
+
+endmenu
diff --git a/cmd/mvebu/Makefile b/cmd/mvebu/Makefile
new file mode 100644
index 0000000000..03de53ecdd
--- /dev/null
+++ b/cmd/mvebu/Makefile
@@ -0,0 +1,8 @@
+#
+# Copyright (C) 2016 Marvell International Ltd.
+#
+# SPDX-License-Identifier:	GPL-2.0
+# https://spdx.org/licenses
+
+
+obj-$(CONFIG_CMD_MVEBU_BUBT) += bubt.o
diff --git a/cmd/mvebu/bubt.c b/cmd/mvebu/bubt.c
new file mode 100644
index 0000000000..1cbfcf0863
--- /dev/null
+++ b/cmd/mvebu/bubt.c
@@ -0,0 +1,767 @@
+/*
+ * Copyright (C) 2016 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ * https://spdx.org/licenses
+ */
+
+#include <config.h>
+#include <common.h>
+#include <command.h>
+#include <vsprintf.h>
+#include <errno.h>
+#include <dm.h>
+
+#include <spi_flash.h>
+#include <spi.h>
+#include <nand.h>
+#include <usb.h>
+#include <fs.h>
+#include <mmc.h>
+#include <u-boot/sha1.h>
+#include <u-boot/sha256.h>
+
+#ifndef CONFIG_SYS_MMC_ENV_DEV
+#define CONFIG_SYS_MMC_ENV_DEV	0
+#endif
+
+#if defined(CONFIG_ARMADA_8K)
+#define MAIN_HDR_MAGIC		0xB105B002
+
+struct mvebu_image_header {
+	u32	magic;			/*  0-3  */
+	u32	prolog_size;		/*  4-7  */
+	u32	prolog_checksum;	/*  8-11 */
+	u32	boot_image_size;	/* 12-15 */
+	u32	boot_image_checksum;	/* 16-19 */
+	u32	rsrvd0;			/* 20-23 */
+	u32	load_addr;		/* 24-27 */
+	u32	exec_addr;		/* 28-31 */
+	u8	uart_cfg;		/*  32   */
+	u8	baudrate;		/*  33   */
+	u8	ext_count;		/*  34   */
+	u8	aux_flags;		/*  35   */
+	u32	io_arg_0;		/* 36-39 */
+	u32	io_arg_1;		/* 40-43 */
+	u32	io_arg_2;		/* 43-47 */
+	u32	io_arg_3;		/* 48-51 */
+	u32	rsrvd1;			/* 52-55 */
+	u32	rsrvd2;			/* 56-59 */
+	u32	rsrvd3;			/* 60-63 */
+};
+#elif defined(CONFIG_ARMADA_3700)	/* A3700 */
+#define HASH_SUM_LEN		16
+#define IMAGE_VERSION_3_6_0	0x030600
+#define IMAGE_VERSION_3_5_0	0x030500
+
+struct common_tim_data {
+	u32	version;
+	u32	identifier;
+	u32	trusted;
+	u32	issue_date;
+	u32	oem_unique_id;
+	u32	reserved[5];		/* Reserve 20 bytes */
+	u32	boot_flash_sign;
+	u32	num_images;
+	u32	num_keys;
+	u32	size_of_reserved;
+};
+
+struct mvebu_image_info {
+	u32	image_id;
+	u32	next_image_id;
+	u32	flash_entry_addr;
+	u32	load_addr;
+	u32	image_size;
+	u32	image_size_to_hash;
+	u32	hash_algorithm_id;
+	u32	hash[HASH_SUM_LEN];	/* Reserve 512 bits for the hash */
+	u32	partition_number;
+	u32	enc_algorithm_id;
+	u32	encrypt_start_offset;
+	u32	encrypt_size;
+};
+#endif /* CONFIG_ARMADA_XXX */
+
+struct bubt_dev {
+	char name[8];
+	size_t (*read)(const char *file_name);
+	int (*write)(size_t image_size);
+	int (*active)(void);
+};
+
+static ulong get_load_addr(void)
+{
+	const char *addr_str;
+	unsigned long addr;
+
+	addr_str = getenv("loadaddr");
+	if (addr_str)
+		addr = simple_strtoul(addr_str, NULL, 16);
+	else
+		addr = CONFIG_SYS_LOAD_ADDR;
+
+	return addr;
+}
+
+/********************************************************************
+ *     eMMC services
+ ********************************************************************/
+#ifdef CONFIG_DM_MMC
+static int mmc_burn_image(size_t image_size)
+{
+	struct mmc	*mmc;
+	lbaint_t	start_lba;
+	lbaint_t	blk_count;
+	ulong		blk_written;
+	int		err;
+	const u8	mmc_dev_num = CONFIG_SYS_MMC_ENV_DEV;
+
+	mmc = find_mmc_device(mmc_dev_num);
+	if (!mmc) {
+		printf("No SD/MMC/eMMC card found\n");
+		return -ENOMEDIUM;
+	}
+
+	err = mmc_init(mmc);
+	if (err) {
+		printf("%s(%d) init failed\n", IS_SD(mmc) ? "SD" : "MMC",
+		       mmc_dev_num);
+		return err;
+	}
+
+#ifdef CONFIG_SYS_MMC_ENV_PART
+	if (mmc->part_num != CONFIG_SYS_MMC_ENV_PART) {
+		err = mmc_switch_part(mmc_dev_num, CONFIG_SYS_MMC_ENV_PART);
+		if (err) {
+			printf("MMC partition switch failed\n");
+			return err;
+		}
+	}
+#endif
+
+	/* SD reserves LBA-0 for MBR and boots from LBA-1,
+	 * MMC/eMMC boots from LBA-0
+	 */
+	start_lba = IS_SD(mmc) ? 1 : 0;
+	blk_count = image_size / mmc->block_dev.blksz;
+	if (image_size % mmc->block_dev.blksz)
+		blk_count += 1;
+
+	blk_written = mmc->block_dev.block_write(mmc_dev_num,
+						start_lba, blk_count,
+						(void *)get_load_addr());
+	if (blk_written != blk_count) {
+		printf("Error - written %#lx blocks\n", blk_written);
+		return -ENOSPC;
+	}
+	printf("Done!\n");
+
+#ifdef CONFIG_SYS_MMC_ENV_PART
+	if (mmc->part_num != CONFIG_SYS_MMC_ENV_PART)
+		mmc_switch_part(mmc_dev_num, mmc->part_num);
+#endif
+
+	return 0;
+}
+
+static size_t mmc_read_file(const char *file_name)
+{
+	loff_t		act_read = 0;
+	int		rc;
+	struct mmc	*mmc;
+	const u8	mmc_dev_num = CONFIG_SYS_MMC_ENV_DEV;
+
+	mmc = find_mmc_device(mmc_dev_num);
+	if (!mmc) {
+		printf("No SD/MMC/eMMC card found\n");
+		return 0;
+	}
+
+	if (mmc_init(mmc)) {
+		printf("%s(%d) init failed\n", IS_SD(mmc) ? "SD" : "MMC",
+		       mmc_dev_num);
+		return 0;
+	}
+
+	/* Load from data partition (0) */
+	if (fs_set_blk_dev("mmc", "0", FS_TYPE_ANY)) {
+		printf("Error: MMC 0 not found\n");
+		return 0;
+	}
+
+	/* Perfrom file read */
+	rc = fs_read(file_name, get_load_addr(), 0, 0, &act_read);
+	if (rc)
+		return 0;
+
+	return act_read;
+}
+
+static int is_mmc_active(void)
+{
+	return 1;
+}
+#else /* CONFIG_DM_MMC */
+static int mmc_burn_image(size_t image_size)
+{
+	return -ENODEV;
+}
+
+static size_t mmc_read_file(const char *file_name)
+{
+	return 0;
+}
+
+static int is_mmc_active(void)
+{
+	return 0;
+}
+#endif /* CONFIG_DM_MMC */
+
+/********************************************************************
+ *     SPI services
+ ********************************************************************/
+#ifdef CONFIG_SPI_FLASH
+static int spi_burn_image(size_t image_size)
+{
+	int ret;
+	struct spi_flash *flash;
+	u32 erase_bytes;
+
+	/* Probe the SPI bus to get the flash device */
+	flash = spi_flash_probe(CONFIG_ENV_SPI_BUS,
+				CONFIG_ENV_SPI_CS,
+				CONFIG_SF_DEFAULT_SPEED,
+				CONFIG_SF_DEFAULT_MODE);
+	if (!flash) {
+		printf("Failed to probe SPI Flash\n");
+		return -ENOMEDIUM;
+	}
+
+#ifdef CONFIG_SPI_FLASH_PROTECTION
+	spi_flash_protect(flash, 0);
+#endif
+	erase_bytes = image_size +
+		(flash->erase_size - image_size % flash->erase_size);
+	printf("Erasing %d bytes (%d blocks) at offset 0 ...",
+	       erase_bytes, erase_bytes / flash->erase_size);
+	ret = spi_flash_erase(flash, 0, erase_bytes);
+	if (ret)
+		printf("Error!\n");
+	else
+		printf("Done!\n");
+
+	printf("Writing %d bytes from 0x%lx to offset 0 ...",
+	       (int)image_size, get_load_addr());
+	ret = spi_flash_write(flash, 0, image_size, (void *)get_load_addr());
+	if (ret)
+		printf("Error!\n");
+	else
+		printf("Done!\n");
+
+#ifdef CONFIG_SPI_FLASH_PROTECTION
+	spi_flash_protect(flash, 1);
+#endif
+
+	return ret;
+}
+
+static int is_spi_active(void)
+{
+	return 1;
+}
+
+#else /* CONFIG_SPI_FLASH */
+static int spi_burn_image(size_t image_size)
+{
+	return -ENODEV;
+}
+
+static int is_spi_active(void)
+{
+	return 0;
+}
+#endif /* CONFIG_SPI_FLASH */
+
+/********************************************************************
+ *     NAND services
+ ********************************************************************/
+#ifdef CONFIG_CMD_NAND
+static int nand_burn_image(size_t image_size)
+{
+	int ret, block_size;
+	nand_info_t *nand;
+	int dev = nand_curr_device;
+
+	if ((dev < 0) || (dev >= CONFIG_SYS_MAX_NAND_DEVICE) ||
+	    (!nand_info[dev].name)) {
+		puts("\nno devices available\n");
+		return -ENOMEDIUM;
+	}
+	nand = &nand_info[dev];
+	block_size = nand->erasesize;
+
+	/* Align U-Boot size to currently used blocksize */
+	image_size = ((image_size + (block_size - 1)) & (~(block_size - 1)));
+
+	/* Erase the U-BOOT image space */
+	printf("Erasing 0x%x - 0x%x:...", 0, (int)image_size);
+	ret = nand_erase(nand, 0, image_size);
+	if (ret) {
+		printf("Error!\n");
+		goto error;
+	}
+	printf("Done!\n");
+
+	/* Write the image to flash */
+	printf("Writing image:...");
+	printf("&image_size = 0x%p\n", (void *)&image_size);
+	ret = nand_write(nand, 0, &image_size, (void *)get_load_addr());
+	if (ret)
+		printf("Error!\n");
+	else
+		printf("Done!\n");
+
+error:
+	return ret;
+}
+
+static int is_nand_active(void)
+{
+	return 1;
+}
+
+#else /* CONFIG_CMD_NAND */
+static int nand_burn_image(size_t image_size)
+{
+	return -ENODEV;
+}
+
+static int is_nand_active(void)
+{
+	return 0;
+}
+#endif /* CONFIG_CMD_NAND */
+
+/********************************************************************
+ *     USB services
+ ********************************************************************/
+#if defined(CONFIG_USB_STORAGE) && defined(CONFIG_BLK)
+static size_t usb_read_file(const char *file_name)
+{
+	loff_t act_read = 0;
+	struct udevice *dev;
+	int rc;
+
+	usb_stop();
+
+	if (usb_init() < 0) {
+		printf("Error: usb_init failed\n");
+		return 0;
+	}
+
+	/* Try to recognize storage devices immediately */
+	blk_first_device(IF_TYPE_USB, &dev);
+	if (!dev) {
+		printf("Error: USB storage device not found\n");
+		return 0;
+	}
+
+	/* Always load from usb 0 */
+	if (fs_set_blk_dev("usb", "0", FS_TYPE_ANY)) {
+		printf("Error: USB 0 not found\n");
+		return 0;
+	}
+
+	/* Perfrom file read */
+	rc = fs_read(file_name, get_load_addr(), 0, 0, &act_read);
+	if (rc)
+		return 0;
+
+	return act_read;
+}
+
+static int is_usb_active(void)
+{
+	return 1;
+}
+
+#else /* defined(CONFIG_USB_STORAGE) && defined (CONFIG_BLK) */
+static size_t usb_read_file(const char *file_name)
+{
+	return 0;
+}
+
+static int is_usb_active(void)
+{
+	return 0;
+}
+#endif /* defined(CONFIG_USB_STORAGE) && defined (CONFIG_BLK) */
+
+/********************************************************************
+ *     Network services
+ ********************************************************************/
+#ifdef CONFIG_CMD_NET
+static size_t tftp_read_file(const char *file_name)
+{
+	/* update global variable load_addr before tftp file from network */
+	load_addr = get_load_addr();
+	return net_loop(TFTPGET);
+}
+
+static int is_tftp_active(void)
+{
+	return 1;
+}
+
+#else
+static size_t tftp_read_file(const char *file_name)
+{
+	return 0;
+}
+
+static int is_tftp_active(void)
+{
+	return 0;
+}
+#endif /* CONFIG_CMD_NET */
+
+enum bubt_devices {
+	BUBT_DEV_NET = 0,
+	BUBT_DEV_USB,
+	BUBT_DEV_MMC,
+	BUBT_DEV_SPI,
+	BUBT_DEV_NAND,
+
+	BUBT_MAX_DEV
+};
+
+struct bubt_dev bubt_devs[BUBT_MAX_DEV] = {
+	{"tftp", tftp_read_file, NULL, is_tftp_active},
+	{"usb",  usb_read_file,  NULL, is_usb_active},
+	{"mmc",  mmc_read_file,  mmc_burn_image, is_mmc_active},
+	{"spi",  NULL, spi_burn_image,  is_spi_active},
+	{"nand", NULL, nand_burn_image, is_nand_active},
+};
+
+static int bubt_write_file(struct bubt_dev *dst, size_t image_size)
+{
+	if (!dst->write) {
+		printf("Error: Write not supported on device %s\n", dst->name);
+		return -ENOTSUPP;
+	}
+
+	return dst->write(image_size);
+}
+
+#if defined(CONFIG_ARMADA_8K)
+u32 do_checksum32(u32 *start, int32_t len)
+{
+	u32 sum = 0;
+	u32 *startp = start;
+
+	do {
+		sum += *startp;
+		startp++;
+		len -= 4;
+	} while (len > 0);
+
+	return sum;
+}
+
+static int check_image_header(void)
+{
+	struct mvebu_image_header *hdr =
+			(struct mvebu_image_header *)get_load_addr();
+	u32 header_len = hdr->prolog_size;
+	u32 checksum;
+	u32 checksum_ref = hdr->prolog_checksum;
+
+	/*
+	 * For now compare checksum, and magic. Later we can
+	 * verify more stuff on the header like interface type, etc
+	 */
+	if (hdr->magic != MAIN_HDR_MAGIC) {
+		printf("ERROR: Bad MAGIC 0x%08x != 0x%08x\n",
+		       hdr->magic, MAIN_HDR_MAGIC);
+		return -ENOEXEC;
+	}
+
+	/* The checksum value is discarded from checksum calculation */
+	hdr->prolog_checksum = 0;
+
+	checksum = do_checksum32((u32 *)hdr, header_len);
+	if (checksum != checksum_ref) {
+		printf("Error: Bad Image checksum. 0x%x != 0x%x\n",
+		       checksum, checksum_ref);
+		return -ENOEXEC;
+	}
+
+	/* Restore the checksum before writing */
+	hdr->prolog_checksum = checksum_ref;
+	printf("Image checksum...OK!\n");
+
+	return 0;
+}
+#elif defined(CONFIG_ARMADA_3700) /* Armada 3700 */
+static int check_image_header(void)
+{
+	struct common_tim_data *hdr = (struct common_tim_data *)get_load_addr();
+	int image_num;
+	u8 hash_160_output[SHA1_SUM_LEN];
+	u8 hash_256_output[SHA256_SUM_LEN];
+	sha1_context hash1_text;
+	sha256_context hash256_text;
+	u8 *hash_output;
+	u32 hash_algorithm_id;
+	u32 image_size_to_hash;
+	u32 flash_entry_addr;
+	u32 *hash_value;
+	u32 internal_hash[HASH_SUM_LEN];
+	const u8 *buff;
+	u32 num_of_image = hdr->num_images;
+	u32 version = hdr->version;
+	u32 trusted = hdr->trusted;
+
+	/* bubt checksum validation only supports nontrusted images */
+	if (trusted == 1) {
+		printf("bypass image validation, ");
+		printf("only untrusted image is supported now\n");
+		return 0;
+	}
+	/* only supports image version 3.5 and 3.6 */
+	if (version != IMAGE_VERSION_3_5_0 && version != IMAGE_VERSION_3_6_0) {
+		printf("Error: Unsupported Image version = 0x%08x\n", version);
+		return -ENOEXEC;
+	}
+	/* validate images hash value */
+	for (image_num = 0; image_num < num_of_image; image_num++) {
+		struct mvebu_image_info *info =
+				(struct mvebu_image_info *)(get_load_addr() +
+				sizeof(struct common_tim_data) +
+				image_num * sizeof(struct mvebu_image_info));
+		hash_algorithm_id = info->hash_algorithm_id;
+		image_size_to_hash = info->image_size_to_hash;
+		flash_entry_addr = info->flash_entry_addr;
+		hash_value = info->hash;
+		buff = (const u8 *)(get_load_addr() + flash_entry_addr);
+
+		if (image_num == 0) {
+			/*
+			 * The first image includes hash values in its content.
+			 * For hash calculation, we need to save the original
+			 * hash values to a local variable that will be
+			 * copied back for comparsion and set all zeros to
+			 * the orignal hash values for calculating new value.
+			 * First image original format :
+			 * x...x (datum1) x...x(orig. hash values) x...x(datum2)
+			 * Replaced first image format :
+			 * x...x (datum1) 0...0(hash values) x...x(datum2)
+			 */
+			memcpy(internal_hash, hash_value,
+			       sizeof(internal_hash));
+			memset(hash_value, 0, sizeof(internal_hash));
+		}
+		if (image_size_to_hash == 0) {
+			printf("Warning: Image_%d hash checksum is disabled, ",
+			       image_num);
+			printf("skip the image validation.\n");
+			continue;
+		}
+		switch (hash_algorithm_id) {
+		case SHA1_SUM_LEN:
+			sha1_starts(&hash1_text);
+			sha1_update(&hash1_text, buff, image_size_to_hash);
+			sha1_finish(&hash1_text, hash_160_output);
+			hash_output = hash_160_output;
+			break;
+		case SHA256_SUM_LEN:
+			sha256_starts(&hash256_text);
+			sha256_update(&hash256_text, buff, image_size_to_hash);
+			sha256_finish(&hash256_text, hash_256_output);
+			hash_output = hash_256_output;
+			break;
+		default:
+			printf("Error: Unsupported hash_algorithm_id = %d\n",
+			       hash_algorithm_id);
+			return -ENOEXEC;
+		}
+		if (image_num == 0)
+			memcpy(hash_value, internal_hash,
+			       sizeof(internal_hash));
+		if (memcmp(hash_value, hash_output, hash_algorithm_id) != 0) {
+			printf("Error: Image_%d checksum is not correct\n",
+			       image_num);
+			return -ENOEXEC;
+		}
+	}
+	printf("Image checksum...OK!\n");
+
+	return 0;
+}
+
+#else /* Not ARMADA? */
+static int check_image_header(void)
+{
+	printf("bubt cmd does not support this SoC device or family!\n");
+	return -ENOEXEC;
+}
+#endif
+
+static int bubt_verify(size_t image_size)
+{
+	int err;
+
+	/* Check a correct image header exists */
+	err = check_image_header();
+	if (err) {
+		printf("Error: Image header verification failed\n");
+		return err;
+	}
+
+	return 0;
+}
+
+static int bubt_read_file(struct bubt_dev *src)
+{
+	size_t image_size;
+
+	if (!src->read) {
+		printf("Error: Read not supported on device \"%s\"\n",
+		       src->name);
+		return 0;
+	}
+
+	image_size = src->read(net_boot_file_name);
+	if (image_size <= 0) {
+		printf("Error: Failed to read file %s from %s\n",
+		       net_boot_file_name, src->name);
+		return 0;
+	}
+
+	return image_size;
+}
+
+static int bubt_is_dev_active(struct bubt_dev *dev)
+{
+	if (!dev->active) {
+		printf("Device \"%s\" not supported by U-BOOT image\n",
+		       dev->name);
+		return 0;
+	}
+
+	if (!dev->active()) {
+		printf("Device \"%s\" is inactive\n", dev->name);
+		return 0;
+	}
+
+	return 1;
+}
+
+struct bubt_dev *find_bubt_dev(char *dev_name)
+{
+	int dev;
+
+	for (dev = 0; dev < BUBT_MAX_DEV; dev++) {
+		if (strcmp(bubt_devs[dev].name, dev_name) == 0)
+			return &bubt_devs[dev];
+	}
+
+	return 0;
+}
+
+#define DEFAULT_BUBT_SRC "tftp"
+
+#ifndef DEFAULT_BUBT_DST
+#ifdef CONFIG_MVEBU_SPI_BOOT
+#define DEFAULT_BUBT_DST "spi"
+#elif defined(CONFIG_MVEBU_NAND_BOOT)
+#define DEFAULT_BUBT_DST "nand"
+#elif defined(CONFIG_MVEBU_MMC_BOOT)
+#define DEFAULT_BUBT_DST "mmc"
+else
+#define DEFAULT_BUBT_DST "error"
+#endif
+#endif /* DEFAULT_BUBT_DST */
+
+int do_bubt_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	struct bubt_dev *src, *dst;
+	size_t image_size;
+	char src_dev_name[8];
+	char dst_dev_name[8];
+	char *name;
+	int  err;
+
+	if (argc < 2)
+		copy_filename(net_boot_file_name,
+			      CONFIG_MVEBU_UBOOT_DFLT_NAME,
+			      sizeof(net_boot_file_name));
+	else
+		copy_filename(net_boot_file_name, argv[1],
+			      sizeof(net_boot_file_name));
+
+	if (argc >= 3) {
+		strncpy(dst_dev_name, argv[2], 8);
+	} else {
+		name = DEFAULT_BUBT_DST;
+		strncpy(dst_dev_name, name, 8);
+	}
+
+	if (argc >= 4)
+		strncpy(src_dev_name, argv[3], 8);
+	else
+		strncpy(src_dev_name, DEFAULT_BUBT_SRC, 8);
+
+	/* Figure out the destination device */
+	dst = find_bubt_dev(dst_dev_name);
+	if (!dst) {
+		printf("Error: Unknown destination \"%s\"\n", dst_dev_name);
+		return -EINVAL;
+	}
+
+	if (!bubt_is_dev_active(dst))
+		return -ENODEV;
+
+	/* Figure out the source device */
+	src = find_bubt_dev(src_dev_name);
+	if (!src) {
+		printf("Error: Unknown source \"%s\"\n", src_dev_name);
+		return 1;
+	}
+
+	if (!bubt_is_dev_active(src))
+		return -ENODEV;
+
+	printf("Burning U-BOOT image \"%s\" from \"%s\" to \"%s\"\n",
+	       net_boot_file_name, src->name, dst->name);
+
+	image_size = bubt_read_file(src);
+	if (!image_size)
+		return -EIO;
+
+	err = bubt_verify(image_size);
+	if (err)
+		return err;
+
+	err = bubt_write_file(dst, image_size);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	bubt, 4, 0, do_bubt_cmd,
+	"Burn a u-boot image to flash",
+	"[file-name] [destination [source]]\n"
+	"\t-file-name     The image file name to burn. Default = flash-image.bin\n"
+	"\t-destination   Flash to burn to [spi, nand, mmc]. Default = active boot device\n"
+	"\t-source        The source to load image from [tftp, usb, mmc]. Default = tftp\n"
+	"Examples:\n"
+	"\tbubt - Burn flash-image.bin from tftp to active boot device\n"
+	"\tbubt flash-image-new.bin nand - Burn flash-image-new.bin from tftp to NAND flash\n"
+	"\tbubt backup-flash-image.bin mmc usb - Burn backup-flash-image.bin from usb to MMC\n"
+
+);