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+README on how boot images are created for secure TI devices
+
+CONFIG_TI_SECURE_DEVICE:
+Secure TI devices require a boot image that is authenticated by ROM
+code to function. Without this, even JTAG remains locked and the
+device is essentially useless. In order to create a valid boot image for
+a secure device from TI, the initial public software image must be signed
+and combined with various headers, certificates, and other binary images.
+
+Information on the details on the complete boot image format can be obtained
+from Texas Instruments. The tools used to generate boot images for secure
+devices are part of a secure development package (SECDEV) that can be
+downloaded from:
+
+	http://www.ti.com/mysecuresoftware (login required)
+
+The secure development package is access controlled due to NDA and export
+control restrictions. Access must be requested and granted by TI before the
+package is viewable and downloadable. Contact TI, either online or by way
+of a local TI representative, to request access.
+
+When CONFIG_TI_SECURE_DEVICE is set, the U-Boot SPL build process requires
+the presence and use of these tools in order to create a viable boot image.
+The build process will look for the environment variable TI_SECURE_DEV_PKG,
+which should be the path of the installed SECDEV package. If the
+TI_SECURE_DEV_PKG variable is not defined or if it is defined but doesn't
+point to a valid SECDEV package, a warning is issued during the build to
+indicate that a final secure bootable image was not created.
+
+Within the SECDEV package exists an image creation script:
+
+${TI_SECURE_DEV_PKG}/scripts/create-boot-image.sh
+
+This is called as part of the SPL/u-boot build process. As the secure boot
+image formats and requirements differ between secure SOC from TI, the
+purpose of this script is to abstract these details as much as possible.
+
+The script is basically the only required interface to the TI SECDEV package
+for secure TI devices.
+
+Invoking the script for AM43xx Secure Devices
+=============================================
+
+create-boot-image.sh <IMAGE_FLAG> <INPUT_FILE> <OUTPUT_FILE> <SPL_LOAD_ADDR>
+
+<IMAGE_FLAG> is a value that specifies the type of the image to generate OR
+the action the image generation tool will take. Valid values are:
+	SPI_X-LOADER - Generates an image for SPI flash (byte swapped)
+	XIP_X-LOADER - Generates a single stage u-boot for NOR/QSPI XiP
+	ISSW - Generates an image for all other boot modes
+
+<INPUT_FILE> is the full path and filename of the public world boot loader
+binary file (depending on the boot media, this is usually either
+u-boot-spl.bin or u-boot.bin).
+
+<OUTPUT_FILE> is the full path and filename of the final secure image. The
+output binary images should be used in place of the standard non-secure
+binary images (see the platform-specific user's guides and releases notes
+for how the non-secure images are typically used)
+	u-boot-spl_HS_SPI_X-LOADER - byte swapped boot image for SPI flash
+	u-boot_HS_XIP_X-LOADER - boot image for NOR or QSPI flash
+	u-boot-spl_HS_ISSW - boot image for all other boot media
+
+<SPL_LOAD_ADDR> is the address at which SOC ROM should load the <INPUT_FILE>
+
+Invoking the script for DRA7xx/AM57xx Secure Devices
+====================================================
+
+create-boot-image.sh <IMAGE_TYPE> <INPUT_FILE> <OUTPUT_FILE>
+
+<IMAGE_TYPE> is a value that specifies the type of the image to generate OR
+the action the image generation tool will take. Valid values are:
+	X-LOADER - Generates an image for NOR or QSPI boot modes
+	MLO - Generates an image for SD/MMC/eMMC boot modes
+	ULO - Generates an image for USB/UART peripheral boot modes
+	Note: ULO is not yet used by the u-boot build process
+
+<INPUT_FILE> is the full path and filename of the public world boot loader
+binary file (for this platform, this is always u-boot-spl.bin).
+
+<OUTPUT_FILE> is the full path and filename of the final secure image. The
+output binary images should be used in place of the standard non-secure
+binary images (see the platform-specific user's guides and releases notes
+for how the non-secure images are typically used)
+	u-boot-spl_HS_MLO - boot image for SD/MMC/eMMC. This image is
+		copied to a file named MLO, which is the name that
+		the device ROM bootloader requires for loading from
+		the FAT partition of an SD card (same as on
+		non-secure devices)
+	u-boot-spl_HS_X-LOADER - boot image for all other flash memories
+		including QSPI and NOR flash