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