BUBT (Burn ATF) command
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--------------------------
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Bubt command is used to burn a new ATF image to flash device.
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The bubt command gets the following parameters: ATF file name, destination device and source device.
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bubt [file-name] [destination [source]]
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- file-name Image file name to burn. default = flash-image.bin
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- destination Flash to burn to [spi, nand, mmc]. default = active flash
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- source Source to load image from [tftp, usb]. default = tftp
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Examples:
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bubt - Burn flash-image.bin from tftp to active flash
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bubt latest-spi.bin nand - Burn latest-spi.bin from tftp to NAND flash
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Notes:
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- For the TFTP interface set serverip and ipaddr.
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- To burn image to SD/eMMC device, the target is defined
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by parameters CONFIG_SYS_MMC_ENV_DEV and CONFIG_SYS_MMC_ENV_PART.
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Bubt command details (burn image step by-step)
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----------------------------------------------
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This section describes bubt command flow:
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1. Fetch the requested ATF image from an available interface (USB/SD/SATA/XDB, etc.)
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into the DRAM, and place it at <load_address>
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Example: when using the FAT file system on USB flash device:
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# usb reset
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# fatls usb 0 (see files in device)
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# fatload usb 0 <load_address> <file_name>
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2. Erase the target device:
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- NAND: # nand erase 0 100000
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- SPI: # sf probe 0
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# sf erase 0 100000
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- SD/eMMC: # mmc dev <dev_id> <boot_partition>
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Notes:
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- The eMMC has 2 boot partitions (BOOT0 and BOOT1) and a user data partition (DATA).
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The boot partitions are numbered as partition 1 and 2 in MMC driver.
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Number 0 is used for user data partition and should not be utilized for storing
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boot images and U-Boot environment in RAW mode since it will break file system
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structures usually located here.
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The default boot partition is BOOT0. It is selected by the following parameter:
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CONFIG_SYS_MMC_ENV_PART=1
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Valid values for this parameter are 1 for BOOT0 and 2 for BOOT1.
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Please never use partition number 0 here!
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The eMMC has 2 boot partitions (BOOT0 and BOOT1) and a user data partition (DATA).
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The boot partitions are numbered as partition 1 and 2 in MMC driver.
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Number 0 is used for user data partition and should not be utilized for storing
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boot images and U-Boot environment in RAW mode since it will break file system
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structures usually located here.
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The default boot partition is BOOT0. It is selected by the following parameter:
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CONFIG_SYS_MMC_ENV_PART=1
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Valid values for this parameter are 1 for BOOT0 and 2 for BOOT1.
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Please never use partition number 0 here!
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- The partition number is ignored if the target device is SD card.
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- The boot image offset starts at block 0 for eMMC and block 1 for SD devices.
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The block 0 on SD devices is left for MBR storage.
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3. Write the ATF image:
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- NAND: # nand write <load_address> 0 <ATF Size>
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- SPI: # sf write <load_address> 0 <ATF Size>
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- SD/eMMC: # mmc write <load_address> [0|1] <ATF Size>/<block_size>
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