Merge branch 'master' of https://source.denx.de/u-boot/custodians/u-boot-tegra
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+.. SPDX-License-Identifier: GPL-2.0+:
+
+ebtupdate command
+=================
+
+Synopsis
+--------
+
+::
+
+ ebtupdate [<bct> [<ebt>] [<size>]]
+
+Description
+-----------
+
+The "ebtupdate" command is used to self-update bootloader on Tegra 2 and Tegra 3
+production devices which were processed using re-cryption.
+
+The "ebtupdate" performs encryption of new bootloader and decryption, patching
+and re-encryption of BCT "in situ". After BCT and bootloader can be written in
+their respective places.
+
+bct
+ address of BCT block pre-loaded into RAM.
+
+ebt
+ address of the bootloader pre-loaded into RAM.
+
+size
+ size of the pre-loaded bootloader.
+
+Example
+-------
+
+This is the boot log of a LG Optimus Vu:
+
+::
+
+ => mmc dev 0 1
+ switch to partitions #1, OK
+ mmc0(part 1) is current device
+ => mmc read $kernel_addr_r 0 $boot_block_size
+ MMC read: dev # 0, block # 0, count 4096 ... 4096 blocks read: OK
+ => load mmc 0:1 $ramdisk_addr_r $bootloader_file
+ 684783 bytes read in 44 ms (14.8 MiB/s)
+ => size mmc 0:1 $bootloader_file
+ => ebtupdate $kernel_addr_r $ramdisk_addr_r $filesize
+ => mmc dev 0 1
+ switch to partitions #1, OK
+ mmc0(part 1) is current device
+ => mmc write $kernel_addr_r 0 $boot_block_size
+ MMC write: dev # 0, block # 0, count 4096 ... 4096 blocks written: OK
+ => mmc dev 0 2
+ switch to partitions #2, OK
+ mmc0(part 2) is current device
+ => mmc write $ramdisk_addr_r 0 $boot_block_size
+ MMC write: dev # 0, block # 0, count 4096 ... 4096 blocks written: OK
+
+Configuration
+-------------
+
+The ebtupdate command is only available if CONFIG_CMD_EBTUPDATE=y and
+only on Tegra 2 and Tegra 3 configurations.
+
+Return value
+------------
+
+The return value $? is set to 0 (true) if everything went successfully. If an
+error occurs, the return value $? is set to 1 (false).