| .. SPDX-License-Identifier: GPL-2.0+: | |
| .. index:: | |
| single: ebtupdate (command) | |
| 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. |