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).