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"Das U-Boot" Source Tree
1.. SPDX-License-Identifier: GPL-2.0+:
2
3.. index::
4 single: ebtupdate (command)
5
6ebtupdate command
7=================
8
9Synopsis
10--------
11
12::
13
14 ebtupdate [<bct> [<ebt>] [<size>]]
15
16Description
17-----------
18
19The "ebtupdate" command is used to self-update bootloader on Tegra 2 and Tegra 3
20production devices which were processed using re-cryption.
21
22The "ebtupdate" performs encryption of new bootloader and decryption, patching
23and re-encryption of BCT "in situ". After BCT and bootloader can be written in
24their respective places.
25
26bct
27 address of BCT block pre-loaded into RAM.
28
29ebt
30 address of the bootloader pre-loaded into RAM.
31
32size
33 size of the pre-loaded bootloader.
34
35Example
36-------
37
38This is the boot log of a LG Optimus Vu:
39
40::
41
42 => mmc dev 0 1
43 switch to partitions #1, OK
44 mmc0(part 1) is current device
45 => mmc read $kernel_addr_r 0 $boot_block_size
46 MMC read: dev # 0, block # 0, count 4096 ... 4096 blocks read: OK
47 => load mmc 0:1 $ramdisk_addr_r $bootloader_file
48 684783 bytes read in 44 ms (14.8 MiB/s)
49 => size mmc 0:1 $bootloader_file
50 => ebtupdate $kernel_addr_r $ramdisk_addr_r $filesize
51 => mmc dev 0 1
52 switch to partitions #1, OK
53 mmc0(part 1) is current device
54 => mmc write $kernel_addr_r 0 $boot_block_size
55 MMC write: dev # 0, block # 0, count 4096 ... 4096 blocks written: OK
56 => mmc dev 0 2
57 switch to partitions #2, OK
58 mmc0(part 2) is current device
59 => mmc write $ramdisk_addr_r 0 $boot_block_size
60 MMC write: dev # 0, block # 0, count 4096 ... 4096 blocks written: OK
61
62Configuration
63-------------
64
65The ebtupdate command is only available if CONFIG_CMD_EBTUPDATE=y and
66only on Tegra 2 and Tegra 3 configurations.
67
68Return value
69------------
70
71The return value $? is set to 0 (true) if everything went successfully. If an
72error occurs, the return value $? is set to 1 (false).