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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/usage/cmd/ebtupdate.rst | 69 | ||||
| -rw-r--r-- | doc/usage/index.rst | 1 |
2 files changed, 70 insertions, 0 deletions
diff --git a/doc/usage/cmd/ebtupdate.rst b/doc/usage/cmd/ebtupdate.rst new file mode 100644 index 00000000000..d90474ccec3 --- /dev/null +++ b/doc/usage/cmd/ebtupdate.rst @@ -0,0 +1,69 @@ +.. 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). diff --git a/doc/usage/index.rst b/doc/usage/index.rst index cde7dcb14a6..840c20c934d 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -41,6 +41,7 @@ Shell commands cmd/conitrace cmd/cyclic cmd/dm + cmd/ebtupdate cmd/echo cmd/eficonfig cmd/env |