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11da3403e9
For nearly all commands in U-Boot the '?' variable is handled the same way with 0 meaning success, 1 meaning any failure. Explain this in the general rules section of the cmdline documentation (with a link to a counter example) and then remove the redundant wording from most commands. We retain a section about the return value in a number of places where we are doing something such as always returning a specific value or we have useful additional information to go along with the normal return codes. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
67 lines
1.7 KiB
ReStructuredText
67 lines
1.7 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+:
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.. index::
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single: ebtupdate (command)
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ebtupdate command
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=================
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Synopsis
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--------
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::
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ebtupdate [<bct> [<ebt>] [<size>]]
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Description
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-----------
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The "ebtupdate" command is used to self-update bootloader on Tegra 2 and Tegra 3
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production devices which were processed using re-cryption.
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The "ebtupdate" performs encryption of new bootloader and decryption, patching
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and re-encryption of BCT "in situ". After BCT and bootloader can be written in
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their respective places.
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bct
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address of BCT block pre-loaded into RAM.
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ebt
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address of the bootloader pre-loaded into RAM.
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size
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size of the pre-loaded bootloader.
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Example
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-------
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This is the boot log of a LG Optimus Vu:
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::
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=> mmc dev 0 1
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switch to partitions #1, OK
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mmc0(part 1) is current device
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=> mmc read $kernel_addr_r 0 $boot_block_size
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MMC read: dev # 0, block # 0, count 4096 ... 4096 blocks read: OK
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=> load mmc 0:1 $ramdisk_addr_r $bootloader_file
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684783 bytes read in 44 ms (14.8 MiB/s)
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=> size mmc 0:1 $bootloader_file
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=> ebtupdate $kernel_addr_r $ramdisk_addr_r $filesize
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=> mmc dev 0 1
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switch to partitions #1, OK
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mmc0(part 1) is current device
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=> mmc write $kernel_addr_r 0 $boot_block_size
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MMC write: dev # 0, block # 0, count 4096 ... 4096 blocks written: OK
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=> mmc dev 0 2
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switch to partitions #2, OK
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mmc0(part 2) is current device
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=> mmc write $ramdisk_addr_r 0 $boot_block_size
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MMC write: dev # 0, block # 0, count 4096 ... 4096 blocks written: OK
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Configuration
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-------------
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The ebtupdate command is only available if CONFIG_CMD_EBTUPDATE=y and
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only on Tegra 2 and Tegra 3 configurations.
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