mirror of
https://github.com/AsahiLinux/u-boot
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87b0af9317
This adds support for signing images in auto-generated FITs. To do this, we need to add a signature node. The algorithm name property already has its own option, but we need one for the key name hint. We could have gone the -G route and added an explicit name for the public key (like what is done for the private key). However, many places assume the public key can be constructed from the key dir and hint, and I don't want to do the refactoring necessary. As a consequence of this, it is now easier to add public keys to an existing image without signing something. This could be done all along, but now you don't have to create an its just to do it. Ideally, we wouldn't create a FIT at the end. This could be done by calling fit_image_setup_sig/info.crypto->add_verify_data directly. Signed-off-by: Sean Anderson <sean.anderson@seco.com>
340 lines
9.6 KiB
Groff
340 lines
9.6 KiB
Groff
.TH MKIMAGE 1 "2022-02-07"
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.SH NAME
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mkimage \- Generate image for U-Boot
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.SH SYNOPSIS
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.B mkimage
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.RB [ \-T " \fItype\fP] " \-l " [\fIuimage file name\fP]"
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.B mkimage
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.RB [\fIoptions\fP] " \-f [" "image tree source file" "]" " [" "uimage file name" "]"
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.B mkimage
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.RB [\fIoptions\fP] " \-F [" "uimage file name" "]"
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.B mkimage
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.RB [\fIoptions\fP] " (legacy mode)"
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.SH "DESCRIPTION"
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The
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.B mkimage
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command is used to create images for use with the U-Boot boot loader.
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These images can contain the linux kernel, device tree blob, root file
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system image, firmware images etc., either separate or combined.
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.B mkimage
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supports two different formats:
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The old
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.I legacy image
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format concatenates the individual parts (for example, kernel image,
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device tree blob and ramdisk image) and adds a 64 bytes header
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containing information about target architecture, operating system,
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image type, compression method, entry points, time stamp, checksums,
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etc.
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The new
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.I FIT (Flattened Image Tree) format
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allows for more flexibility in handling images of various types and also
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enhances integrity protection of images with stronger checksums. It also
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supports verified boot.
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.SH "OPTIONS"
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.B List image information:
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.TP
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.BI "\-l [" "uimage file name" "]"
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mkimage lists the information contained in the header of an existing U-Boot image.
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.TP
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.BI "\-T [" "image type" "]"
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Parse image file as type.
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Pass \-h as the image to see the list of supported image type.
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Without this option image type is autodetected.
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.TP
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.BI "\-q"
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Quiet. Don't print the image header on successful verification.
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.P
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.B Create old legacy image:
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.TP
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.BI "\-A [" "architecture" "]"
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Set architecture. Pass \-h as the architecture to see the list of supported architectures.
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.TP
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.BI "\-O [" "os" "]"
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Set operating system. bootm command of u-boot changes boot method by os type.
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Pass \-h as the OS to see the list of supported OS.
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.TP
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.BI "\-T [" "image type" "]"
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Set image type.
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Pass \-h as the image to see the list of supported image type.
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.TP
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.BI "\-C [" "compression type" "]"
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Set compression type.
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Pass \-h as the compression to see the list of supported compression type.
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.TP
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.BI "\-a [" "load address" "]"
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Set load address with a hex number.
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.TP
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.BI "\-e [" "entry point" "]"
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Set entry point with a hex number.
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.TP
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.BI "\-l"
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List the contents of an image.
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.TP
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.BI "\-n [" "image name" "]"
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Set image name to 'image name'.
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.TP
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.BI "\-R [" "secondary image name" "]"
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Some image types support a second image for additional data. For these types,
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use \-R to specify this second image.
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.TS
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allbox;
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lb lbx
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l l.
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Image Type Secondary Image Description
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pblimage Additional RCW-style header, typically used for PBI commands.
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zynqimage, zynqmpimage T{
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Initialization parameters, one per line. Each parameter has the form
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.sp
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.ti 4
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.I address data
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.sp
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where
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.I address
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and
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.I data
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are hexadecimal integers. The boot ROM will write each
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.I data
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to
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.I address
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when loading the image. At most 256 parameters may be specified in this
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manner.
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T}
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.TE
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.TP
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.BI "\-d [" "image data file" "]"
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Use image data from 'image data file'.
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.TP
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.BI "\-x"
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Set XIP (execute in place) flag.
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.TP
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.BI "\-s"
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Don't copy in the image data. Depending on the image type, this may create
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just the header, everything but the image data, or nothing at all.
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.TP
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.BI "\-v"
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Verbose. Print file names as they are added to the image.
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.P
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.B Create FIT image:
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.TP
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.BI "\-b [" "device tree file" "]
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Appends the device tree binary file (.dtb) to the FIT.
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.TP
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.BI "\-c [" "comment" "]"
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Specifies a comment to be added when signing. This is typically a useful
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message which describes how the image was signed or some other useful
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information.
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.TP
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.BI "\-D [" "dtc options" "]"
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Provide special options to the device tree compiler that is used to
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create the image.
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.TP
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.BI "\-E
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After processing, move the image data outside the FIT and store a data offset
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in the FIT. Images will be placed one after the other immediately after the
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FIT, with each one aligned to a 4-byte boundary. The existing 'data' property
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in each image will be replaced with 'data-offset' and 'data-size' properties.
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A 'data-offset' of 0 indicates that it starts in the first (4-byte aligned)
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byte after the FIT.
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.TP
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.BI "\-B [" "alignment" "]"
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The alignment, in hexadecimal, that external data will be aligned to. This
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option only has an effect when \-E is specified.
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.TP
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.BI "\-f [" "image tree source file" " | " "auto" "]"
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Image tree source file that describes the structure and contents of the
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FIT image.
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This can be automatically generated for some simple cases.
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Use "-f auto" for this. In that case the arguments -d, -A, -O, -T, -C, -a
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and -e are used to specify the image to include in the FIT and its attributes.
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No .its file is required.
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.TP
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.BI "\-F"
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Indicates that an existing FIT image should be modified. No dtc
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compilation is performed and the \-f flag should not be given.
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This can be used to sign images with additional keys after initial image
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creation.
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.TP
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.BI "\-i [" "ramdisk_file" "]"
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Appends the ramdisk file to the FIT.
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.TP
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.BI "\-k [" "key_directory" "]"
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Specifies the directory containing keys to use for signing. This directory
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should contain a private key file <name>.key for use with signing and a
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certificate <name>.crt (containing the public key) for use with verification.
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.TP
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.BI "\-G [" "key_file" "]"
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Specifies the private key file to use when signing. This option may be used
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instead of \-k.
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.TP
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.BI "\-K [" "key_destination" "]"
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Specifies a compiled device tree binary file (typically .dtb) to write
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public key information into. When a private key is used to sign an image,
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the corresponding public key is written into this file for for run-time
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verification. Typically the file here is the device tree binary used by
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CONFIG_OF_CONTROL in U-Boot.
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.TP
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.BI "\-G [" "key_file" "]"
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Specifies the private key file to use when signing. This option may be used
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instead of \-k.
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.TP
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.BI "\-g [" "key_name_hint" "]"
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Sets the key-name-hint property when used with \-f auto. This is the <name>
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part of the key. The directory part is set by \-k. This option also indicates
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that the images included in the FIT should be signed. If this option is
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specified, \-o must be specified as well.
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.TP
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.BI "\-o [" "signing algorithm" "]"
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Specifies the algorithm to be used for signing a FIT image. The default is
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taken from the signature node's 'algo' property.
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.TP
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.BI "\-p [" "external position" "]"
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Place external data at a static external position. See \-E. Instead of writing
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a 'data-offset' property defining the offset from the end of the FIT, \-p will
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use 'data-position' as the absolute position from the base of the FIT.
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.TP
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.BI "\-r"
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Specifies that keys used to sign the FIT are required. This means that they
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must be verified for the image to boot. Without this option, the verification
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will be optional (useful for testing but not for release).
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.TP
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.BI "\-N [" "engine" "]"
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The openssl engine to use when signing and verifying the image. For a complete list of
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available engines, refer to
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.BR engine (1).
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.TP
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.BI "\-t
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Update the timestamp in the FIT.
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Normally the FIT timestamp is created the first time mkimage is run on a FIT,
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when converting the source .its to the binary .fit file. This corresponds to
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using the -f flag. But if the original input to mkimage is a binary file
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(already compiled) then the timestamp is assumed to have been set previously.
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.SH EXAMPLES
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List image information:
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.nf
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.B mkimage -l uImage
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.fi
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.P
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Create legacy image with compressed PowerPC Linux kernel:
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.nf
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.B mkimage -A powerpc -O linux -T kernel -C gzip \\\\
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.br
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.B -a 0 -e 0 -n Linux -d vmlinux.gz uImage
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.fi
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.P
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Create FIT image with compressed PowerPC Linux kernel:
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.nf
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.B mkimage -f kernel.its kernel.itb
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.fi
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.P
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Create FIT image with compressed kernel and sign it with keys in the
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/public/signing-keys directory. Add corresponding public keys into u-boot.dtb,
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skipping those for which keys cannot be found. Also add a comment.
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.nf
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.B mkimage -f kernel.its -k /public/signing-keys -K u-boot.dtb \\\\
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.br
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.B -c """Kernel 3.8 image for production devices""" kernel.itb
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.fi
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.P
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Add public keys to u-boot.dtb without needing a FIT to sign. This will also
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create a FIT containing an images node with no data named unused.itb.
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.nf
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.B mkimage -f auto -d /dev/null -k /public/signing-keys -g dev \\\\
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.br
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.B -o sha256,rsa2048 -K u-boot.dtb unused.itb
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.fi
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.P
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Update an existing FIT image, signing it with additional keys.
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Add corresponding public keys into u-boot.dtb. This will resign all images
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with keys that are available in the new directory. Images that request signing
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with unavailable keys are skipped.
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.nf
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.B mkimage -F -k /secret/signing-keys -K u-boot.dtb \\\\
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.br
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.B -c """Kernel 3.8 image for production devices""" kernel.itb
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.fi
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.P
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Create a FIT image containing a kernel, using automatic mode. No .its file
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is required.
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.nf
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.B mkimage -f auto -A arm -O linux -T kernel -C none -a 43e00000 -e 0 \\\\
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.br
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.B -c """Kernel 4.4 image for production devices""" -d vmlinuz kernel.itb
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.fi
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.P
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Create a FIT image containing a kernel and some device tree files, using
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automatic mode. No .its file is required.
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.nf
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.B mkimage -f auto -A arm -O linux -T kernel -C none -a 43e00000 -e 0 \\\\
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.br
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.B -c """Kernel 4.4 image for production devices""" -d vmlinuz \\\\
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.B -b /path/to/rk3288-firefly.dtb -b /path/to/rk3288-jerry.dtb kernel.itb
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.fi
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.P
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Create a FIT image containing a signed kernel, using automatic mode. No .its
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file is required.
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.nf
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.B mkimage -f auto -A arm -O linux -T kernel -C none -a 43e00000 -e 0 \\\\
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.br
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.B -d vmlinuz -k /secret/signing-keys -g dev -o sha256,rsa2048 kernel.itb
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.fi
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.SH HOMEPAGE
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http://www.denx.de/wiki/U-Boot/WebHome
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.PP
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.SH AUTHOR
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This manual page was written by Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
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and Wolfgang Denk <wd@denx.de>. It was updated for image signing by
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Simon Glass <sjg@chromium.org>.
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