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MKUBOOTIMAGE(1)             General Commands Manual            MKUBOOTIMAGE(1)

NAME
     mkubootimage - create U-Boot loader image

SYNOPSIS
     mkubootimage [-hu] -A (arm|arm64|i386|mips|mips64|or1k|powerpc|riscv|sh)
                  -a address [-C (bz2|gz|lzma|lzo|none)] [-E address]
                  [-e address] [-f (arm64|uimg)] [-m magic] -n name
                  [-O (freebsd|linux|netbsd|openbsd)]
                  -T (fs|kernel|kernel_noload|ramdisk|script|standalone)
                  [-t epoch] source destination

DESCRIPTION
     The mkubootimage utility is used to create an image for Das U-Boot, the
     "Universal Boot Loader".

     The arguments are as follows:

     -A (arm|arm64|i386|mips|mips64|or1k|powerpc|riscv|sh)
                 Defines the architecture.  This is required for `uimg' format
                 images.

     -a address  Sets the image load address.  This is an integer between 0
                 and UINT32_MAX.  This is required for all `uimg' image types
                 except for script, ramdisk, and kernel_noload.

     -C (bz2|gz|lzma|lzo|none)
                 Defines the compression.  The default is `none'.

     -E address  Define the entry point.  This is an integer between 0 and
                 UINT32_MAX.  This option is the same as -e but it inverts the
                 bytes to convert the 32 bit integer from little to big endian
                 (or vice versa).  If -E or -e are not set, the entry point
                 defaults to the image load address (-a).

     -e address  Define the entry point.  This is an integer between 0 and
                 UINT32_MAX.  If -E or -e are not set, the entry point
                 defaults to the image load address (-a).

     -f (arm64|uimg)
                 Defines the output image format type.  The default is `uimg'.

     -h          Display the usage and exit.

     -m magic    Set the magic used for `uimg' format images.  This is an
                 integer between 0 and UINT32_MAX.  The default is
                 `0x27051956'.

     -n name     Defines the image name.  This is required.

     -O (freebsd|linux|netbsd|openbsd)
                 Defines the operating system type.  The default OS name is
                 `netbsd'.

     -T (fs|kernel|kernel_noload|ramdisk|script|standalone)
                 Defines the image type.  This is required for `uimg' format
                 images.

     -t epoch    Use given epoch timestamp as image creation time.  (This is
                 only used for legacy U-Boot images.)

     -u          Update the header in an existing file instead of creating a
                 new one.

     The required source argument is the filename of the kernel that is read.
     The required destination argument is the filename of the image file that
     is created.

EXIT STATUS
     mkubootimage returns 1 on failure to read the kernel, generate a header,
     or create the image.

EXAMPLES
     Before the image is written, the header is displayed to standard out; for
     example:

            image type:  uimg
            magic:       0x27051956
            time:        Tue May 21 18:05:09 2024
            size:        137
            load addr:   0x00000000
            entry point: 0x00000000
            data crc:    0xface05f2
            os:          2 (netbsd)
            arch:        2 (arm)
            type:        6 (script)
            comp:        0 (none)
            name:        NetBSD/armv7 boot
            header crc:  0x2164b567

SEE ALSO
     Das U-Boot - the Universal Boot Loader, http://www.denx.de/wiki/U-Boot/.

HISTORY
     The mkubootimage command first appeared in NetBSD 6.0.

AUTHORS
     The mkubootimage utility was originally written by Jared McNeill.  This
     manual page was written by Jeremy C. Reed.

NetBSD 11.99                     May 21, 2024                     NetBSD 11.99