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MKUBOOTIMAGE(1) FreeBSD General Commands Manual MKUBOOTIMAGE(1) NAME mkubootimage - create U-Boot loader image SYNOPSIS mkubootimage [-hu] -A (arm|arm64|i386|mips|mips64|or1k|powerpc|sh) -a address [-C (bz2|gz|lzma|lzo|none)] [-E address] [-e address] [-f (arm64|uimg)] [-m magic] -n image [-O (freebsd|linux|netbsd|openbsd)] -T (fs|kernel|kernel_noload|ramdisk|script|standalone) 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|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 image Defines the image name. This is required. -O (freebsd|linux|netbsd|openbsd) Defines the operating system type. The default OS name is "netbsd". -t epoch Use given epoch timestamp as image creation time. (This is only used for legacy U-Boot images.) -T (fs|kernel|kernel_noload|ramdisk|script|standalone) Defines the image type. This is required for "uimg" format 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: magic: 0x27051956 time: Tue Jun 7 15:58:41 2011 size: 2482203 load addr: 0x00020000 entry point: 0x00020000 data crc: 0x700fdf53 os: 2 (netbsd) arch: 7 (powerpc) type: 2 (kernel) comp: 1 (gz) name: NetBSD/evbppc 5.99.52 (INSTALL_PMPPC) header crc: 0x94ea96cf 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. FreeBSD 14.1-RELEASE-p8 February 7, 2024 FreeBSD 14.1-RELEASE-p8