Making one binary image containing boot loader and linux

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LEARN ABOUT FREEBSD

kgzip

KGZIP(8)						    BSD System Manager's Manual 						  KGZIP(8)

NAME

     kgzip -- compress a kernel

SYNOPSIS

     kgzip [-cv] [-f format] [-l loader] [-o output] file

DESCRIPTION

     The kgzip utility compresses a kernel or some other bootable binary.  Operation is in two phases as follows:

     1.   A load image of the executable file is built which omits all but the 'text' and 'data' segments.  This image is compressed using gzip(1)
	  and output as data in relocatable object format.

     2.   The object file is linked with a special self-hosting loader, producing an executable suitable for booting with either the second- or
	  third-level bootstraps.

     Supported object formats are 32-bit ELF and a.out ZMAGIC.

     If the file operand has a '.o' suffix, input is assumed to be for the link phase, and the first phase is omitted.

     The options are:

     -c 	 Omit the link phase.

     -v 	 Display object file information.

     -f format	 Use format as the output format, where format is 'aout' or 'elf'.  The default format is ELF.

     -l loader	 Link loader as the loader.

     -o output	 Name the output file output.  The default is to use the input name with the suffix '.o' (for relocatables) or '.kgz' (for exe-
		 cutables).

NOTES

     Global variables equivalent to the following are defined in the output:

     struct kgz_hdr {
	 char	     ident[4];	     /* identification: "KGZ" */
	 uint32_t    dload;	     /* decoded image load address */
	 uint32_t    dsize;	     /* decoded image size */
	 uint32_t    isize;	     /* image size in memory */
	 uint32_t    entry;	     /* entry point */
	 uint32_t    nsize;	     /* encoded image size */
     } kgz;

     uint8_t kgz_ndata[];	     /* encoded data */

     The encoded data is simply gzip(1) output: a header (with no optional fields); compressed data; and 32-bit CRC and size values.

FILES

     /usr/lib/kgzldr.o	The default loader

EXIT STATUS

     The kgzip utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     gzip(1), ld(1), a.out(5), elf(5), boot(8), loader(8)

AUTHORS

     Robert Nordier <rnordier@FreeBSD.org>

BUGS

     As symbols are lost, the usefulness of this utility for compressing kernels is limited to situations where loader(8) cannot be used; other-
     wise the preferred method of compressing a kernel is simply to gzip(1) it.

BSD
								   July 19, 1999							       BSD

UNIX for Advanced & Expert Users