bootm.c

uboot详细解读可用启动引导LINUX2.6内核

/*
 * (C) Copyright 2007 Michal Simek
 * (C) Copyright 2004 Atmark Techno, Inc.
 *
 * Michal  SIMEK <[e-mail]>
 * Yasushi SHOJI <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <command.h>
#include <image.h>
#include <zlib.h>
#include <asm/byteorder.h>

DECLARE_GLOBAL_DATA_PTR;

extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);

void do_bootm_linux (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
		     bootm_headers_t *images)
{
	/* First parameter is mapped to $r5 for kernel boot args */
	void	(*theKernel) (char *);
	char	*commandline = getenv ("bootargs");
	ulong	ep = 0;

	/* find kernel entry point */
	if (images->legacy_hdr_valid) {
		ep = image_get_ep (&images->legacy_hdr_os_copy);
#if defined(CONFIG_FIT)
	} else if (images->fit_uname_os) {
		int ret = fit_image_get_entry (images->fit_hdr_os,
				images->fit_noffset_os, &ep);
		if (ret) {
			puts ("Can't get entry point property!\n");
			goto error;
		}
#endif
	} else {
		puts ("Could not find kernel entry point!\n");
		goto error;
	}
	theKernel = (void (*)(char *))ep;

	show_boot_progress (15);

#ifdef DEBUG
	printf ("## Transferring control to Linux (at address %08lx) ...\n",
		(ulong) theKernel);
#endif

	theKernel (commandline);
	/* does not return */
	return;

error:
	do_reset (cmdtp, flag, argc, argv);
	return;
}