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try to fetch start and size of onboard physical memory from u-boot instead of
hardcoding it here

/*
 * $Id: bootinfo.c,v 1.2 2008/07/15 22:56:23 nbrk Exp $
 */
/*-
 * Copyright (c) 2005, Kohsuke Ohtani
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <boot.h>
#include <platform.h>
#include <uboot.h>

/*
 * Setup boot information.
 */
void
setup_bootinfo(struct boot_info **bpp)
{
	struct boot_info *bp;
	struct uboot_cframe *ucfp;

	bp = (struct boot_info *)BOOT_INFO;
	memset(bp, 0, BOOT_INFO_SIZE);

	bp->archive = (u_long)ARCHIVE_START;

	/* video? huh. */
	bp->video.text_x = 0;
	bp->video.text_y = 0;

	/*
	 * Try to ask first stage bootloader about physical memory.
	 */
	printk("setup_bootinfo: fetching boot_params @0x%x", BOOT_PARAMS);
	ucfp = uboot_map(BOOT_PARAMS);
	if (ucfp != NULL) {
		bp->main_mem.start = ucfp->ucf_memstart;
		bp->main_mem.size = ucfp->ucf_memsize;
	} else {
		/* use defaults */
		bp->main_mem.start = 0x10000000;
		bp->main_mem.size  = 0x02000000;	/* 32MB */
	}

	printk("setup_bootinfo: main memory start=%x size=%x (using %s values)\n",
	       (int)boot_info->main_mem.start,
	       (int)boot_info->main_mem.size,
			ucfp == NULL ? "default" : "u-boot");

	*bpp = bp;
}