flash.c

Uboot源码,非常通用的bootloader.适用于各种平台的Linux系统引导.

/*
 * (C) Copyright 2001
 * Stefan Roese, esd gmbh germany, [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 <asm/hardware.h>

/*
 * include common flash code (for esd boards)
 */
#include "../common/flash.c"

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (vu_long * addr, flash_info_t * info);
static void flash_get_offsets (ulong base, flash_info_t * info);

/*-----------------------------------------------------------------------
 */

unsigned long flash_init (void)
{
#ifdef __DEBUG_START_FROM_SRAM__
	return CFG_DUMMY_FLASH_SIZE;
#else
	unsigned long size_b0;
	int i;

	/* Init: no FLASHes known */
	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
		flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	/* Static FLASH Bank configuration here - FIXME XXX */

	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);

	if (flash_info[0].flash_id == FLASH_UNKNOWN) {
		printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
			size_b0, size_b0<<20);
	}

	/* Setup offsets */
	flash_get_offsets (0, &flash_info[0]);

	/* Monitor protection ON by default */
	(void)flash_protect(FLAG_PROTECT_SET,
			    -CFG_MONITOR_LEN,
			    0xffffffff,
			    &flash_info[0]);

	flash_info[0].size = size_b0;

	return (size_b0);
#endif
}