cvs

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

n, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  
   This is access code for flashes using ARM's flash partitioning 
   standards.

   $Id: afs.c,v 1.6 2001/10/02 10:04:51 rmk Exp $

======================================================================*/

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

struct footer_struct {
	u32 image_info_base;	/* Address of first word of ImageFooter  */
	u32 image_start;	/* Start of area reserved by this footer */
	u32 signature;		/* 'Magic' number proves it's a footer   */
	u32 type;		/* Area type: ARM Image, SIB, customer   */
	u32 checksum;		/* Just this structure                   */
};

struct image_info_struct {
	u32 bootFlags;		/* Boot flags, compression etc.          */
	u32 imageNumber;	/* Unique number, selects for boot etc.  */
	u32 loadAddress;	/* Address program should be loaded to   */
	u32 length;		/* Actual size of image                  */
	u32 address;		/* Image is executed from here           */
	char name[16];		/* Null terminated                       */
	u32 headerBase;		/* Flash Address of any stripped header  */
	u32 header_length;	/* Length of header in memory            */
	u32 headerType;		/* AIF, RLF, s-record etc.               */
	u32 checksum;		/* Image checksum (inc. this struct)     */
};

static int
afs_read_footer(struct mtd_info *mtd, u_int *img_start, u_int *iis_start,
		u_int off, u_int mask)
{
	struct footer_struct fs;
	u_int ptr = off + mtd->erasesize - sizeof(fs);
	size_t sz;
	int ret;

	ret = mtd->read(mtd, ptr, sizeof(fs), &sz, (u_char *) &fs);
	if (ret >= 0 && sz != sizeof(fs))
		ret = -EINVAL;

	if (ret < 0) {
		printk(KE