board/esd/common/auto_update.c - platform/external/u-boot - Gitiles

 /*
  * (C) Copyright 2003-2004
  * Gary Jennejohn, DENX Software Engineering, gj@denx.de.
  * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
  *
  * 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>

 #if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
 #warning CFG_NAND_LEGACY not defined in a file using the legacy NAND support!
 #endif

 #include <command.h>
 #include <image.h>
 #include <asm/byteorder.h>
 #include <linux/mtd/nand_legacy.h>
 #include <fat.h>

 #include "auto_update.h"

 #ifdef CONFIG_AUTO_UPDATE

 #if !(CONFIG_COMMANDS & CFG_CMD_FAT)
 #error "must define CFG_CMD_FAT"
 #endif

 extern au_image_t au_image[];
 extern int N_AU_IMAGES;

 #define AU_DEBUG
 #undef AU_DEBUG

 #undef debug
 #ifdef	AU_DEBUG
 #define debug(fmt,args...)	printf (fmt ,##args)
 #else
 #define debug(fmt,args...)
 #endif	/* AU_DEBUG */


 #define LOAD_ADDR ((unsigned char *)0x100000)   /* where to load files into memory */
 #define MAX_LOADSZ 0x1e00000

 /* externals */
 extern int fat_register_device(block_dev_desc_t *, int);
 extern int file_fat_detectfs(void);
 extern long file_fat_read(const char *, void *, unsigned long);
 long do_fat_read (const char *filename, void *buffer, unsigned long maxsize, int dols);
 #ifdef CONFIG_VFD
 extern int trab_vfd (ulong);
 extern int transfer_pic(unsigned char, unsigned char *, int, int);
 #endif
 extern int flash_sect_erase(ulong, ulong);
 extern int flash_sect_protect (int, ulong, ulong);
 extern int flash_write (char *, ulong, ulong);
 /* change char* to void* to shutup the compiler */
 extern block_dev_desc_t *get_dev (char*, int);

 #if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
 /* references to names in cmd_nand.c */
 #define NANDRW_READ	0x01
 #define NANDRW_WRITE	0x00
 #define NANDRW_JFFS2	0x02
 #define NANDRW_JFFS2_SKIP	0x04
 extern struct nand_chip nand_dev_desc[];
 extern int nand_legacy_rw(struct nand_chip* nand, int cmd, size_t start, size_t len,
 		   size_t * retlen, u_char * buf);
 extern int nand_legacy_erase(struct nand_chip* nand, size_t ofs, size_t len, int clean);
 #endif /* (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY) */

 extern block_dev_desc_t ide_dev_desc[CFG_IDE_MAXDEVICE];


 int au_check_cksum_valid(int i, long nbytes)
 {
 	image_header_t *hdr;
 	unsigned long checksum;

 	hdr = (image_header_t *)LOAD_ADDR;

 	if ((au_image[i].type == AU_FIRMWARE) && (au_image[i].size != ntohl(hdr->ih_size))) {
 		printf ("Image %s has wrong size\n", au_image[i].name);
 		return -1;
 	}

 	if (nbytes != (sizeof(*hdr) + ntohl(hdr->ih_size))) {
 		printf ("Image %s bad total SIZE\n", au_image[i].name);
 		return -1;
 	}
 	/* check the data CRC */
 	checksum = ntohl(hdr->ih_dcrc);

 	if (crc32 (0, (uchar *)(LOAD_ADDR + sizeof(*hdr)), ntohl(hdr->ih_size))
 		!= checksum) {
 		printf ("Image %s bad data checksum\n", au_image[i].name);
 		return -1;
 	}
 	return 0;
 }


 int au_check_header_valid(int i, long nbytes)
 {
 	image_header_t *hdr;
 	unsigned long checksum;

 	hdr = (image_header_t *)LOAD_ADDR;
 	/* check the easy ones first */
 #undef CHECK_VALID_DEBUG
 #ifdef CHECK_VALID_DEBUG
 	printf("magic %#x %#x ", ntohl(hdr->ih_magic), IH_MAGIC);
 	printf("arch %#x %#x ", hdr->ih_arch, IH_CPU_PPC);
 	printf("size %#x %#lx ", ntohl(hdr->ih_size), nbytes);
 	printf("type %#x %#x ", hdr->ih_type, IH_TYPE_KERNEL);
 #endif
 	if (nbytes < sizeof(*hdr))
 	{
 		printf ("Image %s bad header SIZE\n", au_image[i].name);
 		return -1;
 	}
 	if (ntohl(hdr->ih_magic) != IH_MAGIC || hdr->ih_arch != IH_CPU_PPC)
 	{
 		printf ("Image %s bad MAGIC or ARCH\n", au_image[i].name);
 		return -1;
 	}
 	/* check the hdr CRC */
 	checksum = ntohl(hdr->ih_hcrc);
 	hdr->ih_hcrc = 0;

 	if (crc32 (0, (uchar *)hdr, sizeof(*hdr)) != checksum) {
 		printf ("Image %s bad header checksum\n", au_image[i].name);
 		return -1;
 	}
 	hdr->ih_hcrc = htonl(checksum);

 	/* check the type - could do this all in one gigantic if() */
 	if ((au_image[i].type == AU_FIRMWARE) && (hdr->ih_type != IH_TYPE_FIRMWARE)) {
 		printf ("Image %s wrong type\n", au_image[i].name);
 		return -1;
 	}
 	if ((au_image[i].type == AU_SCRIPT) && (hdr->ih_type != IH_TYPE_SCRIPT)) {
 		printf ("Image %s wrong type\n", au_image[i].name);
 		return -1;
 	}

 	/* recycle checksum */
 	checksum = ntohl(hdr->ih_size);

 #if 0 /* test-only */
 	/* for kernel and app the image header must also fit into flash */
 	if (idx != IDX_DISK)
 		checksum += sizeof(*hdr);
 	/* check the size does not exceed space in flash. HUSH scripts */
 	/* all have ausize[] set to 0 */
 	if ((ausize[idx] != 0) && (ausize[idx] < checksum)) {
 		printf ("Image %s is bigger than FLASH\n", au_image[i].name);
 		return -1;
 	}
 #endif

 	return 0;
 }


 int au_do_update(int i, long sz)
 {
 	image_header_t *hdr;
 	char *addr;
 	long start, end;
 	int off, rc;
 	uint nbytes;
 	int k;
 #if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
 	int total;
 #endif

 	hdr = (image_header_t *)LOAD_ADDR;

 	switch (au_image[i].type) {
 	case AU_SCRIPT:
 		printf("Executing script %s\n", au_image[i].name);

 		/* execute a script */
 		if (hdr->ih_type == IH_TYPE_SCRIPT) {
 			addr = (char *)((char *)hdr + sizeof(*hdr));
 			/* stick a NULL at the end of the script, otherwise */
 			/* parse_string_outer() runs off the end. */
 			addr[ntohl(hdr->ih_size)] = 0;
 			addr += 8;

 			/*
 			 * Replace cr/lf with ;
 			 */
 			k = 0;
 			while (addr[k] != 0) {
 				if ((addr[k] == 10) || (addr[k] == 13)) {
 					addr[k] = ';';
 				}
 				k++;
 			}

 			run_command(addr, 0);
 			return 0;
 		}

 		break;

 	case AU_FIRMWARE:
 	case AU_NOR:
 	case AU_NAND:
 		start = au_image[i].start;
 		end = au_image[i].start + au_image[i].size - 1;

 		/*
 		 * do not update firmware when image is already in flash.
 		 */
 		if (au_image[i].type == AU_FIRMWARE) {
 			char *orig = (char*)start;
 			char *new  = (char *)((char *)hdr + sizeof(*hdr));
 			nbytes = ntohl(hdr->ih_size);

 			while(--nbytes) {
 				if (*orig++ != *new++) {
 					break;
 				}
 			}
 			if (!nbytes) {
 				printf("Skipping firmware update - images are identical\n");
 				break;
 			}
 		}

 		/* unprotect the address range */
 		/* this assumes that ONLY the firmware is protected! */
 		if (au_image[i].type == AU_FIRMWARE) {
 			flash_sect_protect(0, start, end);
 		}

 		/*
 		 * erase the address range.
 		 */
 		if (au_image[i].type != AU_NAND) {
 			printf("Updating NOR FLASH with image %s\n", au_image[i].name);
 			debug ("flash_sect_erase(%lx, %lx);\n", start, end);
 			flash_sect_erase(start, end);
 		} else {
 #if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
 			printf("Updating NAND FLASH with image %s\n", au_image[i].name);
 			debug ("nand_legacy_erase(%lx, %lx);\n", start, end);
 			rc = nand_legacy_erase (nand_dev_desc, start, end - start + 1, 0);
 			debug ("nand_legacy_erase returned %x\n", rc);
 #endif
 		}

 		udelay(10000);

 		/* strip the header - except for the kernel and ramdisk */
 		if (au_image[i].type != AU_FIRMWARE) {
 			addr = (char *)hdr;
 			off = sizeof(*hdr);
 			nbytes = sizeof(*hdr) + ntohl(hdr->ih_size);
 		} else {
 			addr = (char *)((char *)hdr + sizeof(*hdr));
 			off = 0;
 			nbytes = ntohl(hdr->ih_size);
 		}

 		/*
 		 * copy the data from RAM to FLASH
 		 */
 		if (au_image[i].type != AU_NAND) {
 			debug ("flash_write(%p, %lx %x)\n", addr, start, nbytes);
 			rc = flash_write((char *)addr, start, nbytes);
 		} else {
 #if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
 			debug ("nand_legacy_rw(%p, %lx %x)\n", addr, start, nbytes);
 			rc = nand_legacy_rw(nand_dev_desc, NANDRW_WRITE | NANDRW_JFFS2,
 				     start, nbytes, (size_t *)&total, (uchar *)addr);
 			debug ("nand_legacy_rw: ret=%x total=%d nbytes=%d\n", rc, total, nbytes);
 #endif
 		}
 		if (rc != 0) {
 			printf("Flashing failed due to error %d\n", rc);
 			return -1;
 		}

 		/*
 		 * check the dcrc of the copy
 		 */
 		if (au_image[i].type != AU_NAND) {
 			rc = crc32 (0, (uchar *)(start + off), ntohl(hdr->ih_size));
 		} else {
 #if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
 			rc = nand_legacy_rw(nand_dev_desc, NANDRW_READ | NANDRW_JFFS2 | NANDRW_JFFS2_SKIP,
 				     start, nbytes, (size_t *)&total, (uchar *)addr);
 			rc = crc32 (0, (uchar *)(addr + off), ntohl(hdr->ih_size));
 #endif
 		}
 		if (rc != ntohl(hdr->ih_dcrc)) {
 			printf ("Image %s Bad Data Checksum After COPY\n", au_image[i].name);
 			return -1;
 		}

 		/* protect the address range */
 		/* this assumes that ONLY the firmware is protected! */
 		if (au_image[i].type == AU_FIRMWARE) {
 			flash_sect_protect(1, start, end);
 		}

 		break;

 	default:
 		printf("Wrong image type selected!\n");
 	}

 	return 0;
 }


 static void process_macros (const char *input, char *output)
 {
 	char c, prev;
 	const char *varname_start = NULL;
 	int inputcnt  = strlen (input);
 	int outputcnt = CFG_CBSIZE;
 	int state = 0;	/* 0 = waiting for '$'	*/
 			/* 1 = waiting for '(' or '{' */
 			/* 2 = waiting for ')' or '}' */
 			/* 3 = waiting for '''  */
 #ifdef DEBUG_PARSER
 	char *output_start = output;

 	printf ("[PROCESS_MACROS] INPUT len %d: \"%s\"\n", strlen(input), input);
 #endif

 	prev = '\0';			/* previous character	*/

 	while (inputcnt && outputcnt) {
 	    c = *input++;
 	    inputcnt--;

 	    if (state!=3) {
 	    /* remove one level of escape characters */
 	    if ((c == '\\') && (prev != '\\')) {
 		if (inputcnt-- == 0)
 			break;
 		prev = c;
 		c = *input++;
 	    }
 	    }

 	    switch (state) {
 	    case 0:			/* Waiting for (unescaped) $	*/
 		if ((c == '\'') && (prev != '\\')) {
 			state = 3;
 			break;
 		}
 		if ((c == '$') && (prev != '\\')) {
 			state++;
 		} else {
 			*(output++) = c;
 			outputcnt--;
 		}
 		break;
 	    case 1:			/* Waiting for (	*/
 		if (c == '(' || c == '{') {
 			state++;
 			varname_start = input;
 		} else {
 			state = 0;
 			*(output++) = '$';
 			outputcnt--;

 			if (outputcnt) {
 				*(output++) = c;
 				outputcnt--;
 			}
 		}
 		break;
 	    case 2:			/* Waiting for )	*/
 		if (c == ')' || c == '}') {
 			int i;
 			char envname[CFG_CBSIZE], *envval;
 			int envcnt = input-varname_start-1; /* Varname # of chars */

 			/* Get the varname */
 			for (i = 0; i < envcnt; i++) {
 				envname[i] = varname_start[i];
 			}
 			envname[i] = 0;

 			/* Get its value */
 			envval = getenv (envname);

 			/* Copy into the line if it exists */
 			if (envval != NULL)
 				while ((*envval) && outputcnt) {
 					*(output++) = *(envval++);
 					outputcnt--;
 				}
 			/* Look for another '$' */
 			state = 0;
 		}
 		break;
 	    case 3:			/* Waiting for '	*/
 		if ((c == '\'') && (prev != '\\')) {
 			state = 0;
 		} else {
 			*(output++) = c;
 			outputcnt--;
 		}
 		break;
 	    }
 	    prev = c;
 	}

 	if (outputcnt)
 		*output = 0;

 #ifdef DEBUG_PARSER
 	printf ("[PROCESS_MACROS] OUTPUT len %d: \"%s\"\n",
 		strlen(output_start), output_start);
 #endif
 }


 /*
  * this is called from board_init() after the hardware has been set up
  * and is usable. That seems like a good time to do this.
  * Right now the return value is ignored.
  */
 int do_auto_update(void)
 {
 	block_dev_desc_t *stor_dev;
 	long sz;
 	int i, res, cnt, old_ctrlc, got_ctrlc;
 	char buffer[32];
 	char str[80];

 	/*
 	 * Check whether a CompactFlash is inserted
 	 */
 	if (ide_dev_desc[0].type == DEV_TYPE_UNKNOWN) {
 		return -1;       /* no disk detected! */
 	}

 	/* check whether it has a partition table */
 	stor_dev = get_dev("ide", 0);
 	if (stor_dev == NULL) {
 		debug ("Uknown device type\n");
 		return -1;
 	}
 	if (fat_register_device(stor_dev, 1) != 0) {
 		debug ("Unable to register ide disk 0:1 for fatls\n");
 		return -1;
 	}

 	/*
 	 * Check if magic file is present
 	 */
 	if (do_fat_read(AU_MAGIC_FILE, buffer, sizeof(buffer), LS_NO) <= 0) {
 		return -1;
 	}

 #ifdef CONFIG_AUTO_UPDATE_SHOW
 	board_auto_update_show(1);
 #endif
 	puts("\nAutoUpdate Disk detected! Trying to update system...\n");

 	/* make sure that we see CTRL-C and save the old state */
 	old_ctrlc = disable_ctrlc(0);

 	/* just loop thru all the possible files */
 	for (i = 0; i < N_AU_IMAGES; i++) {
 		/*
 		 * Try to expand the environment var in the fname
 		 */
 		process_macros(au_image[i].name, str);
 		strcpy(au_image[i].name, str);

 		printf("Reading %s ...", au_image[i].name);
 		/* just read the header */
 		sz = do_fat_read(au_image[i].name, LOAD_ADDR, sizeof(image_header_t), LS_NO);
 		debug ("read %s sz %ld hdr %d\n",
 			au_image[i].name, sz, sizeof(image_header_t));
 		if (sz <= 0 || sz < sizeof(image_header_t)) {
 			puts(" not found\n");
 			continue;
 		}
 		if (au_check_header_valid(i, sz) < 0) {
 			puts(" header not valid\n");
 			continue;
 		}
 		sz = do_fat_read(au_image[i].name, LOAD_ADDR, MAX_LOADSZ, LS_NO);
 		debug ("read %s sz %ld hdr %d\n",
 			au_image[i].name, sz, sizeof(image_header_t));
 		if (sz <= 0 || sz <= sizeof(image_header_t)) {
 			puts(" not found\n");
 			continue;
 		}
 		if (au_check_cksum_valid(i, sz) < 0) {
 			puts(" checksum not valid\n");
 			continue;
 		}
 		puts(" done\n");

 		do {
 			res = au_do_update(i, sz);
 			/* let the user break out of the loop */
 			if (ctrlc() || had_ctrlc()) {
 				clear_ctrlc();
 				if (res < 0)
 					got_ctrlc = 1;
 				break;
 			}
 			cnt++;
 		} while (res < 0);
 	}

 	/* restore the old state */
 	disable_ctrlc(old_ctrlc);

 	puts("AutoUpdate finished\n\n");
 #ifdef CONFIG_AUTO_UPDATE_SHOW
 	board_auto_update_show(0);
 #endif

 	return 0;
 }


 int auto_update(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
 	do_auto_update();

 	return 0;
 }
 U_BOOT_CMD(
 	autoupd,	1,	1,	auto_update,
 	"autoupd - Automatically update images\n",
 	NULL
 );
 #endif /* CONFIG_AUTO_UPDATE */
	/*
	* (C) Copyright 2003-2004
	* Gary Jennejohn, DENX Software Engineering, gj@denx.de.
	* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.com
	*
	* 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>

	#if (CONFIG_COMMANDS & CFG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
	#warning CFG_NAND_LEGACY not defined in a file using the legacy NAND support!
	#endif

	#include <command.h>
	#include <image.h>
	#include <asm/byteorder.h>
	#include <linux/mtd/nand_legacy.h>
	#include <fat.h>

	#include "auto_update.h"

	#ifdef CONFIG_AUTO_UPDATE

	#if !(CONFIG_COMMANDS & CFG_CMD_FAT)
	#error "must define CFG_CMD_FAT"
	#endif

	extern au_image_t au_image[];
	extern int N_AU_IMAGES;

	#define AU_DEBUG
	#undef AU_DEBUG

	#undef debug
	#ifdef AU_DEBUG
	#define debug(fmt,args...) printf (fmt ,##args)
	#else
	#define debug(fmt,args...)
	#endif /* AU_DEBUG */


	#define LOAD_ADDR ((unsigned char )0x100000) / where to load files into memory */
	#define MAX_LOADSZ 0x1e00000

	/* externals */
	extern int fat_register_device(block_dev_desc_t *, int);
	extern int file_fat_detectfs(void);
	extern long file_fat_read(const char , void , unsigned long);
	long do_fat_read (const char filename, void buffer, unsigned long maxsize, int dols);
	#ifdef CONFIG_VFD
	extern int trab_vfd (ulong);
	extern int transfer_pic(unsigned char, unsigned char *, int, int);
	#endif
	extern int flash_sect_erase(ulong, ulong);
	extern int flash_sect_protect (int, ulong, ulong);
	extern int flash_write (char *, ulong, ulong);
	/* change char* to void* to shutup the compiler */
	extern block_dev_desc_t get_dev (char, int);

	#if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
	/* references to names in cmd_nand.c */
	#define NANDRW_READ 0x01
	#define NANDRW_WRITE 0x00
	#define NANDRW_JFFS2 0x02
	#define NANDRW_JFFS2_SKIP 0x04
	extern struct nand_chip nand_dev_desc[];
	extern int nand_legacy_rw(struct nand_chip* nand, int cmd, size_t start, size_t len,
	size_t * retlen, u_char * buf);
	extern int nand_legacy_erase(struct nand_chip* nand, size_t ofs, size_t len, int clean);
	#endif /* (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY) */

	extern block_dev_desc_t ide_dev_desc[CFG_IDE_MAXDEVICE];


	int au_check_cksum_valid(int i, long nbytes)
	{
	image_header_t *hdr;
	unsigned long checksum;

	hdr = (image_header_t *)LOAD_ADDR;

	if ((au_image[i].type == AU_FIRMWARE) && (au_image[i].size != ntohl(hdr->ih_size))) {
	printf ("Image %s has wrong size\n", au_image[i].name);
	return -1;
	}

	if (nbytes != (sizeof(*hdr) + ntohl(hdr->ih_size))) {
	printf ("Image %s bad total SIZE\n", au_image[i].name);
	return -1;
	}
	/* check the data CRC */
	checksum = ntohl(hdr->ih_dcrc);

	if (crc32 (0, (uchar )(LOAD_ADDR + sizeof(hdr)), ntohl(hdr->ih_size))
	!= checksum) {
	printf ("Image %s bad data checksum\n", au_image[i].name);
	return -1;
	}
	return 0;
	}


	int au_check_header_valid(int i, long nbytes)
	{
	image_header_t *hdr;
	unsigned long checksum;

	hdr = (image_header_t *)LOAD_ADDR;
	/* check the easy ones first */
	#undef CHECK_VALID_DEBUG
	#ifdef CHECK_VALID_DEBUG
	printf("magic %#x %#x ", ntohl(hdr->ih_magic), IH_MAGIC);
	printf("arch %#x %#x ", hdr->ih_arch, IH_CPU_PPC);
	printf("size %#x %#lx ", ntohl(hdr->ih_size), nbytes);
	printf("type %#x %#x ", hdr->ih_type, IH_TYPE_KERNEL);
	#endif
	if (nbytes < sizeof(*hdr))
	{
	printf ("Image %s bad header SIZE\n", au_image[i].name);
	return -1;
	}
	if (ntohl(hdr->ih_magic) != IH_MAGIC \|\| hdr->ih_arch != IH_CPU_PPC)
	{
	printf ("Image %s bad MAGIC or ARCH\n", au_image[i].name);
	return -1;
	}
	/* check the hdr CRC */
	checksum = ntohl(hdr->ih_hcrc);
	hdr->ih_hcrc = 0;

	if (crc32 (0, (uchar )hdr, sizeof(hdr)) != checksum) {
	printf ("Image %s bad header checksum\n", au_image[i].name);
	return -1;
	}
	hdr->ih_hcrc = htonl(checksum);

	/* check the type - could do this all in one gigantic if() */
	if ((au_image[i].type == AU_FIRMWARE) && (hdr->ih_type != IH_TYPE_FIRMWARE)) {
	printf ("Image %s wrong type\n", au_image[i].name);
	return -1;
	}
	if ((au_image[i].type == AU_SCRIPT) && (hdr->ih_type != IH_TYPE_SCRIPT)) {
	printf ("Image %s wrong type\n", au_image[i].name);
	return -1;
	}

	/* recycle checksum */
	checksum = ntohl(hdr->ih_size);

	#if 0 /* test-only */
	/* for kernel and app the image header must also fit into flash */
	if (idx != IDX_DISK)
	checksum += sizeof(*hdr);
	/* check the size does not exceed space in flash. HUSH scripts */
	/* all have ausize[] set to 0 */
	if ((ausize[idx] != 0) && (ausize[idx] < checksum)) {
	printf ("Image %s is bigger than FLASH\n", au_image[i].name);
	return -1;
	}
	#endif

	return 0;
	}


	int au_do_update(int i, long sz)
	{
	image_header_t *hdr;
	char *addr;
	long start, end;
	int off, rc;
	uint nbytes;
	int k;
	#if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
	int total;
	#endif

	hdr = (image_header_t *)LOAD_ADDR;

	switch (au_image[i].type) {
	case AU_SCRIPT:
	printf("Executing script %s\n", au_image[i].name);

	/* execute a script */
	if (hdr->ih_type == IH_TYPE_SCRIPT) {
	addr = (char )((char )hdr + sizeof(*hdr));
	/* stick a NULL at the end of the script, otherwise */
	/* parse_string_outer() runs off the end. */
	addr[ntohl(hdr->ih_size)] = 0;
	addr += 8;

	/*
	* Replace cr/lf with ;
	*/
	k = 0;
	while (addr[k] != 0) {
	if ((addr[k] == 10) \|\| (addr[k] == 13)) {
	addr[k] = ';';
	}
	k++;
	}

	run_command(addr, 0);
	return 0;
	}

	break;

	case AU_FIRMWARE:
	case AU_NOR:
	case AU_NAND:
	start = au_image[i].start;
	end = au_image[i].start + au_image[i].size - 1;

	/*
	* do not update firmware when image is already in flash.
	*/
	if (au_image[i].type == AU_FIRMWARE) {
	char orig = (char)start;
	char new = (char )((char )hdr + sizeof(hdr));
	nbytes = ntohl(hdr->ih_size);

	while(--nbytes) {
	if (orig++ != new++) {
	break;
	}
	}
	if (!nbytes) {
	printf("Skipping firmware update - images are identical\n");
	break;
	}
	}

	/* unprotect the address range */
	/* this assumes that ONLY the firmware is protected! */
	if (au_image[i].type == AU_FIRMWARE) {
	flash_sect_protect(0, start, end);
	}

	/*
	* erase the address range.
	*/
	if (au_image[i].type != AU_NAND) {
	printf("Updating NOR FLASH with image %s\n", au_image[i].name);
	debug ("flash_sect_erase(%lx, %lx);\n", start, end);
	flash_sect_erase(start, end);
	} else {
	#if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
	printf("Updating NAND FLASH with image %s\n", au_image[i].name);
	debug ("nand_legacy_erase(%lx, %lx);\n", start, end);
	rc = nand_legacy_erase (nand_dev_desc, start, end - start + 1, 0);
	debug ("nand_legacy_erase returned %x\n", rc);
	#endif
	}

	udelay(10000);

	/* strip the header - except for the kernel and ramdisk */
	if (au_image[i].type != AU_FIRMWARE) {
	addr = (char *)hdr;
	off = sizeof(*hdr);
	nbytes = sizeof(*hdr) + ntohl(hdr->ih_size);
	} else {
	addr = (char )((char )hdr + sizeof(*hdr));
	off = 0;
	nbytes = ntohl(hdr->ih_size);
	}

	/*
	* copy the data from RAM to FLASH
	*/
	if (au_image[i].type != AU_NAND) {
	debug ("flash_write(%p, %lx %x)\n", addr, start, nbytes);
	rc = flash_write((char *)addr, start, nbytes);
	} else {
	#if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
	debug ("nand_legacy_rw(%p, %lx %x)\n", addr, start, nbytes);
	rc = nand_legacy_rw(nand_dev_desc, NANDRW_WRITE \| NANDRW_JFFS2,
	start, nbytes, (size_t )&total, (uchar )addr);
	debug ("nand_legacy_rw: ret=%x total=%d nbytes=%d\n", rc, total, nbytes);
	#endif
	}
	if (rc != 0) {
	printf("Flashing failed due to error %d\n", rc);
	return -1;
	}

	/*
	* check the dcrc of the copy
	*/
	if (au_image[i].type != AU_NAND) {
	rc = crc32 (0, (uchar *)(start + off), ntohl(hdr->ih_size));
	} else {
	#if (CONFIG_COMMANDS & CFG_CMD_NAND) && defined(CFG_NAND_LEGACY)
	rc = nand_legacy_rw(nand_dev_desc, NANDRW_READ \| NANDRW_JFFS2 \| NANDRW_JFFS2_SKIP,
	start, nbytes, (size_t )&total, (uchar )addr);
	rc = crc32 (0, (uchar *)(addr + off), ntohl(hdr->ih_size));
	#endif
	}
	if (rc != ntohl(hdr->ih_dcrc)) {
	printf ("Image %s Bad Data Checksum After COPY\n", au_image[i].name);
	return -1;
	}

	/* protect the address range */
	/* this assumes that ONLY the firmware is protected! */
	if (au_image[i].type == AU_FIRMWARE) {
	flash_sect_protect(1, start, end);
	}

	break;

	default:
	printf("Wrong image type selected!\n");
	}

	return 0;
	}


	static void process_macros (const char input, char output)
	{
	char c, prev;
	const char *varname_start = NULL;
	int inputcnt = strlen (input);
	int outputcnt = CFG_CBSIZE;
	int state = 0; /* 0 = waiting for '$' */
	/* 1 = waiting for '(' or '{' */
	/* 2 = waiting for ')' or '}' */
	/* 3 = waiting for ''' */
	#ifdef DEBUG_PARSER
	char *output_start = output;

	printf ("[PROCESS_MACROS] INPUT len %d: \"%s\"\n", strlen(input), input);
	#endif

	prev = '\0'; /* previous character */

	while (inputcnt && outputcnt) {
	c = *input++;
	inputcnt--;

	if (state!=3) {
	/* remove one level of escape characters */
	if ((c == '\\') && (prev != '\\')) {
	if (inputcnt-- == 0)
	break;
	prev = c;
	c = *input++;
	}
	}

	switch (state) {
	case 0: /* Waiting for (unescaped) $ */
	if ((c == '\'') && (prev != '\\')) {
	state = 3;
	break;
	}
	if ((c == '$') && (prev != '\\')) {
	state++;
	} else {
	*(output++) = c;
	outputcnt--;
	}
	break;
	case 1: /* Waiting for ( */
	if (c == '(' \|\| c == '{') {
	state++;
	varname_start = input;
	} else {
	state = 0;
	*(output++) = '$';
	outputcnt--;

	if (outputcnt) {
	*(output++) = c;
	outputcnt--;
	}
	}
	break;
	case 2: /* Waiting for ) */
	if (c == ')' \|\| c == '}') {
	int i;
	char envname[CFG_CBSIZE], *envval;
	int envcnt = input-varname_start-1; /* Varname # of chars */

	/* Get the varname */
	for (i = 0; i < envcnt; i++) {
	envname[i] = varname_start[i];
	}
	envname[i] = 0;

	/* Get its value */
	envval = getenv (envname);

	/* Copy into the line if it exists */
	if (envval != NULL)
	while ((*envval) && outputcnt) {
	(output++) = (envval++);
	outputcnt--;
	}
	/* Look for another '$' */
	state = 0;
	}
	break;
	case 3: /* Waiting for ' */
	if ((c == '\'') && (prev != '\\')) {
	state = 0;
	} else {
	*(output++) = c;
	outputcnt--;
	}
	break;
	}
	prev = c;
	}

	if (outputcnt)
	*output = 0;

	#ifdef DEBUG_PARSER
	printf ("[PROCESS_MACROS] OUTPUT len %d: \"%s\"\n",
	strlen(output_start), output_start);
	#endif
	}


	/*
	* this is called from board_init() after the hardware has been set up
	* and is usable. That seems like a good time to do this.
	* Right now the return value is ignored.
	*/
	int do_auto_update(void)
	{
	block_dev_desc_t *stor_dev;
	long sz;
	int i, res, cnt, old_ctrlc, got_ctrlc;
	char buffer[32];
	char str[80];

	/*
	* Check whether a CompactFlash is inserted
	*/
	if (ide_dev_desc[0].type == DEV_TYPE_UNKNOWN) {
	return -1; /* no disk detected! */
	}

	/* check whether it has a partition table */
	stor_dev = get_dev("ide", 0);
	if (stor_dev == NULL) {
	debug ("Uknown device type\n");
	return -1;
	}
	if (fat_register_device(stor_dev, 1) != 0) {
	debug ("Unable to register ide disk 0:1 for fatls\n");
	return -1;
	}

	/*
	* Check if magic file is present
	*/
	if (do_fat_read(AU_MAGIC_FILE, buffer, sizeof(buffer), LS_NO) <= 0) {
	return -1;
	}

	#ifdef CONFIG_AUTO_UPDATE_SHOW
	board_auto_update_show(1);
	#endif
	puts("\nAutoUpdate Disk detected! Trying to update system...\n");

	/* make sure that we see CTRL-C and save the old state */
	old_ctrlc = disable_ctrlc(0);

	/* just loop thru all the possible files */
	for (i = 0; i < N_AU_IMAGES; i++) {
	/*
	* Try to expand the environment var in the fname
	*/
	process_macros(au_image[i].name, str);
	strcpy(au_image[i].name, str);

	printf("Reading %s ...", au_image[i].name);
	/* just read the header */
	sz = do_fat_read(au_image[i].name, LOAD_ADDR, sizeof(image_header_t), LS_NO);
	debug ("read %s sz %ld hdr %d\n",
	au_image[i].name, sz, sizeof(image_header_t));
	if (sz <= 0 \|\| sz < sizeof(image_header_t)) {
	puts(" not found\n");
	continue;
	}
	if (au_check_header_valid(i, sz) < 0) {
	puts(" header not valid\n");
	continue;
	}
	sz = do_fat_read(au_image[i].name, LOAD_ADDR, MAX_LOADSZ, LS_NO);
	debug ("read %s sz %ld hdr %d\n",
	au_image[i].name, sz, sizeof(image_header_t));
	if (sz <= 0 \|\| sz <= sizeof(image_header_t)) {
	puts(" not found\n");
	continue;
	}
	if (au_check_cksum_valid(i, sz) < 0) {
	puts(" checksum not valid\n");
	continue;
	}
	puts(" done\n");

	do {
	res = au_do_update(i, sz);
	/* let the user break out of the loop */
	if (ctrlc() \|\| had_ctrlc()) {
	clear_ctrlc();
	if (res < 0)
	got_ctrlc = 1;
	break;
	}
	cnt++;
	} while (res < 0);
	}

	/* restore the old state */
	disable_ctrlc(old_ctrlc);

	puts("AutoUpdate finished\n\n");
	#ifdef CONFIG_AUTO_UPDATE_SHOW
	board_auto_update_show(0);
	#endif

	return 0;
	}


	int auto_update(cmd_tbl_t cmdtp, int flag, int argc, char argv[])
	{
	do_auto_update();

	return 0;
	}
	U_BOOT_CMD(
	autoupd, 1, 1, auto_update,
	"autoupd - Automatically update images\n",
	NULL
	);
	#endif /* CONFIG_AUTO_UPDATE */