board/fads/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2000
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <mpc8xx.h>

 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];	/* info for FLASH chips */

 #if defined(CONFIG_ENV_IS_IN_FLASH)
 # ifndef  CONFIG_ENV_ADDR
 #  define CONFIG_ENV_ADDR	(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 # endif
 # ifndef  CONFIG_ENV_SIZE
 #  define CONFIG_ENV_SIZE	CONFIG_ENV_SECT_SIZE
 # endif
 # ifndef  CONFIG_ENV_SECT_SIZE
 #  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
 # endif
 #endif

 #define QUAD_ID(id)	((((ulong)(id) & 0xFF) << 24) | \
 			 (((ulong)(id) & 0xFF) << 16) | \
 			 (((ulong)(id) & 0xFF) << 8)  | \
 			 (((ulong)(id) & 0xFF) << 0)    \
 			)

 /*-----------------------------------------------------------------------
  * Functions
  */
 static ulong flash_get_size (vu_long * addr, flash_info_t * info);
 static int write_word (flash_info_t * info, ulong dest, ulong data);

 /*-----------------------------------------------------------------------
  */
 unsigned long flash_init (void)
 {
 	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 	volatile memctl8xx_t *memctl = &immap->im_memctl;
 	vu_long *bcsr = (vu_long *)BCSR_ADDR;
 	unsigned long pd_size, total_size, bsize, or_am;
 	int i;

 	/* Init: no FLASHes known */
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 		flash_info[i].flash_id = FLASH_UNKNOWN;
 		flash_info[i].size = 0;
 		flash_info[i].sector_count = 0;
 		flash_info[i].start[0] = 0xFFFFFFFF; /* For TFTP */
 	}

 	switch ((bcsr[2] & BCSR2_FLASH_PD_MASK) >> BCSR2_FLASH_PD_SHIFT) {
 	case 2:
 	case 4:
 	case 6:
 		pd_size = 0x800000;
 		or_am = 0xFF800000;
 		break;

 	case 5:
 	case 7:
 		pd_size = 0x400000;
 		or_am = 0xFFC00000;
 		break;

 	case 8:
 		pd_size = 0x200000;
 		or_am = 0xFFE00000;
 		break;

 	default:
 		pd_size = 0;
 		or_am = 0xFFE00000;
 		printf("## Unsupported flash detected by BCSR: 0x%08lX\n", bcsr[2]);
 	}

 	total_size = 0;
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS && total_size < pd_size; ++i) {
 		bsize = flash_get_size((vu_long *)(CONFIG_SYS_FLASH_BASE + total_size),
 				       &flash_info[i]);

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

 		total_size += bsize;
 	}

 	if (total_size != pd_size) {
 		printf("## Detected flash size %lu conflicts with PD data %lu\n",
 		       total_size, pd_size);
 	}

 	/* Remap FLASH according to real size */
 	memctl->memc_or0 = or_am | CONFIG_SYS_OR_TIMING_FLASH;

 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS && flash_info[i].size != 0; ++i) {
 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
 		/* monitor protection ON by default */
 		if (CONFIG_SYS_MONITOR_BASE >= flash_info[i].start[0])
 			flash_protect (FLAG_PROTECT_SET,
 				       CONFIG_SYS_MONITOR_BASE,
 				       CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
 				       &flash_info[i]);
 #endif

 #ifdef	CONFIG_ENV_IS_IN_FLASH
 		/* ENV protection ON by default */
 		if (CONFIG_ENV_ADDR >= flash_info[i].start[0])
 			flash_protect (FLAG_PROTECT_SET,
 				       CONFIG_ENV_ADDR,
 				       CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
 				       &flash_info[i]);
 #endif
 	}

 	return total_size;
 }

 /*-----------------------------------------------------------------------
  */
 void flash_print_info (flash_info_t * info)
 {
 	int i;

 	if (info->flash_id == FLASH_UNKNOWN) {
 		printf ("missing or unknown FLASH type\n");
 		return;
 	}

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case FLASH_MAN_AMD:
 		printf ("AMD ");
 		break;
 	case FLASH_MAN_FUJ:
 		printf ("FUJITSU ");
 		break;
 	case FLASH_MAN_BM:
 		printf ("BRIGHT MICRO ");
 		break;
 	default:
 		printf ("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM040:
 		printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
 		break;
 	case FLASH_AM080:
 		printf ("29F080 or 29LV080 (8 Mbit, uniform sectors)\n");
 		break;
 	case FLASH_AM400B:
 		printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM400T:
 		printf ("AM29LV400T (4 Mbit, top boot sector)\n");
 		break;
 	case FLASH_AM800B:
 		printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM800T:
 		printf ("AM29LV800T (8 Mbit, top boot sector)\n");
 		break;
 	case FLASH_AM160B:
 		printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM160T:
 		printf ("AM29LV160T (16 Mbit, top boot sector)\n");
 		break;
 	case FLASH_AM320B:
 		printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
 		break;
 	case FLASH_AM320T:
 		printf ("AM29LV320T (32 Mbit, top boot sector)\n");
 		break;
 	default:
 		printf ("Unknown Chip Type\n");
 		break;
 	}

 	printf ("  Size: %ld MB in %d Sectors\n", info->size >> 20,
 		info->sector_count);

 	printf ("  Sector Start Addresses:");

 	for (i = 0; i < info->sector_count; ++i) {
 		if ((i % 5) == 0) {
 			printf ("\n   ");
 		}

 		printf (" %08lX%s",
 			info->start[i], info->protect[i] ? " (RO)" : "     ");
 	}

 	printf ("\n");
 }

 /*-----------------------------------------------------------------------
  * The following code can not run from flash!
  */
 static ulong flash_get_size (vu_long * addr, flash_info_t * info)
 {
 	short i;

 	/* Write auto select command: read Manufacturer ID */
 	addr[0x0555] = 0xAAAAAAAA;
 	addr[0x02AA] = 0x55555555;
 	addr[0x0555] = 0x90909090;

 	switch (addr[0]) {
 	case QUAD_ID(AMD_MANUFACT):
 		info->flash_id = FLASH_MAN_AMD;
 		break;

 	case QUAD_ID(FUJ_MANUFACT):
 		info->flash_id = FLASH_MAN_FUJ;
 		break;

 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		break;
 	}

 	switch (addr[1]) {	/* device ID            */
 	case QUAD_ID(AMD_ID_F040B):
 	case QUAD_ID(AMD_ID_LV040B):
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x00200000;
 		break;		/* => 2 MB              */

 	case QUAD_ID(AMD_ID_F080B):
 		info->flash_id += FLASH_AM080;
 		info->sector_count = 16;
 		info->size = 0x00400000;
 		break;		/* => 4 MB              */
 #if 0
 	case AMD_ID_LV400T:
 		info->flash_id += FLASH_AM400T;
 		info->sector_count = 11;
 		info->size = 0x00100000;
 		break;		/* => 1 MB              */

 	case AMD_ID_LV400B:
 		info->flash_id += FLASH_AM400B;
 		info->sector_count = 11;
 		info->size = 0x00100000;
 		break;		/* => 1 MB              */

 	case AMD_ID_LV800T:
 		info->flash_id += FLASH_AM800T;
 		info->sector_count = 19;
 		info->size = 0x00200000;
 		break;		/* => 2 MB              */

 	case AMD_ID_LV800B:
 		info->flash_id += FLASH_AM800B;
 		info->sector_count = 19;
 		info->size = 0x00200000;
 		break;		/* => 2 MB              */

 	case AMD_ID_LV160T:
 		info->flash_id += FLASH_AM160T;
 		info->sector_count = 35;
 		info->size = 0x00400000;
 		break;		/* => 4 MB              */

 	case AMD_ID_LV160B:
 		info->flash_id += FLASH_AM160B;
 		info->sector_count = 35;
 		info->size = 0x00400000;
 		break;		/* => 4 MB              */

 	case AMD_ID_LV320T:
 		info->flash_id += FLASH_AM320T;
 		info->sector_count = 67;
 		info->size = 0x00800000;
 		break;		/* => 8 MB              */

 	case AMD_ID_LV320B:
 		info->flash_id += FLASH_AM320B;
 		info->sector_count = 67;
 		info->size = 0x00800000;
 		break;		/* => 8 MB              */
 #endif /* 0 */
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		return (0);	/* => no or unknown flash */
 	}

 #if 0
 	/* set up sector start address table */
 	if (info->flash_id & FLASH_BTYPE) {
 		/* set sector offsets for bottom boot block type        */
 		info->start[0] = base + 0x00000000;
 		info->start[1] = base + 0x00008000;
 		info->start[2] = base + 0x0000C000;
 		info->start[3] = base + 0x00010000;
 		for (i = 4; i < info->sector_count; i++) {
 			info->start[i] = base + (i * 0x00020000) - 0x00060000;
 		}
 	} else {
 		/* set sector offsets for top boot block type           */
 		i = info->sector_count - 1;
 		info->start[i--] = base + info->size - 0x00008000;
 		info->start[i--] = base + info->size - 0x0000C000;
 		info->start[i--] = base + info->size - 0x00010000;
 		for (; i >= 0; i--) {
 			info->start[i] = base + i * 0x00020000;
 		}
 	}
 #else
 	/* set sector offsets for uniform sector type */
 	for (i = 0; i < info->sector_count; i++)
 		info->start[i] = (ulong)addr + (i * 0x00040000);
 #endif

 	/* check for protected sectors */
 	for (i = 0; i < info->sector_count; i++) {
 		/* read sector protection at sector address, (A7 .. A0) = 0x02 */
 		/* D0 = 1 if protected */
 		addr = (volatile unsigned long *) (info->start[i]);
 		info->protect[i] = addr[2] & 1;
 	}

 	if (info->flash_id != FLASH_UNKNOWN) {
 		addr = (volatile unsigned long *) info->start[0];
 		*addr = 0xF0F0F0F0;	/* reset bank */
 	}

 	return (info->size);
 }

 /*-----------------------------------------------------------------------
  */
 int flash_erase (flash_info_t * info, int s_first, int s_last)
 {
 	vu_long *addr = (vu_long *) (info->start[0]);
 	int flag, prot, sect, l_sect;
 	ulong start, now, last;

 	if ((s_first < 0) || (s_first > s_last)) {
 		if (info->flash_id == FLASH_UNKNOWN) {
 			printf ("- missing\n");
 		} else {
 			printf ("- no sectors to erase\n");
 		}
 		return ERR_INVAL;
 	}

 	if ((info->flash_id == FLASH_UNKNOWN) ||
 	    (info->flash_id > FLASH_AMD_COMP)) {
 		printf ("Can't erase unknown flash type - aborted\n");
 		return ERR_UNKNOWN_FLASH_TYPE;
 	}

 	prot = 0;
 	for (sect = s_first; sect <= s_last; ++sect) {
 		if (info->protect[sect]) {
 			prot++;
 		}
 	}

 	if (prot) {
 		printf ("- Warning: %d protected sectors will not be erased!\n", prot);
 	} else {
 		printf ("\n");
 	}

 	l_sect = -1;

 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts ();

 	addr[0x0555] = 0xAAAAAAAA;
 	addr[0x02AA] = 0x55555555;
 	addr[0x0555] = 0x80808080;
 	addr[0x0555] = 0xAAAAAAAA;
 	addr[0x02AA] = 0x55555555;

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (vu_long *) (info->start[sect]);
 			addr[0] = 0x30303030;
 			l_sect = sect;
 		}
 	}

 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts ();

 	/* wait at least 80us - let's wait 1 ms */
 	udelay (1000);

 	/*
 	 * We wait for the last triggered sector
 	 */
 	if (l_sect < 0)
 		goto DONE;

 	start = get_timer (0);
 	last = start;
 	addr = (vu_long *) (info->start[l_sect]);
 	while ((addr[0] & 0xFFFFFFFF) != 0xFFFFFFFF)
 	{
 		if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 			printf ("Timeout\n");
 			return ERR_TIMOUT;
 		}
 		/* show that we're waiting */
 		if ((now - last) > 1000) {	/* every second */
 			putc ('.');
 			last = now;
 		}
 	}

       DONE:
 	/* reset to read mode */
 	addr = (volatile unsigned long *) info->start[0];
 	addr[0] = 0xF0F0F0F0;	/* reset bank */

 	printf (" done\n");

 	return 0;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	ulong cp, wp, data;
 	int i, l, rc;

 	wp = (addr & ~3);	/* get lower word aligned address */

 	/*
 	 * handle unaligned start bytes
 	 */
 	if ((l = addr - wp) != 0) {
 		data = 0;
 		for (i = 0, cp = wp; i < l; ++i, ++cp) {
 			data = (data << 8) | (*(uchar *) cp);
 		}
 		for (; i < 4 && cnt > 0; ++i) {
 			data = (data << 8) | *src++;
 			--cnt;
 			++cp;
 		}
 		for (; cnt == 0 && i < 4; ++i, ++cp) {
 			data = (data << 8) | (*(uchar *) cp);
 		}

 		if ((rc = write_word (info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 4) {
 		data = 0;
 		for (i = 0; i < 4; ++i) {
 			data = (data << 8) | *src++;
 		}
 		if ((rc = write_word (info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 4;
 		cnt -= 4;
 	}

 	if (cnt == 0) {
 		return (0);
 	}

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
 		data = (data << 8) | *src++;
 		--cnt;
 	}
 	for (; i < 4; ++i, ++cp) {
 		data = (data << 8) | (*(uchar *) cp);
 	}

 	return (write_word (info, wp, data));
 }

 /*-----------------------------------------------------------------------
  * Write a word to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  */
 static int write_word (flash_info_t * info, ulong dest, ulong data)
 {
 	vu_long *addr = (vu_long *) (info->start[0]);
 	ulong start;
 	int flag;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*((vu_long *) dest) & data) != data) {
 		return ERR_NOT_ERASED;
 	}
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts ();

 	addr[0x0555] = 0xAAAAAAAA;
 	addr[0x02AA] = 0x55555555;
 	addr[0x0555] = 0xA0A0A0A0;

 	*((vu_long *) dest) = data;

 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts ();

 	/* data polling for D7 */
 	start = get_timer (0);
 	while ((*((vu_long *) dest) & 0x80808080) != (data & 0x80808080))
 	{
 		if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 			return ERR_TIMOUT;
 		}
 	}
 	return (0);
 }
	/*
	* (C) Copyright 2000
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <mpc8xx.h>

	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */

	#if defined(CONFIG_ENV_IS_IN_FLASH)
	# ifndef CONFIG_ENV_ADDR
	# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
	# endif
	# ifndef CONFIG_ENV_SIZE
	# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
	# endif
	# ifndef CONFIG_ENV_SECT_SIZE
	# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
	# endif
	#endif

	#define QUAD_ID(id) ((((ulong)(id) & 0xFF) << 24) \| \
	(((ulong)(id) & 0xFF) << 16) \| \
	(((ulong)(id) & 0xFF) << 8) \| \
	(((ulong)(id) & 0xFF) << 0) \
	)

	/*-----------------------------------------------------------------------
	* Functions
	*/
	static ulong flash_get_size (vu_long * addr, flash_info_t * info);
	static int write_word (flash_info_t * info, ulong dest, ulong data);

	/*-----------------------------------------------------------------------
	*/
	unsigned long flash_init (void)
	{
	volatile immap_t immap = (immap_t ) CONFIG_SYS_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	vu_long bcsr = (vu_long )BCSR_ADDR;
	unsigned long pd_size, total_size, bsize, or_am;
	int i;

	/* Init: no FLASHes known */
	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
	flash_info[i].flash_id = FLASH_UNKNOWN;
	flash_info[i].size = 0;
	flash_info[i].sector_count = 0;
	flash_info[i].start[0] = 0xFFFFFFFF; /* For TFTP */
	}

	switch ((bcsr[2] & BCSR2_FLASH_PD_MASK) >> BCSR2_FLASH_PD_SHIFT) {
	case 2:
	case 4:
	case 6:
	pd_size = 0x800000;
	or_am = 0xFF800000;
	break;

	case 5:
	case 7:
	pd_size = 0x400000;
	or_am = 0xFFC00000;
	break;

	case 8:
	pd_size = 0x200000;
	or_am = 0xFFE00000;
	break;

	default:
	pd_size = 0;
	or_am = 0xFFE00000;
	printf("## Unsupported flash detected by BCSR: 0x%08lX\n", bcsr[2]);
	}

	total_size = 0;
	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS && total_size < pd_size; ++i) {
	bsize = flash_get_size((vu_long *)(CONFIG_SYS_FLASH_BASE + total_size),
	&flash_info[i]);

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

	total_size += bsize;
	}

	if (total_size != pd_size) {
	printf("## Detected flash size %lu conflicts with PD data %lu\n",
	total_size, pd_size);
	}

	/* Remap FLASH according to real size */
	memctl->memc_or0 = or_am \| CONFIG_SYS_OR_TIMING_FLASH;

	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS && flash_info[i].size != 0; ++i) {
	#if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
	/* monitor protection ON by default */
	if (CONFIG_SYS_MONITOR_BASE >= flash_info[i].start[0])
	flash_protect (FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE + monitor_flash_len - 1,
	&flash_info[i]);
	#endif

	#ifdef CONFIG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	if (CONFIG_ENV_ADDR >= flash_info[i].start[0])
	flash_protect (FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1,
	&flash_info[i]);
	#endif
	}

	return total_size;
	}

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info (flash_info_t * info)
	{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
	printf ("missing or unknown FLASH type\n");
	return;
	}

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_AMD:
	printf ("AMD ");
	break;
	case FLASH_MAN_FUJ:
	printf ("FUJITSU ");
	break;
	case FLASH_MAN_BM:
	printf ("BRIGHT MICRO ");
	break;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	printf ("29F040 or 29LV040 (4 Mbit, uniform sectors)\n");
	break;
	case FLASH_AM080:
	printf ("29F080 or 29LV080 (8 Mbit, uniform sectors)\n");
	break;
	case FLASH_AM400B:
	printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM400T:
	printf ("AM29LV400T (4 Mbit, top boot sector)\n");
	break;
	case FLASH_AM800B:
	printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM800T:
	printf ("AM29LV800T (8 Mbit, top boot sector)\n");
	break;
	case FLASH_AM160B:
	printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM160T:
	printf ("AM29LV160T (16 Mbit, top boot sector)\n");
	break;
	case FLASH_AM320B:
	printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
	break;
	case FLASH_AM320T:
	printf ("AM29LV320T (32 Mbit, top boot sector)\n");
	break;
	default:
	printf ("Unknown Chip Type\n");
	break;
	}

	printf (" Size: %ld MB in %d Sectors\n", info->size >> 20,
	info->sector_count);

	printf (" Sector Start Addresses:");

	for (i = 0; i < info->sector_count; ++i) {
	if ((i % 5) == 0) {
	printf ("\n ");
	}

	printf (" %08lX%s",
	info->start[i], info->protect[i] ? " (RO)" : " ");
	}

	printf ("\n");
	}

	/*-----------------------------------------------------------------------
	* The following code can not run from flash!
	*/
	static ulong flash_get_size (vu_long * addr, flash_info_t * info)
	{
	short i;

	/* Write auto select command: read Manufacturer ID */
	addr[0x0555] = 0xAAAAAAAA;
	addr[0x02AA] = 0x55555555;
	addr[0x0555] = 0x90909090;

	switch (addr[0]) {
	case QUAD_ID(AMD_MANUFACT):
	info->flash_id = FLASH_MAN_AMD;
	break;

	case QUAD_ID(FUJ_MANUFACT):
	info->flash_id = FLASH_MAN_FUJ;
	break;

	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	break;
	}

	switch (addr[1]) { /* device ID */
	case QUAD_ID(AMD_ID_F040B):
	case QUAD_ID(AMD_ID_LV040B):
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case QUAD_ID(AMD_ID_F080B):
	info->flash_id += FLASH_AM080;
	info->sector_count = 16;
	info->size = 0x00400000;
	break; /* => 4 MB */
	#if 0
	case AMD_ID_LV400T:
	info->flash_id += FLASH_AM400T;
	info->sector_count = 11;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case AMD_ID_LV400B:
	info->flash_id += FLASH_AM400B;
	info->sector_count = 11;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case AMD_ID_LV800T:
	info->flash_id += FLASH_AM800T;
	info->sector_count = 19;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case AMD_ID_LV800B:
	info->flash_id += FLASH_AM800B;
	info->sector_count = 19;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case AMD_ID_LV160T:
	info->flash_id += FLASH_AM160T;
	info->sector_count = 35;
	info->size = 0x00400000;
	break; /* => 4 MB */

	case AMD_ID_LV160B:
	info->flash_id += FLASH_AM160B;
	info->sector_count = 35;
	info->size = 0x00400000;
	break; /* => 4 MB */

	case AMD_ID_LV320T:
	info->flash_id += FLASH_AM320T;
	info->sector_count = 67;
	info->size = 0x00800000;
	break; /* => 8 MB */

	case AMD_ID_LV320B:
	info->flash_id += FLASH_AM320B;
	info->sector_count = 67;
	info->size = 0x00800000;
	break; /* => 8 MB */
	#endif /* 0 */
	default:
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* => no or unknown flash */
	}

	#if 0
	/* set up sector start address table */
	if (info->flash_id & FLASH_BTYPE) {
	/* set sector offsets for bottom boot block type */
	info->start[0] = base + 0x00000000;
	info->start[1] = base + 0x00008000;
	info->start[2] = base + 0x0000C000;
	info->start[3] = base + 0x00010000;
	for (i = 4; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00020000) - 0x00060000;
	}
	} else {
	/* set sector offsets for top boot block type */
	i = info->sector_count - 1;
	info->start[i--] = base + info->size - 0x00008000;
	info->start[i--] = base + info->size - 0x0000C000;
	info->start[i--] = base + info->size - 0x00010000;
	for (; i >= 0; i--) {
	info->start[i] = base + i * 0x00020000;
	}
	}
	#else
	/* set sector offsets for uniform sector type */
	for (i = 0; i < info->sector_count; i++)
	info->start[i] = (ulong)addr + (i * 0x00040000);
	#endif

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
	/* read sector protection at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	addr = (volatile unsigned long *) (info->start[i]);
	info->protect[i] = addr[2] & 1;
	}

	if (info->flash_id != FLASH_UNKNOWN) {
	addr = (volatile unsigned long *) info->start[0];
	addr = 0xF0F0F0F0; / reset bank */
	}

	return (info->size);
	}

	/*-----------------------------------------------------------------------
	*/
	int flash_erase (flash_info_t * info, int s_first, int s_last)
	{
	vu_long addr = (vu_long ) (info->start[0]);
	int flag, prot, sect, l_sect;
	ulong start, now, last;

	if ((s_first < 0) \|\| (s_first > s_last)) {
	if (info->flash_id == FLASH_UNKNOWN) {
	printf ("- missing\n");
	} else {
	printf ("- no sectors to erase\n");
	}
	return ERR_INVAL;
	}

	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	(info->flash_id > FLASH_AMD_COMP)) {
	printf ("Can't erase unknown flash type - aborted\n");
	return ERR_UNKNOWN_FLASH_TYPE;
	}

	prot = 0;
	for (sect = s_first; sect <= s_last; ++sect) {
	if (info->protect[sect]) {
	prot++;
	}
	}

	if (prot) {
	printf ("- Warning: %d protected sectors will not be erased!\n", prot);
	} else {
	printf ("\n");
	}

	l_sect = -1;

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();

	addr[0x0555] = 0xAAAAAAAA;
	addr[0x02AA] = 0x55555555;
	addr[0x0555] = 0x80808080;
	addr[0x0555] = 0xAAAAAAAA;
	addr[0x02AA] = 0x55555555;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (vu_long *) (info->start[sect]);
	addr[0] = 0x30303030;
	l_sect = sect;
	}
	}

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts ();

	/* wait at least 80us - let's wait 1 ms */
	udelay (1000);

	/*
	* We wait for the last triggered sector
	*/
	if (l_sect < 0)
	goto DONE;

	start = get_timer (0);
	last = start;
	addr = (vu_long *) (info->start[l_sect]);
	while ((addr[0] & 0xFFFFFFFF) != 0xFFFFFFFF)
	{
	if ((now = get_timer (start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf ("Timeout\n");
	return ERR_TIMOUT;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	putc ('.');
	last = now;
	}
	}

	DONE:
	/* reset to read mode */
	addr = (volatile unsigned long *) info->start[0];
	addr[0] = 0xF0F0F0F0; /* reset bank */

	printf (" done\n");

	return 0;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	ulong cp, wp, data;
	int i, l, rc;

	wp = (addr & ~3); /* get lower word aligned address */

	/*
	* handle unaligned start bytes
	*/
	if ((l = addr - wp) != 0) {
	data = 0;
	for (i = 0, cp = wp; i < l; ++i, ++cp) {
	data = (data << 8) \| ((uchar ) cp);
	}
	for (; i < 4 && cnt > 0; ++i) {
	data = (data << 8) \| *src++;
	--cnt;
	++cp;
	}
	for (; cnt == 0 && i < 4; ++i, ++cp) {
	data = (data << 8) \| ((uchar ) cp);
	}

	if ((rc = write_word (info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 4) {
	data = 0;
	for (i = 0; i < 4; ++i) {
	data = (data << 8) \| *src++;
	}
	if ((rc = write_word (info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	cnt -= 4;
	}

	if (cnt == 0) {
	return (0);
	}

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
	data = (data << 8) \| *src++;
	--cnt;
	}
	for (; i < 4; ++i, ++cp) {
	data = (data << 8) \| ((uchar ) cp);
	}

	return (write_word (info, wp, data));
	}

	/*-----------------------------------------------------------------------
	* Write a word to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	*/
	static int write_word (flash_info_t * info, ulong dest, ulong data)
	{
	vu_long addr = (vu_long ) (info->start[0]);
	ulong start;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if ((((vu_long ) dest) & data) != data) {
	return ERR_NOT_ERASED;
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts ();

	addr[0x0555] = 0xAAAAAAAA;
	addr[0x02AA] = 0x55555555;
	addr[0x0555] = 0xA0A0A0A0;

	((vu_long ) dest) = data;

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts ();

	/* data polling for D7 */
	start = get_timer (0);
	while ((((vu_long ) dest) & 0x80808080) != (data & 0x80808080))
	{
	if (get_timer (start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	return ERR_TIMOUT;
	}
	}
	return (0);
	}