board/netta2/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2000-2004
  * 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    */

 /*-----------------------------------------------------------------------
  * Functions
  */
 static ulong flash_get_size(vu_long * addr, flash_info_t * info);
 static int write_byte(flash_info_t * info, ulong dest, uchar data);
 static void flash_get_offsets(ulong base, flash_info_t * info);

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

 unsigned long flash_init(void)
 {
 	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
 	volatile memctl8xx_t *memctl = &immap->im_memctl;
 	unsigned long size;
 	int i;

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

 	size = flash_get_size((vu_long *) FLASH_BASE0_PRELIM, &flash_info[0]);

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

 	/* Remap FLASH according to real size */
 	memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH | (-size & 0xFFFF8000);
 	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) | (memctl->memc_br0 & ~(BR_BA_MSK));

 	/* Re-do sizing to get full correct info */
 	size = flash_get_size((vu_long *) CONFIG_SYS_FLASH_BASE, &flash_info[0]);

 	flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);

 	/* monitor protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 			CONFIG_SYS_FLASH_BASE, CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
 			&flash_info[0]);

 	flash_protect ( FLAG_PROTECT_SET,
 			CONFIG_ENV_ADDR,
 			CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
 			&flash_info[0]);

 #ifdef CONFIG_ENV_ADDR_REDUND
 	flash_protect ( FLAG_PROTECT_SET,
 			CONFIG_ENV_ADDR_REDUND,
 			CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
 			&flash_info[0]);
 #endif

 	flash_info[0].size = size;

 	return (size);
 }

 /*-----------------------------------------------------------------------
  */
 static void flash_get_offsets(ulong base, flash_info_t * info)
 {
 	int i;

 	/* set up sector start address table */
 	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
 		for (i = 0; i < info->sector_count; i++) {
 			info->start[i] = base + (i * 0x00010000);
 		}
 	} else if (info->flash_id & FLASH_BTYPE) {
 		/* set sector offsets for bottom boot block type    */
 		info->start[0] = base + 0x00000000;
 		info->start[1] = base + 0x00004000;
 		info->start[2] = base + 0x00006000;
 		info->start[3] = base + 0x00008000;
 		for (i = 4; i < info->sector_count; i++) {
 			info->start[i] = base + (i * 0x00010000) - 0x00030000;
 		}
 	} else {
 		/* set sector offsets for top boot block type       */
 		i = info->sector_count - 1;
 		info->start[i--] = base + info->size - 0x00004000;
 		info->start[i--] = base + info->size - 0x00006000;
 		info->start[i--] = base + info->size - 0x00008000;
 		for (; i >= 0; i--) {
 			info->start[i] = base + i * 0x00010000;
 		}
 	}
 }

 /*-----------------------------------------------------------------------
  */
 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_MX:
 		printf("MXIC ");
 		break;
 	default:
 		printf("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM040:
 		printf("AM29LV040B (4 Mbit, bottom boot sect)\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 cannot be run from FLASH!
  */

 static ulong flash_get_size(vu_long * addr, flash_info_t * info)
 {
 	short i;
 	uchar mid;
 	uchar pid;
 	vu_char *caddr = (vu_char *) addr;
 	ulong base = (ulong) addr;

 	/* Write auto select command: read Manufacturer ID */
 	caddr[0x0555] = 0xAA;
 	caddr[0x02AA] = 0x55;
 	caddr[0x0555] = 0x90;

 	mid = caddr[0];
 	switch (mid) {
 	case (AMD_MANUFACT & 0xFF):
 		info->flash_id = FLASH_MAN_AMD;
 		break;
 	case (FUJ_MANUFACT & 0xFF):
 		info->flash_id = FLASH_MAN_FUJ;
 		break;
 	case (MX_MANUFACT & 0xFF):
 		info->flash_id = FLASH_MAN_MX;
 		break;
 	case (STM_MANUFACT & 0xFF):
 		info->flash_id = FLASH_MAN_STM;
 		break;
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		return (0);				/* no or unknown flash  */
 	}

 	pid = caddr[1];				/* device ID        */
 	switch (pid) {
 	case (AMD_ID_LV400T & 0xFF):
 		info->flash_id += FLASH_AM400T;
 		info->sector_count = 11;
 		info->size = 0x00080000;
 		break;					/* => 512 kB        */

 	case (AMD_ID_LV400B & 0xFF):
 		info->flash_id += FLASH_AM400B;
 		info->sector_count = 11;
 		info->size = 0x00080000;
 		break;					/* => 512 kB        */

 	case (AMD_ID_LV800T & 0xFF):
 		info->flash_id += FLASH_AM800T;
 		info->sector_count = 19;
 		info->size = 0x00100000;
 		break;					/* => 1 MB      */

 	case (AMD_ID_LV800B & 0xFF):
 		info->flash_id += FLASH_AM800B;
 		info->sector_count = 19;
 		info->size = 0x00100000;
 		break;					/* => 1 MB      */

 	case (AMD_ID_LV160T & 0xFF):
 		info->flash_id += FLASH_AM160T;
 		info->sector_count = 35;
 		info->size = 0x00200000;
 		break;					/* => 2 MB      */

 	case (AMD_ID_LV160B & 0xFF):
 		info->flash_id += FLASH_AM160B;
 		info->sector_count = 35;
 		info->size = 0x00200000;
 		break;					/* => 2 MB      */

 	case (AMD_ID_LV040B & 0xFF):
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x00080000;
 		break;

 	case (STM_ID_M29W040B & 0xFF):
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x00080000;
 		break;

 #if 0							/* enable when device IDs are available */
 	case (AMD_ID_LV320T & 0xFF):
 		info->flash_id += FLASH_AM320T;
 		info->sector_count = 67;
 		info->size = 0x00400000;
 		break;					/* => 4 MB      */

 	case (AMD_ID_LV320B & 0xFF):
 		info->flash_id += FLASH_AM320B;
 		info->sector_count = 67;
 		info->size = 0x00400000;
 		break;					/* => 4 MB      */
 #endif
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		return (0);				/* => no or unknown flash */

 	}

 	printf(" ");
 	/* set up sector start address table */
 	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
 		for (i = 0; i < info->sector_count; i++) {
 			info->start[i] = base + (i * 0x00010000);
 		}
 	} else if (info->flash_id & FLASH_BTYPE) {
 		/* set sector offsets for bottom boot block type    */
 		info->start[0] = base + 0x00000000;
 		info->start[1] = base + 0x00004000;
 		info->start[2] = base + 0x00006000;
 		info->start[3] = base + 0x00008000;
 		for (i = 4; i < info->sector_count; i++) {
 			info->start[i] = base + (i * 0x00010000) - 0x00030000;
 		}
 	} else {
 		/* set sector offsets for top boot block type       */
 		i = info->sector_count - 1;
 		info->start[i--] = base + info->size - 0x00004000;
 		info->start[i--] = base + info->size - 0x00006000;
 		info->start[i--] = base + info->size - 0x00008000;
 		for (; i >= 0; i--) {
 			info->start[i] = base + i * 0x00010000;
 		}
 	}

 	/* check for protected sectors */
 	for (i = 0; i < info->sector_count; i++) {
 		/* read sector protection: D0 = 1 if protected */
 		caddr = (volatile unsigned char *)(info->start[i]);
 		info->protect[i] = caddr[2] & 1;
 	}

 	/*
 	 * Prevent writes to uninitialized FLASH.
 	 */
 	if (info->flash_id != FLASH_UNKNOWN) {
 		caddr = (vu_char *) info->start[0];

 		caddr[0x0555] = 0xAA;
 		caddr[0x02AA] = 0x55;
 		caddr[0x0555] = 0xF0;

 		udelay(20000);
 	}

 	return (info->size);
 }


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

 int flash_erase(flash_info_t * info, int s_first, int s_last)
 {
 	vu_char *addr = (vu_char *) (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 1;
 	}

 	if ((info->flash_id == FLASH_UNKNOWN) ||
 	    (info->flash_id > FLASH_AMD_COMP)) {
 		printf("Can't erase unknown flash type %08lx - aborted\n", info->flash_id);
 		return 1;
 	}

 	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] = 0xAA;
 	addr[0x02AA] = 0x55;
 	addr[0x0555] = 0x80;
 	addr[0x0555] = 0xAA;
 	addr[0x02AA] = 0x55;

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr = (vu_char *) (info->start[sect]);
 			addr[0] = 0x30;
 			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_char *) (info->start[l_sect]);
 	while ((addr[0] & 0x80) != 0x80) {
 		if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
 			printf("Timeout\n");
 			return 1;
 		}
 		/* show that we're waiting */
 		if ((now - last) > 1000) {	/* every second */
 			putc('.');
 			last = now;
 		}
 	}

 DONE:
 	/* reset to read mode */
 	addr = (vu_char *) info->start[0];
 	addr[0] = 0xF0;				/* 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)
 {
 	int rc;

 	while (cnt > 0) {
 		if ((rc = write_byte(info, addr++, *src++)) != 0) {
 			return (rc);
 		}
 		--cnt;
 	}

 	return (0);
 }

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

 	/* Check if Flash is (sufficiently) erased */
 	if ((*((vu_char *) dest) & data) != data) {
 		return (2);
 	}
 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 	addr[0x0555] = 0xAA;
 	addr[0x02AA] = 0x55;
 	addr[0x0555] = 0xA0;

 	*((vu_char *) dest) = data;

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

 	/* data polling for D7 */
 	start = get_timer(0);
 	while ((*((vu_char *) dest) & 0x80) != (data & 0x80)) {
 		if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 			return (1);
 		}
 	}
 	return (0);
 }
	/*
	* (C) Copyright 2000-2004
	* 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 */

	/*-----------------------------------------------------------------------
	* Functions
	*/
	static ulong flash_get_size(vu_long * addr, flash_info_t * info);
	static int write_byte(flash_info_t * info, ulong dest, uchar data);
	static void flash_get_offsets(ulong base, flash_info_t * info);

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

	unsigned long flash_init(void)
	{
	volatile immap_t immap = (immap_t ) CONFIG_SYS_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	unsigned long size;
	int i;

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

	size = flash_get_size((vu_long *) FLASH_BASE0_PRELIM, &flash_info[0]);

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

	/* Remap FLASH according to real size */
	memctl->memc_or0 = CONFIG_SYS_OR_TIMING_FLASH \| (-size & 0xFFFF8000);
	memctl->memc_br0 = (CONFIG_SYS_FLASH_BASE & BR_BA_MSK) \| (memctl->memc_br0 & ~(BR_BA_MSK));

	/* Re-do sizing to get full correct info */
	size = flash_get_size((vu_long *) CONFIG_SYS_FLASH_BASE, &flash_info[0]);

	flash_get_offsets(CONFIG_SYS_FLASH_BASE, &flash_info[0]);

	/* monitor protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_SYS_FLASH_BASE, CONFIG_SYS_FLASH_BASE + monitor_flash_len - 1,
	&flash_info[0]);

	flash_protect ( FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SECT_SIZE - 1,
	&flash_info[0]);

	#ifdef CONFIG_ENV_ADDR_REDUND
	flash_protect ( FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR_REDUND,
	CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1,
	&flash_info[0]);
	#endif

	flash_info[0].size = size;

	return (size);
	}

	/*-----------------------------------------------------------------------
	*/
	static void flash_get_offsets(ulong base, flash_info_t * info)
	{
	int i;

	/* set up sector start address table */
	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
	for (i = 0; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000);
	}
	} else if (info->flash_id & FLASH_BTYPE) {
	/* set sector offsets for bottom boot block type */
	info->start[0] = base + 0x00000000;
	info->start[1] = base + 0x00004000;
	info->start[2] = base + 0x00006000;
	info->start[3] = base + 0x00008000;
	for (i = 4; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	}
	} else {
	/* set sector offsets for top boot block type */
	i = info->sector_count - 1;
	info->start[i--] = base + info->size - 0x00004000;
	info->start[i--] = base + info->size - 0x00006000;
	info->start[i--] = base + info->size - 0x00008000;
	for (; i >= 0; i--) {
	info->start[i] = base + i * 0x00010000;
	}
	}
	}

	/*-----------------------------------------------------------------------
	*/
	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_MX:
	printf("MXIC ");
	break;
	default:
	printf("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	printf("AM29LV040B (4 Mbit, bottom boot sect)\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 cannot be run from FLASH!
	*/

	static ulong flash_get_size(vu_long * addr, flash_info_t * info)
	{
	short i;
	uchar mid;
	uchar pid;
	vu_char caddr = (vu_char ) addr;
	ulong base = (ulong) addr;

	/* Write auto select command: read Manufacturer ID */
	caddr[0x0555] = 0xAA;
	caddr[0x02AA] = 0x55;
	caddr[0x0555] = 0x90;

	mid = caddr[0];
	switch (mid) {
	case (AMD_MANUFACT & 0xFF):
	info->flash_id = FLASH_MAN_AMD;
	break;
	case (FUJ_MANUFACT & 0xFF):
	info->flash_id = FLASH_MAN_FUJ;
	break;
	case (MX_MANUFACT & 0xFF):
	info->flash_id = FLASH_MAN_MX;
	break;
	case (STM_MANUFACT & 0xFF):
	info->flash_id = FLASH_MAN_STM;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}

	pid = caddr[1]; /* device ID */
	switch (pid) {
	case (AMD_ID_LV400T & 0xFF):
	info->flash_id += FLASH_AM400T;
	info->sector_count = 11;
	info->size = 0x00080000;
	break; /* => 512 kB */

	case (AMD_ID_LV400B & 0xFF):
	info->flash_id += FLASH_AM400B;
	info->sector_count = 11;
	info->size = 0x00080000;
	break; /* => 512 kB */

	case (AMD_ID_LV800T & 0xFF):
	info->flash_id += FLASH_AM800T;
	info->sector_count = 19;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (AMD_ID_LV800B & 0xFF):
	info->flash_id += FLASH_AM800B;
	info->sector_count = 19;
	info->size = 0x00100000;
	break; /* => 1 MB */

	case (AMD_ID_LV160T & 0xFF):
	info->flash_id += FLASH_AM160T;
	info->sector_count = 35;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case (AMD_ID_LV160B & 0xFF):
	info->flash_id += FLASH_AM160B;
	info->sector_count = 35;
	info->size = 0x00200000;
	break; /* => 2 MB */

	case (AMD_ID_LV040B & 0xFF):
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x00080000;
	break;

	case (STM_ID_M29W040B & 0xFF):
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x00080000;
	break;

	#if 0 /* enable when device IDs are available */
	case (AMD_ID_LV320T & 0xFF):
	info->flash_id += FLASH_AM320T;
	info->sector_count = 67;
	info->size = 0x00400000;
	break; /* => 4 MB */

	case (AMD_ID_LV320B & 0xFF):
	info->flash_id += FLASH_AM320B;
	info->sector_count = 67;
	info->size = 0x00400000;
	break; /* => 4 MB */
	#endif
	default:
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* => no or unknown flash */

	}

	printf(" ");
	/* set up sector start address table */
	if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
	for (i = 0; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000);
	}
	} else if (info->flash_id & FLASH_BTYPE) {
	/* set sector offsets for bottom boot block type */
	info->start[0] = base + 0x00000000;
	info->start[1] = base + 0x00004000;
	info->start[2] = base + 0x00006000;
	info->start[3] = base + 0x00008000;
	for (i = 4; i < info->sector_count; i++) {
	info->start[i] = base + (i * 0x00010000) - 0x00030000;
	}
	} else {
	/* set sector offsets for top boot block type */
	i = info->sector_count - 1;
	info->start[i--] = base + info->size - 0x00004000;
	info->start[i--] = base + info->size - 0x00006000;
	info->start[i--] = base + info->size - 0x00008000;
	for (; i >= 0; i--) {
	info->start[i] = base + i * 0x00010000;
	}
	}

	/* check for protected sectors */
	for (i = 0; i < info->sector_count; i++) {
	/* read sector protection: D0 = 1 if protected */
	caddr = (volatile unsigned char *)(info->start[i]);
	info->protect[i] = caddr[2] & 1;
	}

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	caddr = (vu_char *) info->start[0];

	caddr[0x0555] = 0xAA;
	caddr[0x02AA] = 0x55;
	caddr[0x0555] = 0xF0;

	udelay(20000);
	}

	return (info->size);
	}


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

	int flash_erase(flash_info_t * info, int s_first, int s_last)
	{
	vu_char addr = (vu_char ) (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 1;
	}

	if ((info->flash_id == FLASH_UNKNOWN) \|\|
	(info->flash_id > FLASH_AMD_COMP)) {
	printf("Can't erase unknown flash type %08lx - aborted\n", info->flash_id);
	return 1;
	}

	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] = 0xAA;
	addr[0x02AA] = 0x55;
	addr[0x0555] = 0x80;
	addr[0x0555] = 0xAA;
	addr[0x02AA] = 0x55;

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr = (vu_char *) (info->start[sect]);
	addr[0] = 0x30;
	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_char *) (info->start[l_sect]);
	while ((addr[0] & 0x80) != 0x80) {
	if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf("Timeout\n");
	return 1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	putc('.');
	last = now;
	}
	}

	DONE:
	/* reset to read mode */
	addr = (vu_char *) info->start[0];
	addr[0] = 0xF0; /* 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)
	{
	int rc;

	while (cnt > 0) {
	if ((rc = write_byte(info, addr++, *src++)) != 0) {
	return (rc);
	}
	--cnt;
	}

	return (0);
	}

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

	/* Check if Flash is (sufficiently) erased */
	if ((((vu_char ) dest) & data) != data) {
	return (2);
	}
	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	addr[0x0555] = 0xAA;
	addr[0x02AA] = 0x55;
	addr[0x0555] = 0xA0;

	((vu_char ) dest) = data;

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

	/* data polling for D7 */
	start = get_timer(0);
	while ((((vu_char ) dest) & 0x80) != (data & 0x80)) {
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	return (0);
	}