board/ocotea/flash.c - platform/external/u-boot - Gitiles

 /*
  * (C) Copyright 2004
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
  * Add support for Am29F016D and dynamic switch setting.
  *
  * 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
  */

 /*
  * Modified 4/5/2001
  * Wait for completion of each sector erase command issued
  * 4/5/2001
  * Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
  */

 #include <common.h>
 #include <ppc4xx.h>
 #include <asm/processor.h>

 #undef DEBUG

 #ifdef DEBUG
 #define DEBUGF(x...) printf(x)
 #else
 #define DEBUGF(x...)
 #endif				/* DEBUG */

 #define     BOOT_SMALL_FLASH        32	/* 00100000 */
 #define     FLASH_ONBD_N            2	/* 00000010 */
 #define     FLASH_SRAM_SEL          1	/* 00000001 */

 #define     BOOT_SMALL_FLASH_VAL    4
 #define     FLASH_ONBD_N_VAL        2
 #define     FLASH_SRAM_SEL_VAL      1


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

 static unsigned long flash_addr_table[8][CFG_MAX_FLASH_BANKS] = {
 	{0xFF800000, 0xFF900000, 0xFFC00000},	/* 0:000: configuraton 4 */
 	{0xFF900000, 0xFF800000, 0xFFC00000},	/* 1:001: configuraton 3 */
 	{0x00000000, 0x00000000, 0x00000000},	/* 2:010: configuraton 8 */
 	{0x00000000, 0x00000000, 0x00000000},	/* 3:011: configuraton 7 */
 	{0xFFE00000, 0xFFF00000, 0xFF800000},	/* 4:100: configuraton 2 */
 	{0xFFF00000, 0xFFF80000, 0xFF800000},	/* 5:101: configuraton 1 */
 	{0x00000000, 0x00000000, 0x00000000},	/* 6:110: configuraton 6 */
 	{0x00000000, 0x00000000, 0x00000000}	/* 7:111: configuraton 5 */
 };

 /*-----------------------------------------------------------------------
  * 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);


 #ifdef CONFIG_OCOTEA
 #define ADDR0           0x5555
 #define ADDR1           0x2aaa
 #define FLASH_WORD_SIZE unsigned char
 #endif

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

 unsigned long flash_init(void)
 {
 	unsigned long total_b = 0;
 	unsigned long size_b[CFG_MAX_FLASH_BANKS];
 	unsigned char *fpga_base = (unsigned char *) CFG_FPGA_BASE;
 	unsigned char switch_status;
 	unsigned short index = 0;
 	int i;

 	/* read FPGA base register FPGA_REG0 */
 	switch_status = *fpga_base;

 	/* check the bitmap of switch status */
 	if (switch_status & BOOT_SMALL_FLASH) {
 		index += BOOT_SMALL_FLASH_VAL;
 	}
 	if (switch_status & FLASH_ONBD_N) {
 		index += FLASH_ONBD_N_VAL;
 	}
 	if (switch_status & FLASH_SRAM_SEL) {
 		index += FLASH_SRAM_SEL_VAL;
 	}

 	DEBUGF("\n");
 	DEBUGF("FLASH: Index: %d\n", index);

 	/* Init: no FLASHes known */
 	for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
 		flash_info[i].flash_id = FLASH_UNKNOWN;
 		flash_info[i].sector_count = -1;
 		flash_info[i].size = 0;

 		/* check whether the address is 0 */
 		if (flash_addr_table[index][i] == 0) {
 			continue;
 		}

 		/* call flash_get_size() to initialize sector address */
 		size_b[i] = flash_get_size((vu_long *) flash_addr_table[index][i], &flash_info[i]);
 		flash_info[i].size = size_b[i];
 		if (flash_info[i].flash_id == FLASH_UNKNOWN) {
 			printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
 				i, size_b[i], size_b[i] << 20);
 			flash_info[i].sector_count = -1;
 			flash_info[i].size = 0;
 		}

 		total_b += flash_info[i].size;
 	}

 	return total_b;
 }

 /*-----------------------------------------------------------------------
  */
 void flash_print_info(flash_info_t * info)
 {
 	int i;
 	int k;
 	int size;
 	int erased;
 	volatile unsigned long *flash;

 	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_SST:
 		printf("SST ");
 		break;
 	default:
 		printf("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AM040:
 		printf("AM29F040 (512 Kbit, uniform sector size)\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;
 	case FLASH_AMDLV033C:
 		printf("AM29LV033C (32 Mbit, top boot sector)\n");
 		break;
 	case FLASH_SST800A:
 		printf("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
 		break;
 	case FLASH_SST160A:
 		printf("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
 		break;
 	default:
 		printf("Unknown Chip Type\n");
 		break;
 	}

 	printf("  Size: %ld KB in %d Sectors\n",
 	       info->size >> 10, info->sector_count);

 	printf("  Sector Start Addresses:");
 	for (i = 0; i < info->sector_count; ++i) {
 		/*
 		 * Check if whole sector is erased
 		 */
 		if (i != (info->sector_count - 1))
 			size = info->start[i + 1] - info->start[i];
 		else
 			size = info->start[0] + info->size - info->start[i];
 		erased = 1;
 		flash = (volatile unsigned long *) info->start[i];
 		size = size >> 2;	/* divide by 4 for longword access */
 		for (k = 0; k < size; k++) {
 			if (*flash++ != 0xffffffff) {
 				erased = 0;
 				break;
 			}
 		}

 		if ((i % 5) == 0)
 			printf("\n   ");
 		printf(" %08lX%s%s",
 		       info->start[i],
 		       erased ? " E" : "  ", info->protect[i] ? "RO " : "   ");
 	}
 	printf("\n");
 	return;
 }

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

 /*
  * The following code cannot be run from FLASH!
  */
 static ulong flash_get_size(vu_long * addr, flash_info_t * info)
 {
 	short i;
 	FLASH_WORD_SIZE value;
 	ulong base = (ulong) addr;
 	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) addr;

 	DEBUGF("FLASH ADDR: %08x\n", (unsigned) addr);

 	/* Write auto select command: read Manufacturer ID */
 	udelay(10000);
 	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 	udelay(1000);
 	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 	udelay(1000);
 	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00900090;
 	udelay(1000);

 	value = addr2[0];
 	DEBUGF("FLASH MANUFACT: %x\n", value);

 	switch (value) {
 	case (FLASH_WORD_SIZE) AMD_MANUFACT:
 		info->flash_id = FLASH_MAN_AMD;
 		break;
 	case (FLASH_WORD_SIZE) FUJ_MANUFACT:
 		info->flash_id = FLASH_MAN_FUJ;
 		break;
 	case (FLASH_WORD_SIZE) SST_MANUFACT:
 		info->flash_id = FLASH_MAN_SST;
 		break;
 	case (FLASH_WORD_SIZE) STM_MANUFACT:
 		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  */
 	}

 	value = addr2[1];		/* device ID            */

 	DEBUGF("\nFLASH DEVICEID: %x\n", value);

 	switch (value) {
 	case (FLASH_WORD_SIZE) AMD_ID_LV040B:
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x0080000;	/* => 512 ko */
 		break;
 	case (FLASH_WORD_SIZE) AMD_ID_F040B:
 		info->flash_id += FLASH_AM040;
 		info->sector_count = 8;
 		info->size = 0x0080000;	/* => 512 ko */
 		break;
 	case (FLASH_WORD_SIZE) AMD_ID_LV033C:
 		info->flash_id += FLASH_AMDLV033C;
 		info->sector_count = 64;
 		info->size = 0x00400000;
 		break;			/* => 4 MB              */
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		return (0);		/* => no or unknown flash */
 	}

 	/* set up sector start address table */
 	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) ||
 	    (info->flash_id == FLASH_AM040) ||
 	    (info->flash_id == FLASH_AMD016)) {
 		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 at sector address, (A7 .. A0) = 0x02 */
 		/* D0 = 1 if protected */
 		addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
 		if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
 			info->protect[i] = 0;
 		else
 			info->protect[i] = addr2[2] & 1;
 	}

 	/* issue bank reset to return to read mode */
 	addr2[0] = (FLASH_WORD_SIZE) 0x00F000F0;

 	/*
 	 * Prevent writes to uninitialized FLASH.
 	 */
 	if (info->flash_id != FLASH_UNKNOWN) {
 		/* ? ? ? */
 	}

 	return (info->size);
 }

 int wait_for_DQ7(flash_info_t * info, int sect)
 {
 	ulong start, now, last;
 	volatile FLASH_WORD_SIZE *addr =
 		(FLASH_WORD_SIZE *) (info->start[sect]);

 	start = get_timer(0);
 	last = start;
 	while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
 	       (FLASH_WORD_SIZE) 0x00800080) {
 		if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
 			printf("Timeout\n");
 			return -1;
 		}
 		/* show that we're waiting */
 		if ((now - last) > 1000) {	/* every second */
 			putc('.');
 			last = now;
 		}
 	}
 	return 0;
 }

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

 int flash_erase(flash_info_t * info, int s_first, int s_last)
 {
 	volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *) (info->start[0]);
 	volatile FLASH_WORD_SIZE *addr2;
 	int flag, prot, sect, l_sect;
 	int i;

 	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) {
 		printf("Can't erase unknown flash type - aborted\n");
 		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();

 	/* Start erase on unprotected sectors */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
 			printf("Erasing sector %p\n", addr2);

 			if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				addr2[0] = (FLASH_WORD_SIZE) 0x00500050;	/* block erase */
 				for (i = 0; i < 50; i++)
 					udelay(1000);	/* wait 1 ms */
 			} else {
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
 				addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 				addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 				addr2[0] = (FLASH_WORD_SIZE) 0x00300030;	/* sector erase */
 			}
 			l_sect = sect;
 			/*
 			 * Wait for each sector to complete, it's more
 			 * reliable.  According to AMD Spec, you must
 			 * issue all erase commands within a specified
 			 * timeout.  This has been seen to fail, especially
 			 * if printf()s are included (for debug)!!
 			 */
 			wait_for_DQ7(info, sect);
 		}
 	}

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

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

 	/* reset to read mode */
 	addr = (FLASH_WORD_SIZE *) info->start[0];
 	addr[0] = (FLASH_WORD_SIZE) 0x00F000F0;	/* 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)
 {
 	volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *) (info->start[0]);
 	volatile FLASH_WORD_SIZE *dest2 = (FLASH_WORD_SIZE *) dest;
 	volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *) & data;
 	ulong start;
 	int i;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*((volatile FLASH_WORD_SIZE *) dest) &
 	     (FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
 		return (2);
 	}

 	for (i = 0; i < 4 / sizeof(FLASH_WORD_SIZE); i++) {
 		int flag;

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

 		addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
 		addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
 		addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;

 		dest2[i] = data2[i];

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

 		/* data polling for D7 */
 		start = get_timer(0);
 		while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
 		       (data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {

 			if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
 				return (1);
 			}
 		}
 	}

 	return (0);
 }
	/*
	* (C) Copyright 2004
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* (C) Copyright 2002 Jun Gu <jung@artesyncp.com>
	* Add support for Am29F016D and dynamic switch setting.
	*
	* 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
	*/

	/*
	* Modified 4/5/2001
	* Wait for completion of each sector erase command issued
	* 4/5/2001
	* Chris Hallinan - DS4.COM, Inc. - clh@net1plus.com
	*/

	#include <common.h>
	#include <ppc4xx.h>
	#include <asm/processor.h>

	#undef DEBUG

	#ifdef DEBUG
	#define DEBUGF(x...) printf(x)
	#else
	#define DEBUGF(x...)
	#endif /* DEBUG */

	#define BOOT_SMALL_FLASH 32 /* 00100000 */
	#define FLASH_ONBD_N 2 /* 00000010 */
	#define FLASH_SRAM_SEL 1 /* 00000001 */

	#define BOOT_SMALL_FLASH_VAL 4
	#define FLASH_ONBD_N_VAL 2
	#define FLASH_SRAM_SEL_VAL 1


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

	static unsigned long flash_addr_table[8][CFG_MAX_FLASH_BANKS] = {
	{0xFF800000, 0xFF900000, 0xFFC00000}, /* 0:000: configuraton 4 */
	{0xFF900000, 0xFF800000, 0xFFC00000}, /* 1:001: configuraton 3 */
	{0x00000000, 0x00000000, 0x00000000}, /* 2:010: configuraton 8 */
	{0x00000000, 0x00000000, 0x00000000}, /* 3:011: configuraton 7 */
	{0xFFE00000, 0xFFF00000, 0xFF800000}, /* 4:100: configuraton 2 */
	{0xFFF00000, 0xFFF80000, 0xFF800000}, /* 5:101: configuraton 1 */
	{0x00000000, 0x00000000, 0x00000000}, /* 6:110: configuraton 6 */
	{0x00000000, 0x00000000, 0x00000000} /* 7:111: configuraton 5 */
	};

	/*-----------------------------------------------------------------------
	* 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);


	#ifdef CONFIG_OCOTEA
	#define ADDR0 0x5555
	#define ADDR1 0x2aaa
	#define FLASH_WORD_SIZE unsigned char
	#endif

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

	unsigned long flash_init(void)
	{
	unsigned long total_b = 0;
	unsigned long size_b[CFG_MAX_FLASH_BANKS];
	unsigned char fpga_base = (unsigned char ) CFG_FPGA_BASE;
	unsigned char switch_status;
	unsigned short index = 0;
	int i;

	/* read FPGA base register FPGA_REG0 */
	switch_status = *fpga_base;

	/* check the bitmap of switch status */
	if (switch_status & BOOT_SMALL_FLASH) {
	index += BOOT_SMALL_FLASH_VAL;
	}
	if (switch_status & FLASH_ONBD_N) {
	index += FLASH_ONBD_N_VAL;
	}
	if (switch_status & FLASH_SRAM_SEL) {
	index += FLASH_SRAM_SEL_VAL;
	}

	DEBUGF("\n");
	DEBUGF("FLASH: Index: %d\n", index);

	/* Init: no FLASHes known */
	for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
	flash_info[i].flash_id = FLASH_UNKNOWN;
	flash_info[i].sector_count = -1;
	flash_info[i].size = 0;

	/* check whether the address is 0 */
	if (flash_addr_table[index][i] == 0) {
	continue;
	}

	/* call flash_get_size() to initialize sector address */
	size_b[i] = flash_get_size((vu_long *) flash_addr_table[index][i], &flash_info[i]);
	flash_info[i].size = size_b[i];
	if (flash_info[i].flash_id == FLASH_UNKNOWN) {
	printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
	i, size_b[i], size_b[i] << 20);
	flash_info[i].sector_count = -1;
	flash_info[i].size = 0;
	}

	total_b += flash_info[i].size;
	}

	return total_b;
	}

	/*-----------------------------------------------------------------------
	*/
	void flash_print_info(flash_info_t * info)
	{
	int i;
	int k;
	int size;
	int erased;
	volatile unsigned long *flash;

	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_SST:
	printf("SST ");
	break;
	default:
	printf("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AM040:
	printf("AM29F040 (512 Kbit, uniform sector size)\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;
	case FLASH_AMDLV033C:
	printf("AM29LV033C (32 Mbit, top boot sector)\n");
	break;
	case FLASH_SST800A:
	printf("SST39LF/VF800 (8 Mbit, uniform sector size)\n");
	break;
	case FLASH_SST160A:
	printf("SST39LF/VF160 (16 Mbit, uniform sector size)\n");
	break;
	default:
	printf("Unknown Chip Type\n");
	break;
	}

	printf(" Size: %ld KB in %d Sectors\n",
	info->size >> 10, info->sector_count);

	printf(" Sector Start Addresses:");
	for (i = 0; i < info->sector_count; ++i) {
	/*
	* Check if whole sector is erased
	*/
	if (i != (info->sector_count - 1))
	size = info->start[i + 1] - info->start[i];
	else
	size = info->start[0] + info->size - info->start[i];
	erased = 1;
	flash = (volatile unsigned long *) info->start[i];
	size = size >> 2; /* divide by 4 for longword access */
	for (k = 0; k < size; k++) {
	if (*flash++ != 0xffffffff) {
	erased = 0;
	break;
	}
	}

	if ((i % 5) == 0)
	printf("\n ");
	printf(" %08lX%s%s",
	info->start[i],
	erased ? " E" : " ", info->protect[i] ? "RO " : " ");
	}
	printf("\n");
	return;
	}

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

	/*
	* The following code cannot be run from FLASH!
	*/
	static ulong flash_get_size(vu_long * addr, flash_info_t * info)
	{
	short i;
	FLASH_WORD_SIZE value;
	ulong base = (ulong) addr;
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE ) addr;

	DEBUGF("FLASH ADDR: %08x\n", (unsigned) addr);

	/* Write auto select command: read Manufacturer ID */
	udelay(10000);
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	udelay(1000);
	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	udelay(1000);
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00900090;
	udelay(1000);

	value = addr2[0];
	DEBUGF("FLASH MANUFACT: %x\n", value);

	switch (value) {
	case (FLASH_WORD_SIZE) AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD;
	break;
	case (FLASH_WORD_SIZE) FUJ_MANUFACT:
	info->flash_id = FLASH_MAN_FUJ;
	break;
	case (FLASH_WORD_SIZE) SST_MANUFACT:
	info->flash_id = FLASH_MAN_SST;
	break;
	case (FLASH_WORD_SIZE) STM_MANUFACT:
	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 */
	}

	value = addr2[1]; /* device ID */

	DEBUGF("\nFLASH DEVICEID: %x\n", value);

	switch (value) {
	case (FLASH_WORD_SIZE) AMD_ID_LV040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x0080000; /* => 512 ko */
	break;
	case (FLASH_WORD_SIZE) AMD_ID_F040B:
	info->flash_id += FLASH_AM040;
	info->sector_count = 8;
	info->size = 0x0080000; /* => 512 ko */
	break;
	case (FLASH_WORD_SIZE) AMD_ID_LV033C:
	info->flash_id += FLASH_AMDLV033C;
	info->sector_count = 64;
	info->size = 0x00400000;
	break; /* => 4 MB */
	default:
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* => no or unknown flash */
	}

	/* set up sector start address table */
	if (((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) \|\|
	(info->flash_id == FLASH_AM040) \|\|
	(info->flash_id == FLASH_AMD016)) {
	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 at sector address, (A7 .. A0) = 0x02 */
	/* D0 = 1 if protected */
	addr2 = (volatile FLASH_WORD_SIZE *) (info->start[i]);
	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST)
	info->protect[i] = 0;
	else
	info->protect[i] = addr2[2] & 1;
	}

	/* issue bank reset to return to read mode */
	addr2[0] = (FLASH_WORD_SIZE) 0x00F000F0;

	/*
	* Prevent writes to uninitialized FLASH.
	*/
	if (info->flash_id != FLASH_UNKNOWN) {
	/* ? ? ? */
	}

	return (info->size);
	}

	int wait_for_DQ7(flash_info_t * info, int sect)
	{
	ulong start, now, last;
	volatile FLASH_WORD_SIZE *addr =
	(FLASH_WORD_SIZE *) (info->start[sect]);

	start = get_timer(0);
	last = start;
	while ((addr[0] & (FLASH_WORD_SIZE) 0x00800080) !=
	(FLASH_WORD_SIZE) 0x00800080) {
	if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
	printf("Timeout\n");
	return -1;
	}
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	putc('.');
	last = now;
	}
	}
	return 0;
	}

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

	int flash_erase(flash_info_t * info, int s_first, int s_last)
	{
	volatile FLASH_WORD_SIZE addr = (FLASH_WORD_SIZE ) (info->start[0]);
	volatile FLASH_WORD_SIZE *addr2;
	int flag, prot, sect, l_sect;
	int i;

	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) {
	printf("Can't erase unknown flash type - aborted\n");
	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();

	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	addr2 = (FLASH_WORD_SIZE *) (info->start[sect]);
	printf("Erasing sector %p\n", addr2);

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_SST) {
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr2[0] = (FLASH_WORD_SIZE) 0x00500050; /* block erase */
	for (i = 0; i < 50; i++)
	udelay(1000); /* wait 1 ms */
	} else {
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00800080;
	addr[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr2[0] = (FLASH_WORD_SIZE) 0x00300030; /* sector erase */
	}
	l_sect = sect;
	/*
	* Wait for each sector to complete, it's more
	* reliable. According to AMD Spec, you must
	* issue all erase commands within a specified
	* timeout. This has been seen to fail, especially
	* if printf()s are included (for debug)!!
	*/
	wait_for_DQ7(info, sect);
	}
	}

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

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

	/* reset to read mode */
	addr = (FLASH_WORD_SIZE *) info->start[0];
	addr[0] = (FLASH_WORD_SIZE) 0x00F000F0; /* 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)
	{
	volatile FLASH_WORD_SIZE addr2 = (FLASH_WORD_SIZE ) (info->start[0]);
	volatile FLASH_WORD_SIZE dest2 = (FLASH_WORD_SIZE ) dest;
	volatile FLASH_WORD_SIZE data2 = (FLASH_WORD_SIZE ) & data;
	ulong start;
	int i;

	/* Check if Flash is (sufficiently) erased */
	if ((((volatile FLASH_WORD_SIZE ) dest) &
	(FLASH_WORD_SIZE) data) != (FLASH_WORD_SIZE) data) {
	return (2);
	}

	for (i = 0; i < 4 / sizeof(FLASH_WORD_SIZE); i++) {
	int flag;

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

	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00AA00AA;
	addr2[ADDR1] = (FLASH_WORD_SIZE) 0x00550055;
	addr2[ADDR0] = (FLASH_WORD_SIZE) 0x00A000A0;

	dest2[i] = data2[i];

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

	/* data polling for D7 */
	start = get_timer(0);
	while ((dest2[i] & (FLASH_WORD_SIZE) 0x00800080) !=
	(data2[i] & (FLASH_WORD_SIZE) 0x00800080)) {

	if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
	return (1);
	}
	}
	}

	return (0);
	}