Initial revision

1 files changed, 736 insertions, 0 deletions

diff --git a/board/ebony/flash.c b/board/ebony/flash.c
new file mode 100644
index 00000000000..6efd566e896
--- /dev/null
+++ b/board/ebony/flash.c
@@ -0,0 +1,736 @@
+/*
+ * (C) Copyright 2002
+ * 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] = {
+        {0xffc00000, 0xffe00000, 0xff880000},   /* 0:000: configuraton 3 */
+        {0xffc00000, 0xffe00000, 0xff800000},   /* 1:001: configuraton 4 */
+        {0xffc00000, 0xffe00000, 0x00000000},   /* 2:010: configuraton 7 */
+        {0xffc00000, 0xffe00000, 0x00000000},   /* 3:011: configuraton 8 */
+        {0xff800000, 0xffa00000, 0xfff80000},   /* 4:100: configuraton 1 */
+        {0xff800000, 0xffa00000, 0xfff00000},   /* 5:101: configuraton 2 */
+        {0xffc00000, 0xffe00000, 0x00000000},   /* 6:110: configuraton 5 */
+        {0xffc00000, 0xffe00000, 0x00000000}    /* 7:111: configuraton 6 */
+};
+
+/*-----------------------------------------------------------------------
+ * 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);
+#if 0
+static void flash_get_offsets (ulong base, flash_info_t *info);
+#endif
+
+#ifdef CONFIG_ADCIOP
+#define ADDR0           0x0aa9
+#define ADDR1           0x0556
+#define FLASH_WORD_SIZE unsigned char
+#endif
+
+#ifdef CONFIG_CPCI405
+#define ADDR0           0x5555
+#define ADDR1           0x2aaa
+#define FLASH_WORD_SIZE unsigned short
+#endif
+
+#ifdef CONFIG_WALNUT405
+#define ADDR0           0x5555
+#define ADDR1           0x2aaa
+#define FLASH_WORD_SIZE unsigned char
+#endif
+
+#ifdef CONFIG_EBONY
+#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;
+}
+
+
+
+/*-----------------------------------------------------------------------
+ */
+#if 0
+static void flash_get_offsets (ulong base, flash_info_t *info)
+{
+	int i;
+
+	/* 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;
+			}
+		}
+	}
+}
+#endif /* 0 */
+
+/*-----------------------------------------------------------------------
+ */
+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_AMD016:	printf ("AM29F016D (16 Mbit, uniform sector size)\n");
+		break;
+	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_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);
+
+#ifdef CONFIG_ADCIOP
+			value = addr2[2];
+#else
+			value = addr2[0];
+#endif
+
+			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;
+			default:
+				info->flash_id = FLASH_UNKNOWN;
+				info->sector_count = 0;
+				info->size = 0;
+				return (0);			/* no or unknown flash	*/
+			}
+
+#ifdef CONFIG_ADCIOP
+			value = addr2[0];			/* device ID		*/
+			debug ("\ndev_code=%x\n", value);
+#else
+			value = addr2[1];			/* device ID		*/
+#endif
+
+			DEBUGF("\nFLASH DEVICEID: %x\n", value);
+
+			switch (value) {
+			case (FLASH_WORD_SIZE)AMD_ID_F016D:
+				info->flash_id += FLASH_AMD016;
+				info->sector_count = 32;
+				info->size = 0x00200000;
+				break;				/* => 2 MB		*/
+			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_LV400T:
+				info->flash_id += FLASH_AM400T;
+				info->sector_count = 11;
+				info->size = 0x00080000;
+				break;				/* => 0.5 MB		*/
+
+			case (FLASH_WORD_SIZE)AMD_ID_LV400B:
+				info->flash_id += FLASH_AM400B;
+				info->sector_count = 11;
+				info->size = 0x00080000;
+				break;				/* => 0.5 MB		*/
+
+			case (FLASH_WORD_SIZE)AMD_ID_LV800T:
+				info->flash_id += FLASH_AM800T;
+				info->sector_count = 19;
+				info->size = 0x00100000;
+				break;				/* => 1 MB		*/
+
+			case (FLASH_WORD_SIZE)AMD_ID_LV800B:
+				info->flash_id += FLASH_AM800B;
+				info->sector_count = 19;
+				info->size = 0x00100000;
+				break;				/* => 1 MB		*/
+
+			case (FLASH_WORD_SIZE)AMD_ID_LV160T:
+				info->flash_id += FLASH_AM160T;
+				info->sector_count = 35;
+				info->size = 0x00200000;
+				break;				/* => 2 MB		*/
+
+			case (FLASH_WORD_SIZE)AMD_ID_LV160B:
+				info->flash_id += FLASH_AM160B;
+				info->sector_count = 35;
+				info->size = 0x00200000;
+				break;				/* => 2 MB		*/
+#if 0	/* enable when device IDs are available */
+			case (FLASH_WORD_SIZE)AMD_ID_LV320T:
+				info->flash_id += FLASH_AM320T;
+				info->sector_count = 67;
+				info->size = 0x00400000;
+				break;				/* => 4 MB		*/
+
+			case (FLASH_WORD_SIZE)AMD_ID_LV320B:
+				info->flash_id += FLASH_AM320B;
+				info->sector_count = 67;
+				info->size = 0x00400000;
+				break;				/* => 4 MB		*/
+#endif
+			case (FLASH_WORD_SIZE)SST_ID_xF800A:
+				info->flash_id += FLASH_SST800A;
+				info->sector_count = 16;
+				info->size = 0x00100000;
+				break;				/* => 1 MB		*/
+
+			case (FLASH_WORD_SIZE)SST_ID_xF160A:
+				info->flash_id += FLASH_SST160A;
+				info->sector_count = 32;
+				info->size = 0x00200000;
+				break;				/* => 2 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 */
+#ifdef CONFIG_ADCIOP
+				addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
+				info->protect[i] = addr2[4] & 1;
+#else
+				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;
+#endif
+			}
+
+			/*
+			 * Prevent writes to uninitialized FLASH.
+			 */
+			if (info->flash_id != FLASH_UNKNOWN) {
+#if 0 /* test-only */
+#ifdef CONFIG_ADCIOP
+				addr2 = (volatile unsigned char *)info->start[0];
+				addr2[ADDR0] = 0xAA;
+				addr2[ADDR1] = 0x55;
+				addr2[ADDR0] = 0xF0;  /* reset bank */
+#else
+				addr2 = (FLASH_WORD_SIZE *)info->start[0];
+				*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
+#endif
+#else /* test-only */
+				addr2 = (FLASH_WORD_SIZE *)info->start[0];
+				*addr2 = (FLASH_WORD_SIZE)0x00F000F0;	/* reset bank */
+#endif /* test-only */
+			}
+
+			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);
+
+#if 0
+			/*
+			 * We wait for the last triggered sector
+			 */
+			if (l_sect < 0)
+				goto DONE;
+			wait_for_DQ7(info, l_sect);
+
+		DONE:
+#endif
+			/* 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);
+		}
+
+/*-----------------------------------------------------------------------
+ */