init commit via android 4.4 uboot

1 files changed, 797 insertions, 0 deletions

diff --git a/board/svm_sc8xx/flash.c b/board/svm_sc8xx/flash.c
new file mode 100755
index 0000000..25e61dd
--- /dev/null
+++ b/board/svm_sc8xx/flash.c
@@ -0,0 +1,797 @@
+/*
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+
+#ifndef	CFG_ENV_ADDR
+#define CFG_ENV_ADDR	(CFG_FLASH_BASE + CFG_ENV_OFFSET)
+#endif
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data);
+#if 0
+static ulong flash_get_size (vu_long *addr, flash_info_t *info);
+static void flash_get_offsets (ulong base, flash_info_t *info);
+#endif
+#ifdef  CONFIG_BOOT_8B
+static int my_in_8( unsigned char *addr);
+static  void my_out_8( unsigned char *addr, int val);
+#endif
+#ifdef  CONFIG_BOOT_16B
+static  int my_in_be16( unsigned short *addr);
+static  void my_out_be16( unsigned short *addr, int val);
+#endif
+#ifdef  CONFIG_BOOT_32B
+static  unsigned my_in_be32( unsigned *addr);
+static  void my_out_be32( unsigned *addr, int val);
+#endif
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long flash_init (void)
+{
+	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	unsigned long size_b0, size_b1;
+	int i;
+
+	size_b0=0;
+	size_b1=0;
+	/* Init: no FLASHes known */
+	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+		flash_info[i].flash_id = FLASH_UNKNOWN;
+	}
+#ifdef CFG_DOC_BASE
+#ifndef CONFIG_FEL8xx_AT
+	memctl->memc_or5 = (0xffff8000 | CFG_OR_TIMING_DOC ); /* 32k bytes */
+	memctl->memc_br5 = CFG_DOC_BASE | 0x401;
+#else
+	memctl->memc_or3 = (0xffff8000 | CFG_OR_TIMING_DOC ); /* 32k bytes */
+	memctl->memc_br3 = CFG_DOC_BASE | 0x401;
+#endif
+#endif
+#if defined( CONFIG_BOOT_8B)
+/*        memctl->memc_or0 = 0xfff80ff4; /###* 4MB bytes */
+/*        memctl->memc_br0 = 0x40000401; */
+	size_b0 = 0x80000;  /* 512 K */
+	flash_info[0].flash_id = FLASH_MAN_AMD | FLASH_AM040;
+	flash_info[0].sector_count = 8;
+	flash_info[0].size = 0x00080000;
+	/* set up sector start address table */
+	for (i = 0; i < flash_info[0].sector_count; i++)
+	flash_info[0].start[i] = 0x40000000 + (i * 0x10000);
+	/* protect all sectors */
+	for (i = 0; i < flash_info[0].sector_count; i++)
+	flash_info[0].protect[i] = 0x1;
+#elif defined (CONFIG_BOOT_16B)
+/*        memctl->memc_or0 = 0xfff80ff4; /###* 4MB bytes */
+/*        memctl->memc_br0 = 0x40000401; */
+	size_b0 = 0x400000;  /* 4MB , assume AMD29LV320B */
+	flash_info[0].flash_id = FLASH_MAN_AMD | FLASH_AM320B;
+	flash_info[0].sector_count = 67;
+	flash_info[0].size = 0x00400000;
+	/* set up sector start address table */
+	flash_info[0].start[0] = 0x40000000  ;
+	flash_info[0].start[1] = 0x40000000 + 0x4000;
+	flash_info[0].start[2] = 0x40000000 + 0x6000;
+	flash_info[0].start[3] = 0x40000000 + 0x8000;
+	for (i = 4; i < flash_info[0].sector_count; i++)
+	flash_info[0].start[i] = 0x40000000 + 0x10000 + ((i-4) * 0x10000);
+	/* protect all sectors */
+	for (i = 0; i < flash_info[0].sector_count; i++)
+	flash_info[0].protect[i] = 0x1;
+#endif
+
+
+#ifdef CONFIG_BOOT_32B
+
+	/* Static FLASH Bank configuration here - FIXME XXX */
+
+	size_b0 = 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_b0, size_b0<<20);
+	}
+
+	size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
+
+	if (size_b1 > size_b0) {
+		printf ("## ERROR: "
+			"Bank 1 (0x%08lx = %ld MB) > Bank 0 (0x%08lx = %ld MB)\n",
+			size_b1, size_b1<<20,
+			size_b0, size_b0<<20
+		);
+		flash_info[0].flash_id	= FLASH_UNKNOWN;
+		flash_info[1].flash_id	= FLASH_UNKNOWN;
+		flash_info[0].sector_count	= -1;
+		flash_info[1].sector_count	= -1;
+		flash_info[0].size		= 0;
+		flash_info[1].size		= 0;
+		return (0);
+	}
+
+	/* Remap FLASH according to real size */
+	memctl->memc_or0 = CFG_OR_TIMING_FLASH | (-size_b0 & OR_AM_MSK);
+	memctl->memc_br0 = (CFG_FLASH_BASE & BR_BA_MSK) | BR_MS_GPCM | BR_V;
+
+	/* Re-do sizing to get full correct info */
+	size_b0 = flash_get_size((vu_long *)CFG_FLASH_BASE, &flash_info[0]);
+
+	flash_get_offsets (CFG_FLASH_BASE, &flash_info[0]);
+
+#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
+	/* monitor protection ON by default */
+	flash_protect(FLAG_PROTECT_SET,
+		      CFG_MONITOR_BASE,
+		      CFG_MONITOR_BASE+monitor_flash_len-1,
+		      &flash_info[0]);
+#endif
+
+#ifdef	CFG_ENV_IS_IN_FLASH
+	/* ENV protection ON by default */
+	flash_protect(FLAG_PROTECT_SET,
+		      CFG_ENV_ADDR,
+		      CFG_ENV_ADDR+CFG_ENV_SIZE-1,
+		      &flash_info[0]);
+#endif
+
+	if (size_b1) {
+		memctl->memc_or1 = CFG_OR_TIMING_FLASH | (-size_b1 & 0xFFFF8000);
+		memctl->memc_br1 = ((CFG_FLASH_BASE + size_b0) & BR_BA_MSK) |
+				    BR_MS_GPCM | BR_V;
+
+		/* Re-do sizing to get full correct info */
+		size_b1 = flash_get_size((vu_long *)(CFG_FLASH_BASE + size_b0),
+					  &flash_info[1]);
+
+		flash_get_offsets (CFG_FLASH_BASE + size_b0, &flash_info[1]);
+
+#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
+		/* monitor protection ON by default */
+		flash_protect(FLAG_PROTECT_SET,
+			      CFG_MONITOR_BASE,
+			      CFG_MONITOR_BASE+monitor_flash_len-1,
+			      &flash_info[1]);
+#endif
+
+#ifdef	CFG_ENV_IS_IN_FLASH
+		/* ENV protection ON by default */
+		flash_protect(FLAG_PROTECT_SET,
+			      CFG_ENV_ADDR,
+			      CFG_ENV_ADDR+CFG_ENV_SIZE-1,
+			      &flash_info[1]);
+#endif
+	} else {
+		memctl->memc_br1 = 0;		/* invalidate bank */
+
+		flash_info[1].flash_id = FLASH_UNKNOWN;
+		flash_info[1].sector_count = -1;
+	}
+
+	flash_info[0].size = size_b0;
+	flash_info[1].size = size_b1;
+
+
+#endif  /* CONFIG_BOOT_32B */
+
+	return (size_b0 + size_b1);
+}
+#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_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;
+		}
+	}
+}
+#endif
+/*-----------------------------------------------------------------------
+ */
+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;
+	default:		printf ("Unknown Vendor ");	break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	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");
+	return;
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+
+/*-----------------------------------------------------------------------
+ */
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+#if 0
+static ulong flash_get_size (vu_long *addr, flash_info_t *info)
+{
+	short i;
+	ulong value;
+	ulong base = (ulong)addr;
+
+	/* Write auto select command: read Manufacturer ID */
+	addr[0x0555] = 0x00AA00AA;
+	addr[0x02AA] = 0x00550055;
+	addr[0x0555] = 0x00900090;
+
+	value = addr[0];
+
+	switch (value) {
+	case AMD_MANUFACT:
+		info->flash_id = FLASH_MAN_AMD;
+		break;
+	case FUJ_MANUFACT:
+		info->flash_id = FLASH_MAN_FUJ;
+		break;
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		info->sector_count = 0;
+		info->size = 0;
+		return (0);			/* no or unknown flash	*/
+	}
+
+	value = addr[1];			/* device ID		*/
+
+	switch (value) {
+	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		*/
+#if 0	/* enable when device IDs are available */
+	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
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		return (0);			/* => no or unknown flash */
+	}
+
+	/* 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;
+		}
+	}
+
+	/* 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;
+	}
+
+	/*
+	 * Prevent writes to uninitialized FLASH.
+	 */
+	if (info->flash_id != FLASH_UNKNOWN) {
+		addr = (volatile unsigned long *)info->start[0];
+
+		*addr = 0x00F000F0;	/* reset bank */
+	}
+
+	return (info->size);
+}
+#endif
+
+/*-----------------------------------------------------------------------
+ */
+
+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,in_mid,in_did;
+	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();
+#if defined (CONFIG_BOOT_8B )
+	my_out_8( (unsigned char * )  ((ulong)addr+0x555) , 0xaa );
+	my_out_8( (unsigned char * )  ((ulong)addr+0x2aa) , 0x55 );
+	my_out_8( (unsigned char * )  ((ulong)addr+0x555) , 0x90 );
+	in_mid=my_in_8( (unsigned char * ) addr );
+	in_did=my_in_8( (unsigned char * ) ((ulong)addr+1) );
+	printf(" man ID=0x%x, dev ID=0x%x.\n",in_mid,in_did );
+	my_out_8( (unsigned char *)addr, 0xf0);
+	udelay(1);
+	my_out_8(     (unsigned char *) ((ulong)addr+0x555),0xaa );
+	my_out_8(     (unsigned char *) ((ulong)addr+0x2aa),0x55 );
+	my_out_8(     (unsigned char *) ((ulong)addr+0x555),0x80 );
+	my_out_8(     (unsigned char *) ((ulong)addr+0x555),0xaa );
+	my_out_8(     (unsigned char *) ((ulong)addr+0x2aa),0x55 );
+	/* 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] = 0x00300030; */
+			my_out_8(     (unsigned char *) ((ulong)addr),0x30 );
+			l_sect = sect;
+		}
+	}
+#elif defined(CONFIG_BOOT_16B )
+	my_out_be16( (unsigned short * )  ((ulong)addr+ (0xaaa)) , 0xaa );
+	my_out_be16( (unsigned short * )  ((ulong)addr+ (0x554)) , 0x55 );
+	my_out_be16( (unsigned short * )  ((ulong)addr+ (0xaaa)) , 0x90 );
+	in_mid=my_in_be16( (unsigned short * ) addr );
+	in_did=my_in_be16 ( (unsigned short * ) ((ulong)addr+2) );
+	printf(" man ID=0x%x, dev ID=0x%x.\n",in_mid,in_did );
+	my_out_be16( (unsigned short *)addr, 0xf0);
+	udelay(1);
+	my_out_be16(     (unsigned short *) ((ulong)addr+ 0xaaa),0xaa );
+	my_out_be16(     (unsigned short *) ((ulong)addr+0x554),0x55 );
+	my_out_be16(     (unsigned short *) ((ulong)addr+0xaaa),0x80 );
+	my_out_be16(     (unsigned short *) ((ulong)addr+0xaaa),0xaa );
+	my_out_be16(     (unsigned short *) ((ulong)addr+0x554),0x55 );
+	/* 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]);
+			my_out_be16(     (unsigned short *) ((ulong)addr),0x30 );
+			l_sect = sect;
+		}
+	}
+
+#elif defined(CONFIG_BOOT_32B)
+	my_out_be32( (unsigned * )  ((ulong)addr+0x1554) , 0xaa );
+	my_out_be32( (unsigned * )  ((ulong)addr+0xaa8) , 0x55 );
+	my_out_be32( (unsigned  *)  ((ulong)addr+0x1554) , 0x90 );
+	in_mid=my_in_be32( (unsigned  * ) addr );
+	in_did=my_in_be32( (unsigned  * ) ((ulong)addr+4) );
+	printf(" man ID=0x%x, dev ID=0x%x.\n",in_mid,in_did );
+	my_out_be32( (unsigned *)addr, 0xf0);
+	udelay(1);
+	my_out_be32(     (unsigned  *) ((ulong)addr+0x1554),0xaa );
+	my_out_be32(     (unsigned  *) ((ulong)addr+0xaa8),0x55 );
+	my_out_be32(     (unsigned  *) ((ulong)addr+0x1554),0x80 );
+	my_out_be32(     (unsigned  *) ((ulong)addr+0x1554),0xaa );
+	my_out_be32(     (unsigned  *) ((ulong)addr+0xaa8),0x55 );
+	/* 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]);
+			my_out_be32(     (unsigned *) ((ulong)addr),0x00300030 );
+			l_sect = sect;
+		}
+	}
+
+#else
+# error CONFIG_BOOT_(size)B missing.
+#endif
+	/* 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]);
+#if defined (CONFIG_BOOT_8B)
+	while (  (my_in_8((unsigned char *)addr) & 0x80) != 0x80 )
+#elif defined(CONFIG_BOOT_16B )
+	while (  (my_in_be16((unsigned short *)addr) & 0x0080) != 0x0080 )
+#elif defined(CONFIG_BOOT_32B)
+	while (  (my_in_be32((unsigned  *)addr) & 0x00800080) != 0x00800080 )
+#else
+# error CONFIG_BOOT_(size)B missing.
+#endif
+	{
+		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;
+		}
+	}
+DONE:
+	/* reset to read mode */
+	addr = (volatile unsigned long *)info->start[0];
+#if defined (CONFIG_BOOT_8B)
+	my_out_8( (unsigned char *)addr, 0xf0);
+#elif defined(CONFIG_BOOT_16B )
+	my_out_be16( (unsigned short * ) addr , 0x00f0 );
+#elif defined(CONFIG_BOOT_32B)
+	my_out_be32 ( (unsigned *)addr,  0x00F000F0 );	/* reset bank */
+#else
+# error CONFIG_BOOT_(size)B missing.
+#endif
+	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)
+{
+	ulong addr = (ulong)(info->start[0]);
+	ulong start,last;
+	int flag;
+	ulong i;
+	int  data_short[2];
+
+	/* Check if Flash is (sufficiently) erased */
+	if ( ((ulong)  *(ulong *)dest & data) != data ) {
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+#if defined(CONFIG_BOOT_8B)
+#ifdef DEBUG
+	{
+	int in_mid,in_did;
+	my_out_8( (unsigned char * )  (addr+0x555) , 0xaa );
+	my_out_8( (unsigned char * )  (addr+0x2aa) , 0x55 );
+	my_out_8( (unsigned char * )  (addr+0x555) , 0x90 );
+	in_mid=my_in_8( (unsigned char * ) addr );
+	in_did=my_in_8( (unsigned char * ) (addr+1) );
+	printf(" man ID=0x%x, dev ID=0x%x.\n",in_mid,in_did );
+	my_out_8( (unsigned char *)addr, 0xf0);
+	udelay(1);
+	}
+#endif
+      {
+	int  data_ch[4];
+	data_ch[0]=(int ) ((data>>24) & 0xff);
+	data_ch[1]=(int ) ((data>>16) &0xff );
+	data_ch[2]=(int ) ((data >>8) & 0xff);
+	data_ch[3]=(int ) (data & 0xff);
+	for (i=0;i<4;i++ ){
+	  my_out_8( (unsigned char *) (addr+0x555),0xaa);
+	  my_out_8((unsigned char *) (addr+0x2aa),0x55);
+	  my_out_8( (unsigned char *)  (addr+0x555),0xa0);
+	  my_out_8((unsigned char *)  (dest+i) ,data_ch[i]);
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	  start = get_timer (0);
+	last  = start;
+	  while(  ( my_in_8((unsigned char *) (dest+i)) ) != ( data_ch[i]  ) ) {
+		  if (get_timer(start) > CFG_FLASH_WRITE_TOUT ) {
+			  return 1;
+		  }
+	  }
+	}/* for */
+     }
+#elif defined( CONFIG_BOOT_16B)
+	data_short[0]=(int) (data>>16) & 0xffff;
+	data_short[1]=(int ) data & 0xffff ;
+	for (i=0;i<2;i++ ){
+	my_out_be16(     (unsigned short *) ((ulong)addr+ 0xaaa),0xaa );
+	my_out_be16(     (unsigned short *) ((ulong)addr+ 0x554),0x55 );
+	my_out_be16(     (unsigned short *) ((ulong)addr+ 0xaaa),0xa0 );
+	my_out_be16(  (unsigned short *) (dest+(i*2)) ,data_short[i]);
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+	  start = get_timer (0);
+	last  = start;
+	  while(  ( my_in_be16((unsigned short *) (dest+(i*2))) ) != ( data_short[i]  ) ) {
+		  if (get_timer(start) > CFG_FLASH_WRITE_TOUT ) {
+			  return 1;
+		  }
+	  }
+	}
+#elif defined( CONFIG_BOOT_32B)
+	addr[0x0555] = 0x00AA00AA;
+	addr[0x02AA] = 0x00550055;
+	addr[0x0555] = 0x00A000A0;
+
+	*((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) & 0x00800080) != (data & 0x00800080)) {
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			return (1);
+		}
+	}
+#endif
+
+
+	return (0);
+}
+#ifdef  CONFIG_BOOT_8B
+static int my_in_8  ( unsigned char *addr)
+{
+       int ret;
+       __asm__ __volatile__("lbz%U1%X1 %0,%1; eieio" : "=r" (ret) : "m" (*addr));
+       return ret;
+}
+
+static void my_out_8  ( unsigned char *addr, int val)
+{
+       __asm__ __volatile__("stb%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
+}
+#endif
+#ifdef  CONFIG_BOOT_16B
+static int my_in_be16( unsigned short *addr)
+{
+       int ret;
+	__asm__ __volatile__("lhz%U1%X1 %0,%1; eieio" : "=r" (ret) : "m" (*addr));
+				return ret;
+}
+static void my_out_be16( unsigned short *addr, int val)
+{
+       __asm__ __volatile__("sth%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
+}
+#endif
+#ifdef  CONFIG_BOOT_32B
+static  unsigned my_in_be32( unsigned *addr)
+{
+	unsigned ret;
+	__asm__ __volatile__("lwz%U1%X1 %0,%1; eieio" : "=r" (ret) : "m" (*addr));
+				return ret;
+}
+static  void my_out_be32( unsigned *addr, int val)
+{
+       __asm__ __volatile__("stw%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
+}
+#endif