Initial revision

3 files changed, 766 insertions, 0 deletions

diff --git a/board/RPXClassic/RPXClassic.c b/board/RPXClassic/RPXClassic.c
new file mode 100644
index 00000000000..4d2100b4d6d
--- /dev/null
+++ b/board/RPXClassic/RPXClassic.c
@@ -0,0 +1,290 @@
+/*
+ * (C)	Copyright 2001
+ * Stäubli Faverges - <www.staubli.com>
+ * Pierre AUBERT  p.aubert@staubli.com
+ * U-Boot port on RPXClassic LF (CLLF_BW31) board
+ *
+ * (C) Copyright 2000
+ * 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 <i2c.h>
+#include <config.h>
+#include <mpc8xx.h>
+
+/* ------------------------------------------------------------------------- */
+
+static long int dram_size (long int, long int *, long int);
+static unsigned char aschex_to_byte (unsigned char *cp);
+
+/* ------------------------------------------------------------------------- */
+
+#define _NOT_USED_	0xFFFFCC25
+
+const uint sdram_table[] =
+{
+	/*
+	 * Single Read. (Offset 00h in UPMA RAM)
+	 */
+	0xCFFFCC24, 0x0FFFCC04, 0X0CAFCC04, 0X03AFCC08,
+	0x3FBFCC27, /* last */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_,
+
+	/*
+	 * Burst Read. (Offset 08h in UPMA RAM)
+	 */
+	0xCFFFCC24, 0x0FFFCC04, 0x0CAFCC84, 0x03AFCC88,
+	0x3FBFCC27, /* last */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_,
+
+	/*
+	 * Single Write. (Offset 18h in UPMA RAM)
+	 */
+	0xCFFFCC24, 0x0FFFCC04, 0x0CFFCC04, 0x03FFCC00,
+	0x3FFFCC27, /* last */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_,
+
+	/*
+	 * Burst Write. (Offset 20h in UPMA RAM)
+	 */
+	0xCFFFCC24, 0x0FFFCC04, 0x0CFFCC80, 0x03FFCC8C,
+	0x0CFFCC00, 0x33FFCC27, /* last */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_,
+
+	/*
+	 * Refresh. (Offset 30h in UPMA RAM)
+	 */
+	0xC0FFCC24, 0x03FFCC24, 0x0FFFCC24, 0x0FFFCC24,
+	0x3FFFCC27, /* last */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_,
+
+	/*
+	 * Exception. (Offset 3Ch in UPMA RAM)
+	 */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_
+};
+
+/* ------------------------------------------------------------------------- */
+
+
+/*
+ * Check Board Identity:
+ */
+
+int checkboard (void)
+{
+	puts ("Board: RPXClassic\n");
+	return (0);
+}
+
+/*-----------------------------------------------------------------------------
+ * board_get_enetaddr -- Read the MAC Address in the I2C EEPROM
+ *-----------------------------------------------------------------------------
+ */
+void board_get_enetaddr (uchar * enet)
+{
+	int i;
+	char buff[256], *cp;
+
+	/* Initialize I2C					*/
+	i2c_init (CFG_I2C_SPEED, CFG_I2C_SLAVE);
+
+	/* Read 256 bytes in EEPROM				*/
+	i2c_read (0x54, 0, 1, buff, 128);
+	i2c_read (0x54, 128, 1, buff + 128, 128);
+
+	/* Retrieve MAC address in buffer (key EA)		*/
+	for (cp = buff;;) {
+		if (cp[0] == 'E' && cp[1] == 'A') {
+			cp += 3;
+			/* Read MAC address			*/
+			for (i = 0; i < 6; i++, cp += 2) {
+				enet[i] = aschex_to_byte (cp);
+			}
+		}
+		/* Scan to the end of the record		*/
+		while ((*cp != '\n') && (*cp != 0xff)) {
+			cp++;
+		}
+		/* If the next character is a \n, 0 or ff, we are done.	*/
+		cp++;
+		if ((*cp == '\n') || (*cp == 0) || (*cp == 0xff))
+			break;
+	}
+
+#ifdef CONFIG_FEC_ENET
+	/* The MAC address is the same as normal ethernet except the 3rd byte	 */
+	/* (See the E.P. Planet Core Overview manual		*/
+	enet[3] |= 0x80;
+
+	/* Validate the fast ethernet tranceiver		*/
+	*((volatile uchar *) BCSR2) &= ~BCSR2_MIICTL;
+	*((volatile uchar *) BCSR2) &= ~BCSR2_MIIPWRDWN;
+	*((volatile uchar *) BCSR2) |= BCSR2_MIIRST;
+	*((volatile uchar *) BCSR2) |= BCSR2_MIIPWRDWN;
+#endif
+
+	printf ("MAC address = %02x:%02x:%02x:%02x:%02x:%02x\n",
+		enet[0], enet[1], enet[2], enet[3], enet[4], enet[5]);
+
+}
+
+void rpxclassic_init (void)
+{
+	/* Enable NVRAM */
+	*((uchar *) BCSR0) |= BCSR0_ENNVRAM;
+
+}
+
+/* ------------------------------------------------------------------------- */
+
+long int initdram (int board_type)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	long int size10;
+
+	upmconfig (UPMA, (uint *) sdram_table,
+			   sizeof (sdram_table) / sizeof (uint));
+
+	/* Refresh clock prescalar */
+	memctl->memc_mptpr = CFG_MPTPR;
+
+	memctl->memc_mar = 0x00000000;
+
+	/* Map controller banks 1 to the SDRAM bank */
+	memctl->memc_or1 = CFG_OR1_PRELIM;
+	memctl->memc_br1 = CFG_BR1_PRELIM;
+
+	memctl->memc_mamr = CFG_MAMR_10COL & (~(MAMR_PTAE));	/* no refresh yet */
+
+	udelay (200);
+
+	/* perform SDRAM initializsation sequence */
+
+	memctl->memc_mcr = 0x80002230;	/* SDRAM bank 0 - refresh twice */
+	udelay (1);
+
+	memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
+
+	udelay (1000);
+
+	/* Check Bank 0 Memory Size
+	 * try 10 column mode
+	 */
+
+	size10 = dram_size (CFG_MAMR_10COL, (ulong *) SDRAM_BASE_PRELIM,
+						SDRAM_MAX_SIZE);
+
+	return (size10);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Check memory range for valid RAM. A simple memory test determines
+ * the actually available RAM size between addresses `base' and
+ * `base + maxsize'. Some (not all) hardware errors are detected:
+ * - short between address lines
+ * - short between data lines
+ */
+
+static long int dram_size (long int mamr_value, long int *base, long int maxsize)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	volatile long int *addr;
+	ulong cnt, val;
+	ulong save[32];			/* to make test non-destructive */
+	unsigned char i = 0;
+
+	memctl->memc_mamr = mamr_value;
+
+	for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
+		addr = base + cnt;	/* pointer arith! */
+
+		save[i++] = *addr;
+		*addr = ~cnt;
+	}
+
+	/* write 0 to base address */
+	addr = base;
+	save[i] = *addr;
+	*addr = 0;
+
+	/* check at base address */
+	if ((val = *addr) != 0) {
+		*addr = save[i];
+		return (0);
+	}
+
+	for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
+		addr = base + cnt;		/* pointer arith! */
+
+		val = *addr;
+		*addr = save[--i];
+
+		if (val != (~cnt)) {
+			return (cnt * sizeof (long));
+		}
+	}
+	return (maxsize);
+}
+static unsigned char aschex_to_byte (unsigned char *cp)
+{
+	u_char byte, c;
+
+	c = *cp++;
+
+	if ((c >= 'A') && (c <= 'F')) {
+		c -= 'A';
+		c += 10;
+	} else if ((c >= 'a') && (c <= 'f')) {
+		c -= 'a';
+		c += 10;
+	} else {
+		c -= '0';
+	}
+
+	byte = c * 16;
+
+	c = *cp;
+
+	if ((c >= 'A') && (c <= 'F')) {
+		c -= 'A';
+		c += 10;
+	} else if ((c >= 'a') && (c <= 'f')) {
+		c -= 'a';
+		c += 10;
+	} else {
+		c -= '0';
+	}
+
+	byte += c;
+
+	return (byte);
+}
diff --git a/board/RPXClassic/config.mk b/board/RPXClassic/config.mk
new file mode 100644
index 00000000000..ae455e1202b
--- /dev/null
+++ b/board/RPXClassic/config.mk
@@ -0,0 +1,29 @@
+#
+# (C)  Copyright 2001
+# Stäubli Faverges - <www.staubli.com>
+# Pierre AUBERT  p.aubert@staubli.com
+# U-Boot port on RPXClassic LF (CLLF_BW31) board
+#
+# (C) Copyright 2000
+# 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
+#
+
+TEXT_BASE = 0xff000000
diff --git a/board/RPXClassic/flash.c b/board/RPXClassic/flash.c
new file mode 100644
index 00000000000..62934975fef
--- /dev/null
+++ b/board/RPXClassic/flash.c
@@ -0,0 +1,447 @@
+/*
+ * (C)  Copyright 2001
+ * Stäubli Faverges - <www.staubli.com>
+ * Pierre AUBERT  p.aubert@staubli.com
+ * U-Boot port on RPXClassic LF (CLLF_BW31) board
+ *
+ * RPXClassic uses Am29DL323B flash memory with 2 banks
+ *
+ *
+ * (C) Copyright 2000
+ * 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>
+
+flash_info_t	flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips	*/
+
+/*-----------------------------------------------------------------------
+ * 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);
+static void flash_get_offsets (ulong base, flash_info_t *info);
+
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long flash_init (void)
+{
+	unsigned long size_b0 ;
+	int i;
+
+	/* Init: no FLASHes known */
+	for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+		flash_info[i].flash_id = FLASH_UNKNOWN;
+	}
+
+	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+CFG_MONITOR_LEN-1,
+		      &flash_info[0]);
+#endif
+
+	flash_info[0].size = size_b0;
+
+	return (size_b0);
+}
+
+/*-----------------------------------------------------------------------
+ */
+static void flash_get_offsets (ulong base, flash_info_t *info)
+{
+	int i;
+
+	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 + 0x00010000;
+		info->start[3] = base + 0x00018000;
+		info->start[4] = base + 0x00020000;
+		info->start[5] = base + 0x00028000;
+		info->start[6] = base + 0x00030000;
+		info->start[7] = base + 0x00038000;
+		for (i = 8; i < info->sector_count; i++) {
+			info->start[i] = base + ((i-7) * 0x00040000) ;
+		}
+	}
+}
+
+/*-----------------------------------------------------------------------
+ */
+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;
+	default:		printf ("Unknown Vendor ");	break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+        case FLASH_AMDL323B:
+            printf ("AMDL323DB (16 Mbytes, bottom boot sect)\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;
+	ulong value;
+	ulong base = (ulong)addr;
+
+        /* Reset flash componeny                                             */
+        addr [0] = 0xf0f0f0f0;
+
+        /* Write auto select command: read Manufacturer ID */
+        addr[0xAAA] = 0xAAAAAAAA ;
+	addr[0x555] = 0x55555555 ;
+	addr[0xAAA] = 0x90909090 ;
+
+	value = addr[0] ;
+
+	switch (value & 0x00FF00FF) {
+	case AMD_MANUFACT:
+		info->flash_id = FLASH_MAN_AMD;
+		break;
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		info->sector_count = 0;
+		info->size = 0;
+		return (0);			/* no or unknown flash	*/
+	}
+
+	value = addr[2] ;		/* device ID		*/
+
+	switch (value & 0x00FF00FF) {
+        case (AMD_ID_DL323B & 0x00FF00FF):
+            info->flash_id += FLASH_AMDL323B;
+            info->sector_count = 71;
+            info->size = 0x01000000;            /* 16 Mb                     */
+
+            break;
+	default:
+		info->flash_id = FLASH_UNKNOWN;
+		return (0);			/* => no or unknown flash */
+
+	}
+	/* set up sector start address table */
+        /* set sector offsets for bottom boot block type	*/
+        info->start[0] = base + 0x00000000;
+        info->start[1] = base + 0x00008000;
+        info->start[2] = base + 0x00010000;
+        info->start[3] = base + 0x00018000;
+        info->start[4] = base + 0x00020000;
+        info->start[5] = base + 0x00028000;
+        info->start[6] = base + 0x00030000;
+        info->start[7] = base + 0x00038000;
+        for (i = 8; i < info->sector_count; i++) {
+            info->start[i] = base + ((i-7) * 0x00040000) ;
+        }
+
+	/* check for protected sectors */
+        for (i = 0; i < 23; 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[4] & 1 ;
+	}
+        /* Check for protected sectors in the 2nd bank                       */
+        addr[0x100AAA] = 0xAAAAAAAA ;
+        addr[0x100555] = 0x55555555 ;
+        addr[0x100AAA] = 0x90909090 ;
+
+        for (i = 23; 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[4] & 1 ;
+	}
+
+	/*
+	 * Prevent writes to uninitialized FLASH.
+	 */
+	if (info->flash_id != FLASH_UNKNOWN) {
+		addr = (volatile unsigned long *)info->start[0];
+
+		*addr = 0xF0F0F0F0;	/* reset bank 1                      */
+		addr = (volatile unsigned long *)info->start[23];
+
+		*addr = 0xF0F0F0F0;	/* reset bank 2                      */
+
+	}
+
+	return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ */
+
+int	flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+	vu_long *addr = (vu_long*)(info->start[0]);
+	int flag, prot, sect, l_sect;
+	ulong start, now, last;
+
+	if ((s_first < 0) || (s_first > s_last)) {
+		if (info->flash_id == FLASH_UNKNOWN) {
+			printf ("- missing\n");
+		} else {
+			printf ("- no sectors to erase\n");
+		}
+		return 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[0xAAA] = 0xAAAAAAAA;
+	addr[0x555] = 0x55555555;
+	addr[0xAAA] = 0x80808080;
+	addr[0xAAA] = 0xAAAAAAAA;
+	addr[0x555] = 0x55555555;
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect<=s_last; sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			addr = (vu_long *)(info->start[sect]) ;
+			addr[0] = 0x30303030 ;
+			l_sect = sect;
+		}
+	}
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* wait at least 80us - let's wait 1 ms */
+	udelay (1000);
+
+	/*
+	 * We wait for the last triggered sector
+	 */
+	if (l_sect < 0)
+		goto DONE;
+
+	start = get_timer (0);
+	last  = start;
+	addr = (vu_long *)(info->start[l_sect]);
+	while ((addr[0] & 0x80808080) != 0x80808080) {
+		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 = (vu_long *)info->start[0];
+	addr[0] = 0xF0F0F0F0;	/* reset bank */
+
+	printf (" done\n");
+        return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+
+int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+	ulong cp, wp, data;
+	int i, l, rc;
+
+	wp = (addr & ~3);	/* get lower word aligned address */
+
+	/*
+	 * handle unaligned start bytes
+	 */
+	if ((l = addr - wp) != 0) {
+		data = 0;
+		for (i=0, cp=wp; i<l; ++i, ++cp) {
+			data = (data << 8) | (*(uchar *)cp);
+		}
+		for (; i<4 && cnt>0; ++i) {
+			data = (data << 8) | *src++;
+			--cnt;
+			++cp;
+		}
+		for (; cnt==0 && i<4; ++i, ++cp) {
+			data = (data << 8) | (*(uchar *)cp);
+		}
+
+		if ((rc = write_word(info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp += 4;
+	}
+
+	/*
+	 * handle word aligned part
+	 */
+	while (cnt >= 4) {
+		data = 0;
+		for (i=0; i<4; ++i) {
+			data = (data << 8) | *src++;
+		}
+		if ((rc = write_word(info, wp, data)) != 0) {
+			return (rc);
+		}
+		wp  += 4;
+		cnt -= 4;
+	}
+
+	if (cnt == 0) {
+		return (0);
+	}
+
+	/*
+	 * handle unaligned tail bytes
+	 */
+	data = 0;
+	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
+		data = (data << 8) | *src++;
+		--cnt;
+	}
+	for (; i<4; ++i, ++cp) {
+		data = (data << 8) | (*(uchar *)cp);
+	}
+
+	return (write_word(info, wp, data));
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+	vu_long *addr = (vu_long *)(info->start[0]);
+	ulong start;
+	int flag;
+
+	/* Check if Flash is (sufficiently) erased */
+	if ((*((vu_long *)dest) & data) != data) {
+		return (2);
+	}
+	/* Disable interrupts which might cause a timeout here */
+	flag = disable_interrupts();
+
+	addr[0xAAA] = 0xAAAAAAAA;
+	addr[0x555] = 0x55555555;
+	addr[0xAAA] = 0xA0A0A0A0;
+
+	*((vu_long *)dest) = data;
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* data polling for D7 */
+	start = get_timer (0);
+	while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080)) {
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			return (1);
+		}
+	}
+	return (0);
+}
+
+/*-----------------------------------------------------------------------
+ */