Initial revision

1 files changed, 766 insertions, 0 deletions

diff --git a/board/sandpoint/flash.c b/board/sandpoint/flash.c
new file mode 100644
index 0000000000..572199dd0a
--- /dev/null
+++ b/board/sandpoint/flash.c
@@ -0,0 +1,766 @@
+/*
+ * (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 <mpc824x.h>
+#include <asm/processor.h>
+#include <asm/pci_io.h>
+#include <w83c553f.h>
+
+#define ROM_CS0_START	0xFF800000
+#define ROM_CS1_START	0xFF000000
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips    */
+
+#if defined(CFG_ENV_IS_IN_FLASH)
+# ifndef  CFG_ENV_ADDR
+#  define CFG_ENV_ADDR  (CFG_FLASH_BASE + CFG_ENV_OFFSET)
+# endif
+# ifndef  CFG_ENV_SIZE
+#  define CFG_ENV_SIZE  CFG_ENV_SECT_SIZE
+# endif
+# ifndef  CFG_ENV_SECT_SIZE
+#  define CFG_ENV_SECT_SIZE  CFG_ENV_SIZE
+# endif
+#endif
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+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 /* 0 */
+
+/*flash command address offsets*/
+
+#if 0
+#define ADDR0           (0x555)
+#define ADDR1           (0x2AA)
+#define ADDR3           (0x001)
+#else
+#define ADDR0		(0xAAA)
+#define ADDR1		(0x555)
+#define ADDR3		(0x001)
+#endif
+
+#define FLASH_WORD_SIZE unsigned char
+
+/*-----------------------------------------------------------------------
+ */
+
+#if 0
+static int byte_parity_odd(unsigned char x) __attribute__ ((const));
+#endif /* 0 */
+static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));
+
+typedef struct
+{
+  FLASH_WORD_SIZE extval;
+  unsigned short intval;
+} map_entry;
+
+#if 0
+static int
+byte_parity_odd(unsigned char x)
+{
+  x ^= x >> 4;
+  x ^= x >> 2;
+  x ^= x >> 1;
+  return (x & 0x1) != 0;
+}
+#endif /* 0 */
+
+
+
+static unsigned long
+flash_id(unsigned char mfct, unsigned char chip)
+{
+  static const map_entry mfct_map[] =
+    {
+      {(FLASH_WORD_SIZE) AMD_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
+      {(FLASH_WORD_SIZE) FUJ_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
+      {(FLASH_WORD_SIZE) STM_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
+      {(FLASH_WORD_SIZE) MT_MANUFACT,	(unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
+      {(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
+      {(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
+    };
+
+  static const map_entry chip_map[] =
+  {
+    {AMD_ID_F040B,	FLASH_AM040},
+    {(FLASH_WORD_SIZE) STM_ID_x800AB,	FLASH_STM800AB}
+  };
+
+  const map_entry *p;
+  unsigned long result = FLASH_UNKNOWN;
+
+  /* find chip id */
+  for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
+    if(p->extval == chip)
+    {
+      result = FLASH_VENDMASK | p->intval;
+      break;
+    }
+
+  /* find vendor id */
+  for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
+    if(p->extval == mfct)
+    {
+      result &= ~FLASH_VENDMASK;
+      result |= (unsigned long) p->intval << 16;
+      break;
+    }
+
+  return result;
+}
+
+
+
+unsigned long
+flash_init(void)
+{
+  unsigned long i;
+  unsigned char j;
+  static const ulong flash_banks[] = CFG_FLASH_BANKS;
+
+  /* Init: no FLASHes known */
+  for (i = 0; i < CFG_MAX_FLASH_BANKS; i++)
+  {
+    flash_info_t * const pflinfo = &flash_info[i];
+    pflinfo->flash_id = FLASH_UNKNOWN;
+    pflinfo->size = 0;
+    pflinfo->sector_count = 0;
+  }
+
+  /* Enable writes to Sandpoint flash */
+  {
+    register unsigned char temp;
+    CONFIG_READ_BYTE(CFG_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
+    temp &= ~0x20; /* clear BIOSWP bit */
+    CONFIG_WRITE_BYTE(CFG_WINBOND_ISA_CFG_ADDR + WINBOND_CSCR, temp);
+  }
+
+  for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++)
+  {
+    flash_info_t * const pflinfo = &flash_info[i];
+    const unsigned long base_address = flash_banks[i];
+    volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;
+#if 0
+    volatile FLASH_WORD_SIZE * addr2;
+#endif
+#if 0
+    /* write autoselect sequence */
+    flash[0x5555] = 0xaa;
+    flash[0x2aaa] = 0x55;
+    flash[0x5555] = 0x90;
+#else
+    flash[0xAAA << (3 * i)] = 0xaa;
+    flash[0x555 << (3 * i)] = 0x55;
+    flash[0xAAA << (3 * i)] = 0x90;
+#endif
+    __asm__ __volatile__("sync");
+
+#if 0
+    pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);
+#else
+    pflinfo->flash_id = flash_id(flash[0x0], flash[0x2 + 14 * i]);
+#endif
+
+    switch(pflinfo->flash_id & FLASH_TYPEMASK)
+    {
+      case FLASH_AM040:
+        pflinfo->size = 0x00080000;
+	pflinfo->sector_count = 8;
+        for(j = 0; j < 8; j++)
+	{
+	  pflinfo->start[j] = base_address + 0x00010000 * j;
+	  pflinfo->protect[j] = flash[(j << 16) | 0x2];
+	}
+	break;
+      case FLASH_STM800AB:
+	pflinfo->size = 0x00100000;
+	pflinfo->sector_count = 19;
+	pflinfo->start[0] = base_address;
+	pflinfo->start[1] = base_address + 0x4000;
+	pflinfo->start[2] = base_address + 0x6000;
+	pflinfo->start[3] = base_address + 0x8000;
+	for(j = 1; j < 16; j++)
+	{
+	  pflinfo->start[j+3] = base_address + 0x00010000 * j;
+	}
+#if 0
+        /* check for protected sectors */
+        for (j = 0; j < pflinfo->sector_count; j++) {
+          /* read sector protection at sector address, (A7 .. A0) = 0x02 */
+          /* D0 = 1 if protected */
+          addr2 = (volatile FLASH_WORD_SIZE *)(pflinfo->start[j]);
+            if (pflinfo->flash_id & FLASH_MAN_SST)
+              pflinfo->protect[j] = 0;
+            else
+              pflinfo->protect[j] = addr2[2] & 1;
+        }
+#endif
+	break;
+    }
+    /* Protect monitor and environment sectors
+     */
+#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
+    flash_protect(FLAG_PROTECT_SET,
+		CFG_MONITOR_BASE,
+		CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
+		&flash_info[0]);
+#endif
+
+#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
+    flash_protect(FLAG_PROTECT_SET,
+		CFG_ENV_ADDR,
+		CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
+		&flash_info[0]);
+#endif
+
+    /* reset device to read mode */
+    flash[0x0000] = 0xf0;
+    __asm__ __volatile__("sync");
+  }
+
+    return flash_info[0].size + flash_info[1].size;
+}
+
+#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_MAN_SST)
+          {
+            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)
+{
+  static const char unk[] = "Unknown";
+  const char *mfct = unk, *type = unk;
+  unsigned int i;
+
+  if(info->flash_id != FLASH_UNKNOWN)
+  {
+    switch(info->flash_id & FLASH_VENDMASK)
+    {
+      case FLASH_MAN_AMD:	mfct = "AMD";				break;
+      case FLASH_MAN_FUJ:	mfct = "FUJITSU";			break;
+      case FLASH_MAN_STM:	mfct = "STM";				break;
+      case FLASH_MAN_SST:	mfct = "SST";				break;
+      case FLASH_MAN_BM:	mfct = "Bright Microelectonics";	break;
+      case FLASH_MAN_INTEL:	mfct = "Intel";				break;
+    }
+
+    switch(info->flash_id & FLASH_TYPEMASK)
+    {
+      case FLASH_AM040:		type = "AM29F040B (512K * 8, uniform sector size)";	break;
+      case FLASH_AM400B:	type = "AM29LV400B (4 Mbit, bottom boot sect)";		break;
+      case FLASH_AM400T:	type = "AM29LV400T (4 Mbit, top boot sector)";		break;
+      case FLASH_AM800B:	type = "AM29LV800B (8 Mbit, bottom boot sect)";		break;
+      case FLASH_AM800T:	type = "AM29LV800T (8 Mbit, top boot sector)";		break;
+      case FLASH_AM160T:	type = "AM29LV160T (16 Mbit, top boot sector)";		break;
+      case FLASH_AM320B:	type = "AM29LV320B (32 Mbit, bottom boot sect)";	break;
+      case FLASH_AM320T:	type = "AM29LV320T (32 Mbit, top boot sector)";		break;
+      case FLASH_STM800AB:	type = "M29W800AB (8 Mbit, bottom boot sect)";		break;
+      case FLASH_SST800A:	type = "SST39LF/VF800 (8 Mbit, uniform sector size)";	break;
+      case FLASH_SST160A:	type = "SST39LF/VF160 (16 Mbit, uniform sector size)";	break;
+    }
+  }
+
+  printf(
+    "\n  Brand: %s Type: %s\n"
+    "  Size: %lu KB in %d Sectors\n",
+    mfct,
+    type,
+    info->size >> 10,
+    info->sector_count
+  );
+
+  printf ("  Sector Start Addresses:");
+
+  for (i = 0; i < info->sector_count; i++)
+  {
+    unsigned long size;
+    unsigned int erased;
+    unsigned long * flash = (unsigned long *) info->start[i];
+
+    /*
+     * Check if whole sector is erased
+     */
+    size =
+      (i != (info->sector_count - 1)) ?
+      (info->start[i + 1] - info->start[i]) >> 2 :
+      (info->start[0] + info->size - info->start[i]) >> 2;
+
+    for(
+      flash = (unsigned long *) info->start[i], erased = 1;
+      (flash != (unsigned long *) info->start[i] + size) && erased;
+      flash++
+    )
+      erased = *flash == ~0x0UL;
+
+    printf(
+      "%s %08lX %s %s",
+      (i % 5) ? "" : "\n   ",
+      info->start[i],
+      erased ? "E" : " ",
+      info->protect[i] ? "RO" : "  "
+    );
+  }
+
+  puts("\n");
+  return;
+}
+
+#if 0
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+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;
+
+    printf("flash_get_size: \n");
+    /* Write auto select command: read Manufacturer ID */
+    eieio();
+    addr2[ADDR0] = (FLASH_WORD_SIZE)0xAA;
+    addr2[ADDR1] = (FLASH_WORD_SIZE)0x55;
+    addr2[ADDR0] = (FLASH_WORD_SIZE)0x90;
+    value = addr2[0];
+
+    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  */
+    }
+    printf("recognised manufacturer");
+
+    value = addr2[ADDR3];          /* device ID        */
+        debug ("\ndev_code=%x\n", value);
+
+    switch (value) {
+    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      */
+
+    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      */
+
+    case (FLASH_WORD_SIZE)AMD_ID_F040B:
+        info->flash_id += FLASH_AM040;
+        info->sector_count = 8;
+        info->size = 0x00080000;
+        break;              /* => 0.5 MB      */
+
+    default:
+        info->flash_id = FLASH_UNKNOWN;
+        return (0);         /* => no or unknown flash */
+
+    }
+
+    printf("flash id %lx; sector count %x, size %lx\n", info->flash_id,info->sector_count,info->size);
+    /* set up sector start address table */
+        if (info->flash_id & FLASH_MAN_SST)
+          {
+            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_MAN_SST)
+                  info->protect[i] = 0;
+                else
+                  info->protect[i] = addr2[2] & 1;
+    }
+
+    /*
+     * Prevent writes to uninitialized FLASH.
+     */
+    if (info->flash_id != FLASH_UNKNOWN) {
+       addr2 = (FLASH_WORD_SIZE *)info->start[0];
+        *addr2 = (FLASH_WORD_SIZE)0x00F000F0;   /* reset bank */
+    }
+
+    return (info->size);
+}
+
+#endif
+
+
+int
+flash_erase(flash_info_t *info, int s_first, int s_last)
+{
+    volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
+    int flag, prot, sect, l_sect;
+    ulong start, now, last;
+    unsigned char sh8b;
+
+    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_MAN_STM | FLASH_AMD_COMP))) {
+        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;
+
+    /* Check the ROM CS */
+    if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
+      sh8b = 3;
+    else
+      sh8b = 0;
+
+    /* Disable interrupts which might cause a timeout here */
+    flag = disable_interrupts();
+
+    addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+    addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+    addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
+    addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+    addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+
+    /* Start erase on unprotected sectors */
+    for (sect = s_first; sect<=s_last; sect++) {
+        if (info->protect[sect] == 0) { /* not protected */
+            addr = (FLASH_WORD_SIZE *)(info->start[0] + (
+				(info->start[sect] - info->start[0]) << sh8b));
+                        if (info->flash_id & FLASH_MAN_SST)
+                          {
+                            addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+                            addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+                            addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
+                            addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+                            addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+                            addr[0] = (FLASH_WORD_SIZE)0x00500050;  /* block erase */
+                            udelay(30000);  /* wait 30 ms */
+                          }
+                        else
+                          addr[0] = (FLASH_WORD_SIZE)0x00300030;  /* sector erase */
+            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 = (FLASH_WORD_SIZE *)(info->start[0] + (
+			(info->start[l_sect] - info->start[0]) << sh8b));
+    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 */
+            serial_putc ('.');
+            last = now;
+        }
+    }
+
+DONE:
+    /* 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;
+        volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
+    ulong start;
+    int flag;
+        int i;
+    unsigned char sh8b;
+
+    /* Check the ROM CS */
+    if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
+      sh8b = 3;
+    else
+      sh8b = 0;
+
+    dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
+				info->start[0]);
+
+    /* Check if Flash is (sufficiently) erased */
+    if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
+        return (2);
+    }
+    /* Disable interrupts which might cause a timeout here */
+    flag = disable_interrupts();
+
+        for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
+          {
+            addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+            addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+            addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;
+
+            dest2[i << sh8b] = data2[i];
+
+            /* re-enable interrupts if necessary */
+            if (flag)
+              enable_interrupts();
+
+            /* data polling for D7 */
+            start = get_timer (0);
+            while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
+                   (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
+              if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+                return (1);
+              }
+            }
+          }
+
+    return (0);
+}
+
+/*-----------------------------------------------------------------------
+ */