Initial revision

2 files changed, 984 insertions, 0 deletions

diff --git a/board/gth/ee_access.c b/board/gth/ee_access.c
new file mode 100644
index 0000000..716c90e
--- /dev/null
+++ b/board/gth/ee_access.c
@@ -0,0 +1,335 @@
+/* Module for handling DALLAS DS2438, smart battery monitor
+   Chip can store up to 40 bytes of user data in EEPROM,
+   perform temp, voltage and current measurements.
+   Chip also contains a unique serial number.
+
+   Always read/write LSb first
+
+   For documentaion, see data sheet for DS2438, 2438.pdf
+
+   By Thomas.Lange@corelatus.com 001025 */
+
+#include <common.h>
+#include <config.h>
+#include <mpc8xx.h>
+
+#include <../board/gth/ee_dev.h>
+
+/* We dont have kernel functions */
+#define printk printf
+#define KERN_DEBUG
+#define KERN_ERR
+#define EIO 1
+
+static int Debug = 0;
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+/*
+ * lookup table ripped from DS app note 17, understanding and using
+ * cyclic redundancy checks...
+ */
+
+static u8 crc_lookup[256] = {
+	0,	94,	188,	226,	97,	63,	221,	131,
+	194,	156,	126,	32,	163,	253,	31,	65,
+	157,	195,	33,	127,	252,	162,	64,	30,
+	95,	1,	227,	189,	62,	96,	130,	220,
+	35,	125,	159,	193,	66,	28,	254,	160,
+	225,	191,	93,	3,	128,	222,	60,	98,
+	190,	224,	2,	92,	223,	129,	99,	61,
+	124,	34,	192,	158,	29,	67,	161,	255,
+	70,	24,	250,	164,	39,	121,	155,	197,
+	132,	218,	56,	102,	229,	187,	89,	7,
+	219,	133,	103,	57,	186,	228,	6,	88,
+	25,	71,	165,	251,	120,	38,	196,	154,
+	101,	59,	217,	135,	4,	90,	184,	230,
+	167,	249,	27,	69,	198,	152,	122,	36,
+	248,	166,	68,	26,	153,	199,	37,	123,
+	58,	100,	134,	216,	91,	5,	231,	185,
+	140,	210,	48,	110,	237,	179,	81,	15,
+	78,	16,	242,	172,	47,	113,	147,	205,
+	17,	79,	173,	243,	112,	46,	204,	146,
+	211,	141,	111,	49,	178,	236,	14,	80,
+	175,	241,	19,	77,	206,	144,	114,	44,
+	109,	51,	209,	143,	12,	82,	176,	238,
+	50,	108,	142,	208,	83,	13,	239,	177,
+	240,	174,	76,	18,	145,	207,	45,	115,
+	202,	148,	118,	40,	171,	245,	23,	73,
+	8,	86,	180,	234,	105,	55,	213,	139,
+	87,	9,	235,	181,	54,	104,	138,	212,
+	149,	203,	41,	119,	244,	170,	72,	22,
+	233,	183,	85,	11,	136,	214,	52,	106,
+	43,	117,	151,	201,	74,	20,	246,	168,
+	116,	42,	200,	150,	21,	75,	169,	247,
+	182,	232,	10,	84,	215,	137,	107,	53
+};
+
+static u8 make_new_crc( u8 Old_crc, u8 New_value ){
+  /* Compute a new checksum with new byte, using previous checksum as input
+     See DS app note 17, understanding and using cyclic redundancy checks...
+     Also see DS2438, page 11 */
+  return( crc_lookup[Old_crc ^ New_value ]);
+}
+
+int ee_crc_ok( u8 *Buffer, int Len, u8 Crc ){
+  /* Check if the checksum for this buffer is correct */
+  u8 Curr_crc=0;
+  int i;
+  u8 *Curr_byte = Buffer;
+
+  for(i=0;i<Len;i++){
+    Curr_crc = make_new_crc( Curr_crc, *Curr_byte);
+    Curr_byte++;
+  }
+  E_DEBUG("Calculated CRC = 0x%x, read = 0x%x\n", Curr_crc, Crc);
+
+  if(Curr_crc == Crc){
+    /* Good */
+    return(TRUE);
+  }
+  printk(KERN_ERR"EE checksum error, Calculated CRC = 0x%x, read = 0x%x\n",
+	Curr_crc, Crc);
+  return(FALSE);
+}
+
+static void
+set_idle(void){
+  /* Send idle and keep start time
+     Continous 1 is idle */
+  WRITE_PORT(1);
+}
+
+static int
+do_reset(void){
+  /* Release reset and verify that chip responds with presence pulse */
+  int Retries = 0;
+  while(Retries<5){
+    udelay(RESET_LOW_TIME);
+
+    /* Send reset */
+    WRITE_PORT(0);
+    udelay(RESET_LOW_TIME);
+
+    /* Release reset */
+    WRITE_PORT(1);
+
+    /* Wait for EEPROM to drive output */
+    udelay(PRESENCE_TIMEOUT);
+    if(!READ_PORT){
+      /* Ok, EEPROM is driving a 0 */
+      E_DEBUG("Presence detected\n");
+      if(Retries){
+	E_DEBUG("Retries %d\n",Retries);
+      }
+      /* Make sure chip releases pin */
+      udelay(PRESENCE_LOW_TIME);
+      return 0;
+    }
+    Retries++;
+  }
+
+  printk(KERN_ERR"EEPROM did not respond when releasing reset\n");
+
+    /* Make sure chip releases pin */
+  udelay(PRESENCE_LOW_TIME);
+
+  /* Set to idle again */
+  set_idle();
+
+  return(-EIO);
+}
+
+static u8
+read_byte(void){
+  /* Read a single byte from EEPROM
+     Read LSb first */
+  int i;
+  int Value;
+  u8 Result=0;
+#ifndef CFG_IMMR
+  u32 Flags;
+#endif
+
+  E_DEBUG("Reading byte\n");
+
+  for(i=0;i<8;i++){
+    /* Small delay between pulses */
+    udelay(1);
+
+#ifndef CFG_IMMR
+    /* Disable irq */
+    save_flags(Flags);
+    cli();
+#endif
+
+    /* Pull down pin short time to start read
+       See page 26 in data sheet */
+
+    WRITE_PORT(0);
+    udelay(READ_LOW);
+    WRITE_PORT(1);
+
+    /* Wait for chip to drive pin */
+    udelay(READ_TIMEOUT);
+
+    Value = READ_PORT;
+    if(Value)
+      Value=1;
+
+#ifndef CFG_IMMR
+    /* Enable irq */
+    restore_flags(Flags);
+#endif
+
+    /* Wait for chip to release pin */
+    udelay(TOTAL_READ_LOW-READ_TIMEOUT);
+
+    /* LSb first */
+    Result|=Value<<i;
+  }
+
+  E_DEBUG("Read byte 0x%x\n",Result);
+
+  return(Result);
+}
+
+static void
+write_byte(u8 Byte){
+  /* Write a single byte to EEPROM
+     Write LSb first */
+  int i;
+  int Value;
+#ifndef CFG_IMMR
+  u32 Flags;
+#endif
+
+  E_DEBUG("Writing byte 0x%x\n",Byte);
+
+  for(i=0;i<8;i++){
+    /* Small delay between pulses */
+    udelay(1);
+    Value = Byte&1;
+
+#ifndef CFG_IMMR
+    /* Disable irq */
+    save_flags(Flags);
+    cli();
+#endif
+
+    /* Pull down pin short time for a 1, long time for a 0
+       See page 26 in data sheet */
+
+    WRITE_PORT(0);
+    if(Value){
+      /* Write a 1 */
+      udelay(WRITE_1_LOW);
+    }
+    else{
+      /* Write a 0 */
+      udelay(WRITE_0_LOW);
+    }
+
+    WRITE_PORT(1);
+
+#ifndef CFG_IMMR
+    /* Enable irq */
+    restore_flags(Flags);
+#endif
+
+    if(Value)
+      /* Wait for chip to read the 1 */
+      udelay(TOTAL_WRITE_LOW-WRITE_1_LOW);
+    Byte>>=1;
+  }
+}
+
+int ee_do_command( u8 *Tx, int Tx_len, u8 *Rx, int Rx_len, int Send_skip ){
+  /* Execute this command string, including
+     giving reset and setting to idle after command
+     if Rx_len is set, we read out data from EEPROM */
+  int i;
+
+  E_DEBUG("Command, Tx_len %d, Rx_len %d\n", Tx_len, Rx_len );
+
+  if(do_reset()){
+    /* Failed! */
+    return(-EIO);
+  }
+
+  if(Send_skip)
+    /* Always send SKIP_ROM first to tell chip we are sending a command,
+       except when we read out rom data for chip */
+    write_byte(SKIP_ROM);
+
+  /* Always have Tx data */
+  for(i=0;i<Tx_len;i++){
+    write_byte(Tx[i]);
+  }
+
+  if(Rx_len){
+    for(i=0;i<Rx_len;i++){
+      Rx[i]=read_byte();
+    }
+  }
+
+  set_idle();
+
+  E_DEBUG("Command done\n");
+
+  return(0);
+}
+
+int ee_init_data(void){
+  int i;
+  u8 Tx[10];
+  int tmp;
+  volatile immap_t *immap = (immap_t *)CFG_IMMR;
+
+  while(0){
+    tmp = 1-tmp;
+    if(tmp)
+      immap->im_ioport.iop_padat &= ~PA_FRONT_LED;
+    else
+      immap->im_ioport.iop_padat |= PA_FRONT_LED;
+    udelay(1);
+  }
+
+  /* Set port to open drain to be able to read data from
+     port without setting it to input */
+  PORT_B_PAR &= ~PB_EEPROM;
+  PORT_B_ODR |= PB_EEPROM;
+  SET_PORT_B_OUTPUT(PB_EEPROM);
+
+  /* Set idle mode */
+  set_idle();
+
+  /* Copy all User EEPROM data to scratchpad */
+  for(i=0;i<USER_PAGES;i++){
+    Tx[0]=RECALL_MEMORY;
+    Tx[1]=EE_USER_PAGE_0+i;
+    if(ee_do_command(Tx,2,NULL,0,TRUE)) return(-EIO);
+  }
+
+  /* Make sure chip doesnt store measurements in NVRAM */
+  Tx[0]=WRITE_SCRATCHPAD;
+  Tx[1]=0; /* Page */
+  Tx[2]=9;
+  if(ee_do_command(Tx,3,NULL,0,TRUE)) return(-EIO);
+
+  Tx[0]=COPY_SCRATCHPAD;
+  if(ee_do_command(Tx,2,NULL,0,TRUE)) return(-EIO);
+
+  /* FIXME check status bit instead
+     Could take 10 ms to store in EEPROM */
+  for(i=0;i<10;i++){
+    udelay(1000);
+  }
+
+  return(0);
+}
diff --git a/board/gth/flash.c b/board/gth/flash.c
new file mode 100644
index 0000000..562a349
--- /dev/null
+++ b/board/gth/flash.c
@@ -0,0 +1,649 @@
+/*
+ * (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);
+
+/*-----------------------------------------------------------------------
+ * Protection Flags:
+ */
+#define FLAG_PROTECT_SET	0x01
+#define FLAG_PROTECT_CLEAR	0x02
+
+/*-----------------------------------------------------------------------
+ */
+
+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;
+
+	/*printf("faking");*/
+
+	return(0x1fffff);
+
+	/* Init: no FLASHes known */
+	for (i=0; i < CFG_MAX_FLASH_BANKS; ++i)
+	{
+		flash_info[i].flash_id = FLASH_UNKNOWN;
+	}
+
+	/* 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);
+	}
+
+#if 0
+	if (FLASH_BASE1_PRELIM != 0x0) {
+	  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);
+	  }
+	} else {
+#endif
+	  size_b1 = 0;
+
+	  /* Remap FLASH according to real size */
+	  memctl->memc_or0 = CFG_OR0_PRELIM;
+	  memctl->memc_br0 = CFG_BR0_PRELIM;
+
+	  /* 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 */
+	  (void)flash_protect(FLAG_PROTECT_SET,
+			    CFG_MONITOR_BASE,
+			    CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
+			    &flash_info[0]);
+#endif
+
+	if (size_b1)
+	{
+	  /* memctl->memc_or1 = CFG_OR1_PRELIM;
+	     memctl->memc_br1 = CFG_BR1_PRELIM; */
+
+		/* 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 */
+		(void)flash_protect(FLAG_PROTECT_SET,
+				    CFG_MONITOR_BASE,
+				    CFG_MONITOR_BASE+CFG_MONITOR_LEN-1,
+				    &flash_info[1]);
+#endif
+	}
+	else
+	{
+/*	    memctl->memc_or1 = CFG_OR1_PRELIM;
+ FIXME	    memctl->memc_br1 = CFG_BR1_PRELIM;  */
+
+		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;
+
+	return (size_b0 + size_b1);
+}
+
+
+static void flash_get_offsets (ulong base, flash_info_t *info)
+{
+	int i;
+
+	/* set up sector start adress table */
+	if (info->flash_id & FLASH_BTYPE)
+	{
+		/* set sector offsets for bottom boot block type	*/
+		for (i = 0; i < info->sector_count; i++)
+		{
+			info->start[i] = base + (i * 0x00040000);
+		}
+	}
+	else
+	{
+		/* set sector offsets for top boot block type		*/
+		i = info->sector_count - 1;
+		for (; i >= 0; i--)
+		{
+			info->start[i] = base + i * 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;
+	case FLASH_MAN_FUJ:	printf ("FUJITSU ");		break;
+	default:		printf ("Unknown Vendor ");	break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+
+#if 0
+	case FLASH_AM040B:
+		printf ("AM29F040B (4 Mbit, bottom boot sect)\n");
+		break;
+	case FLASH_AM040T:
+		printf ("AM29F040T (4 Mbit, top boot sect)\n");
+		break;
+#endif
+	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!
+ */
+
+static ulong flash_get_size (vu_long *addr, flash_info_t *info)
+{
+	short i;
+#if 0
+	ulong base = (ulong)addr;
+#endif
+	uchar value;
+
+	/* Write auto select command: read Manufacturer ID */
+#if 0
+	addr[0x0555] = 0x00AA00AA;
+	addr[0x02AA] = 0x00550055;
+	addr[0x0555] = 0x00900090;
+#else
+	addr[0x0555] = 0xAAAAAAAA;
+	addr[0x02AA] = 0x55555555;
+	addr[0x0555] = 0x90909090;
+#endif
+
+	value = addr[0];
+
+	switch (value)
+	{
+		case AMD_MANUFACT:case 0x01:
+			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;
+			break;
+	}
+
+	value = addr[1];			/* device ID		*/
+
+	switch (value)
+	{
+#if 0
+		case AMD_ID_F040B:
+			info->flash_id += FLASH_AM040B;
+			info->sector_count = 8;
+			info->size = 0x00200000;
+			break;				/* => 2 MB		*/
+#endif
+		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 */
+
+	}
+
+#if 0
+	/* set up sector start adress 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;
+		}
+	}
+#else
+	flash_get_offsets ((ulong)addr, &flash_info[0]);
+#endif
+
+	/* 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];
+#if 0
+		*addr = 0x00F000F0;	/* reset bank */
+#else
+		*addr = 0xF0F0F0F0;	/* reset bank */
+#endif
+	}
+
+	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 - 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();
+
+#if 0
+	addr[0x0555] = 0x00AA00AA;
+	addr[0x02AA] = 0x00550055;
+	addr[0x0555] = 0x00800080;
+	addr[0x0555] = 0x00AA00AA;
+	addr[0x02AA] = 0x00550055;
+#else
+	addr[0x0555] = 0xAAAAAAAA;
+	addr[0x02AA] = 0x55555555;
+	addr[0x0555] = 0x80808080;
+	addr[0x0555] = 0xAAAAAAAA;
+	addr[0x02AA] = 0x55555555;
+#endif
+
+	/* 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]);
+#if 0
+			addr[0] = 0x00300030;
+#else
+			addr[0] = 0x30303030;
+#endif
+			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]);
+#if 0
+	while ((addr[0] & 0x00800080) != 0x00800080)
+#else
+	while ((addr[0] & 0xFFFFFFFF) != 0xFFFFFFFF)
+#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 0
+	addr[0] = 0x00F000F0;	/* reset bank */
+#else
+	addr[0] = 0xF0F0F0F0;	/* reset bank */
+#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)
+{
+	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();
+
+#if 0
+	addr[0x0555] = 0x00AA00AA;
+	addr[0x02AA] = 0x00550055;
+	addr[0x0555] = 0x00A000A0;
+#else
+	addr[0x0555] = 0xAAAAAAAA;
+	addr[0x02AA] = 0x55555555;
+	addr[0x0555] = 0xA0A0A0A0;
+#endif
+
+	*((vu_long *)dest) = data;
+
+	/* re-enable interrupts if necessary */
+	if (flag)
+		enable_interrupts();
+
+	/* data polling for D7 */
+	start = get_timer (0);
+#if 0
+	while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080))
+#else
+	while ((*((vu_long *)dest) & 0x80808080) != (data & 0x80808080))
+#endif
+	{
+		if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+			return (1);
+		}
+	}
+	return (0);
+}
+
+/*-----------------------------------------------------------------------
+ */