// SPDX-License-Identifier: GPL-2.0+

  /*
   * (C) Copyright 2001
   * Denis Peter, MPL AG, d.peter@mpl.ch.

   */
  /*
   * Floppy Disk support
   */
  
  #include <common.h>
  #include <config.h>
  #include <command.h>
  #include <image.h>
  
  
  #undef	FDC_DEBUG
  
  #ifdef	FDC_DEBUG
  #define	PRINTF(fmt,args...)	printf (fmt ,##args)
  #else
  #define PRINTF(fmt,args...)
  #endif

  /*#if defined(CONFIG_CMD_DATE) */

  /*#include <rtc.h> */
  /*#endif */

  typedef struct {

  	int		flags;		/* connected drives ect */
  	unsigned long	blnr;		/* Logical block nr */
  	uchar		drive;		/* drive no */
  	uchar		cmdlen;		/* cmd length */
  	uchar		cmd[16];	/* cmd desc */
  	uchar		dma;		/* if > 0 dma enabled */
  	uchar		result[11];	/* status information */
  	uchar		resultlen;	/* lenght of result */

  } FDC_COMMAND_STRUCT;

  /* flags: only the lower 8bit used:
   * bit 0 if set drive 0 is present
   * bit 1 if set drive 1 is present
   * bit 2 if set drive 2 is present
   * bit 3 if set drive 3 is present
   * bit 4 if set disk in drive 0 is inserted
   * bit 5 if set disk in drive 1 is inserted
   * bit 6 if set disk in drive 2 is inserted
   * bit 7 if set disk in drive 4 is inserted
   */

  /* cmd indexes */

  #define COMMAND			0
  #define DRIVE			1

  #define CONFIG0			1

  #define SPEC_HUTSRT		1
  #define TRACK			2

  #define CONFIG1			2
  #define SPEC_HLT		2

  #define HEAD			3

  #define CONFIG2			3

  #define SECTOR			4
  #define SECTOR_SIZE		5
  #define LAST_TRACK		6
  #define GAP			7
  #define DTL			8

  /* result indexes */

  #define STATUS_0		0
  #define STATUS_PCN		1
  #define STATUS_1		1
  #define STATUS_2		2
  #define STATUS_TRACK		3
  #define STATUS_HEAD		4
  #define STATUS_SECT		5
  #define STATUS_SECT_SIZE	6

  
  
  /* Register addresses */
  #define FDC_BASE	0x3F0
  #define FDC_SRA		FDC_BASE + 0	/* Status Register A */
  #define FDC_SRB		FDC_BASE + 1	/* Status Register B */
  #define FDC_DOR		FDC_BASE + 2	/* Digital Output Register */
  #define FDC_TDR		FDC_BASE + 3	/* Tape Drive Register */
  #define FDC_DSR		FDC_BASE + 4	/* Data rate Register */
  #define FDC_MSR		FDC_BASE + 4	/* Main Status Register */
  #define FDC_FIFO	FDC_BASE + 5	/* FIFO */
  #define FDC_DIR		FDC_BASE + 6	/* Digital Input Register */
  #define FDC_CCR		FDC_BASE + 7	/* Configuration Control */
  /* Commands */

  #define FDC_CMD_SENSE_INT	0x08
  #define FDC_CMD_CONFIGURE	0x13
  #define FDC_CMD_SPECIFY		0x03
  #define FDC_CMD_RECALIBRATE	0x07
  #define FDC_CMD_READ		0x06
  #define FDC_CMD_READ_TRACK	0x02
  #define FDC_CMD_READ_ID		0x0A
  #define FDC_CMD_DUMP_REG	0x0E
  #define FDC_CMD_SEEK		0x0F
  
  #define FDC_CMD_SENSE_INT_LEN	0x01
  #define FDC_CMD_CONFIGURE_LEN	0x04
  #define FDC_CMD_SPECIFY_LEN	0x03
  #define FDC_CMD_RECALIBRATE_LEN	0x02
  #define FDC_CMD_READ_LEN	0x09
  #define FDC_CMD_READ_TRACK_LEN	0x09
  #define FDC_CMD_READ_ID_LEN	0x02
  #define FDC_CMD_DUMP_REG_LEN	0x01
  #define FDC_CMD_SEEK_LEN	0x03
  
  #define FDC_FIFO_THR		0x0C
  #define FDC_FIFO_DIS		0x00

  #define FDC_IMPLIED_SEEK	0x01

  #define FDC_POLL_DIS		0x00
  #define FDC_PRE_TRK		0x00
  #define FDC_CONFIGURE		FDC_FIFO_THR | (FDC_POLL_DIS<<4) | (FDC_FIFO_DIS<<5) | (FDC_IMPLIED_SEEK << 6)
  #define FDC_MFM_MODE		0x01 /* MFM enable */
  #define FDC_SKIP_MODE		0x00 /* skip enable */

  
  #define FDC_TIME_OUT 100000 /* time out */
  #define	FDC_RW_RETRIES		3 /* read write retries */
  #define FDC_CAL_RETRIES		3 /* calibration and seek retries */
  
  
  /* Disk structure */
  typedef struct  {

  	unsigned int size;	/* nr of sectors total */
  	unsigned int sect;	/* sectors per track */
  	unsigned int head;	/* nr of heads */
  	unsigned int track;	/* nr of tracks */
  	unsigned int stretch;	/* !=0 means double track steps */
  	unsigned char	gap;	/* gap1 size */
  	unsigned char	rate;	/* data rate. |= 0x40 for perpendicular */
  	unsigned char	spec1;	/* stepping rate, head unload time */
  	unsigned char	fmt_gap;/* gap2 size */
  	unsigned char hlt;	/* head load time */
  	unsigned char sect_code;/* Sector Size code */
  	const char	* name;	/* used only for predefined formats */

  } FD_GEO_STRUCT;
  
  
  /* supported Floppy types (currently only one) */
  const static FD_GEO_STRUCT floppy_type[2] = {
  	{ 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,16,2,"H1440" },	/*  7 1.44MB 3.5"   */
  	{    0, 0,0, 0,0,0x00,0x00,0x00,0x00, 0,0,NULL    },	/*  end of table    */
  };
  
  static FDC_COMMAND_STRUCT cmd; /* global command struct */

  /* If the boot drive number is undefined, we assume it's drive 0             */

  #ifndef CONFIG_SYS_FDC_DRIVE_NUMBER
  #define CONFIG_SYS_FDC_DRIVE_NUMBER 0

  #endif
  
  /* Hardware access */

  #ifndef CONFIG_SYS_ISA_IO_STRIDE
  #define CONFIG_SYS_ISA_IO_STRIDE 1

  #endif

  #ifndef CONFIG_SYS_ISA_IO_OFFSET
  #define CONFIG_SYS_ISA_IO_OFFSET 0

  #endif

  /* Supporting Functions */
  /* reads a Register of the FDC */
  unsigned char read_fdc_reg(unsigned int addr)
  {

  	volatile unsigned char *val =

  		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
  					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
  					   CONFIG_SYS_ISA_IO_OFFSET);

  	return val [0];

  }
  
  /* writes a Register of the FDC */
  void write_fdc_reg(unsigned int addr, unsigned char val)
  {

  	volatile unsigned char *tmp =

  		(volatile unsigned char *)(CONFIG_SYS_ISA_IO_BASE_ADDRESS +
  					   (addr * CONFIG_SYS_ISA_IO_STRIDE) +
  					   CONFIG_SYS_ISA_IO_OFFSET);

  	tmp[0]=val;

  }
  
  /* waits for an interrupt (polling) */
  int wait_for_fdc_int(void)
  {
  	unsigned long timeout;
  	timeout = FDC_TIME_OUT;
  	while((read_fdc_reg(FDC_SRA)&0x80)==0) {
  		timeout--;
  		udelay(10);

  		if(timeout==0) /* timeout occurred */

  			return false;

  	}

  	return true;

  }

  /* reads a byte from the FIFO of the FDC and checks direction and RQM bit
     of the MSR. returns -1 if timeout, or byte if ok */
  int read_fdc_byte(void)
  {
  	unsigned long timeout;
  	timeout = FDC_TIME_OUT;
  	while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
  		/* direction out and ready */
  		udelay(10);
  		timeout--;

  		if(timeout==0) /* timeout occurred */

  			return -1;
  	}
  	return read_fdc_reg(FDC_FIFO);
  }
  
  /* if the direction of the FIFO is wrong, this routine is used to
     empty the FIFO. Should _not_ be used */
  int fdc_need_more_output(void)
  {
  	unsigned char c;
  	while((read_fdc_reg(FDC_MSR)&0xC0)==0xC0)	{
  			c=(unsigned char)read_fdc_byte();
  			printf("Error: more output: %x
  ",c);
  	}

  	return true;

  }
  
  
  /* writes a byte to the FIFO of the FDC and checks direction and RQM bit
     of the MSR */
  int write_fdc_byte(unsigned char val)
  {
  	unsigned long timeout;
  	timeout = FDC_TIME_OUT;
  	while((read_fdc_reg(FDC_MSR)&0xC0)!=0x80) {
  		/* direction in and ready for byte */
  		timeout--;
  		udelay(10);
  		fdc_need_more_output();

  		if(timeout==0) /* timeout occurred */

  			return false;

  	}
  	write_fdc_reg(FDC_FIFO,val);

  	return true;

  }
  
  /* sets up all FDC commands and issues it to the FDC. If
     the command causes direct results (no Execution Phase)
     the result is be read as well. */
  
  int fdc_issue_cmd(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
  {
  	int i;
  	unsigned long head,track,sect,timeout;
  	track = pCMD->blnr / (pFG->sect * pFG->head); /* track nr */
  	sect =  pCMD->blnr % (pFG->sect * pFG->head); /* remaining blocks */
  	head = sect / pFG->sect; /* head nr */
  	sect =  sect % pFG->sect; /* remaining blocks */
  	sect++; /* sectors are 1 based */

  	PRINTF("Cmd 0x%02x Track %ld, Head %ld, Sector %ld, Drive %d (blnr %ld)
  ",
  		pCMD->cmd[0],track,head,sect,pCMD->drive,pCMD->blnr);

  	if(head|=0) { /* max heads = 2 */
  		pCMD->cmd[DRIVE]=pCMD->drive | 0x04; /* head 1 */
  		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
  	}
  	else {
  		pCMD->cmd[DRIVE]=pCMD->drive; /* head 0 */
  		pCMD->cmd[HEAD]=(unsigned char) head; /* head register */
  	}
  	pCMD->cmd[TRACK]=(unsigned char) track; /* track */
  	switch (pCMD->cmd[COMMAND]) {
  		case FDC_CMD_READ:
  			pCMD->cmd[SECTOR]=(unsigned char) sect; /* sector */
  			pCMD->cmd[SECTOR_SIZE]=pFG->sect_code; /* sector size code */
  			pCMD->cmd[LAST_TRACK]=pFG->sect; /* End of track */
  			pCMD->cmd[GAP]=pFG->gap; /* gap */
  			pCMD->cmd[DTL]=0xFF; /* DTL */
  			pCMD->cmdlen=FDC_CMD_READ_LEN;
  			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
  			pCMD->cmd[COMMAND]|=(FDC_SKIP_MODE<<5); /* set Skip bit */
  			pCMD->resultlen=0;  /* result only after execution */
  			break;
  		case FDC_CMD_SEEK:
  			pCMD->cmdlen=FDC_CMD_SEEK_LEN;
  			pCMD->resultlen=0;  /* no result */
  			break;
  		case FDC_CMD_CONFIGURE:
  			pCMD->cmd[CONFIG0]=0;
  			pCMD->cmd[CONFIG1]=FDC_CONFIGURE; /* FIFO Threshold, Poll, Enable FIFO */

  			pCMD->cmd[CONFIG2]=FDC_PRE_TRK;	/* Precompensation Track */

  			pCMD->cmdlen=FDC_CMD_CONFIGURE_LEN;
  			pCMD->resultlen=0;  /* no result */
  			break;
  		case FDC_CMD_SPECIFY:
  			pCMD->cmd[SPEC_HUTSRT]=pFG->spec1;
  			pCMD->cmd[SPEC_HLT]=(pFG->hlt)<<1; /* head load time */
  			if(pCMD->dma==0)
  				pCMD->cmd[SPEC_HLT]|=0x1; /* no dma */
  			pCMD->cmdlen=FDC_CMD_SPECIFY_LEN;
  			pCMD->resultlen=0;  /* no result */
  			break;
  		case FDC_CMD_DUMP_REG:
  			pCMD->cmdlen=FDC_CMD_DUMP_REG_LEN;
  			pCMD->resultlen=10;  /* 10 byte result */
  			break;
  		case FDC_CMD_READ_ID:
  			pCMD->cmd[COMMAND]|=(FDC_MFM_MODE<<6); /* set MFM bit */
  			pCMD->cmdlen=FDC_CMD_READ_ID_LEN;
  			pCMD->resultlen=7;  /* 7 byte result */
  			break;
  		case FDC_CMD_RECALIBRATE:
  			pCMD->cmd[DRIVE]&=0x03; /* don't set the head bit */
  			pCMD->cmdlen=FDC_CMD_RECALIBRATE_LEN;
  			pCMD->resultlen=0;  /* no result */
  			break;
  			break;
  		case FDC_CMD_SENSE_INT:
  			pCMD->cmdlen=FDC_CMD_SENSE_INT_LEN;
  			pCMD->resultlen=2;
  			break;
  	}
  	for(i=0;i<pCMD->cmdlen;i++) {
  		/* PRINTF("write cmd%d = 0x%02X
  ",i,pCMD->cmd[i]); */

  		if (write_fdc_byte(pCMD->cmd[i]) == false) {

  			PRINTF("Error: timeout while issue cmd%d
  ",i);

  			return false;

  		}
  	}
  	timeout=FDC_TIME_OUT;
  	for(i=0;i<pCMD->resultlen;i++) {
  		while((read_fdc_reg(FDC_MSR)&0xC0)!=0xC0) {
  			timeout--;
  			if(timeout==0) {
  				PRINTF(" timeout while reading result%d MSR=0x%02X
  ",i,read_fdc_reg(FDC_MSR));

  				return false;

  			}
  		}
  		pCMD->result[i]=(unsigned char)read_fdc_byte();
  	}

  	return true;

  }
  
  /* selects the drive assigned in the cmd structur and
     switches on the Motor */
  void select_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
  {
  	unsigned char val;
  
  	val=(1<<(4+pCMD->drive))|pCMD->drive|0xC; /* set reset, dma gate and motor bits */
  	if((read_fdc_reg(FDC_DOR)&val)!=val) {
  		write_fdc_reg(FDC_DOR,val);
  		for(val=0;val<255;val++)
  			udelay(500); /* wait some time to start motor */
  	}
  }
  
  /* switches off the Motor of the specified drive */
  void stop_fdc_drive(FDC_COMMAND_STRUCT *pCMD)
  {
  	unsigned char val;
  
  	val=(1<<(4+pCMD->drive))|pCMD->drive; /* sets motor bits */
  	write_fdc_reg(FDC_DOR,(read_fdc_reg(FDC_DOR)&~val));
  }
  
  /* issues a recalibrate command, waits for interrupt and
   * issues a sense_interrupt */
  int fdc_recalibrate(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
  {
  	pCMD->cmd[COMMAND]=FDC_CMD_RECALIBRATE;

  	if (fdc_issue_cmd(pCMD, pFG) == false)
  		return false;
  	while (wait_for_fdc_int() != true);

  	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
  	return(fdc_issue_cmd(pCMD,pFG));
  }
  
  /* issues a recalibrate command, waits for interrupt and
   * issues a sense_interrupt */
  int fdc_seek(FDC_COMMAND_STRUCT *pCMD,FD_GEO_STRUCT *pFG)
  {
  	pCMD->cmd[COMMAND]=FDC_CMD_SEEK;

  	if (fdc_issue_cmd(pCMD, pFG) == false)
  		return false;
  	while (wait_for_fdc_int() != true);

  	pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;
  	return(fdc_issue_cmd(pCMD,pFG));
  }

  /* terminates current command, by not servicing the FIFO
   * waits for interrupt and fills in the result bytes */
  int fdc_terminate(FDC_COMMAND_STRUCT *pCMD)
  {
  	int i;
  	for(i=0;i<100;i++)
  		udelay(500); /* wait 500usec for fifo overrun */

  	while((read_fdc_reg(FDC_SRA)&0x80)==0x00); /* wait as long as no int has occurred */

  	for(i=0;i<7;i++) {
  		pCMD->result[i]=(unsigned char)read_fdc_byte();
  	}

  	return true;

  }
  
  /* reads data from FDC, seek commands are issued automatic */
  int fdc_read_data(unsigned char *buffer, unsigned long blocks,FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
  {
    /* first seek to start address */

  	unsigned long len,readblk,i,timeout,ii,offset;
  	unsigned char c,retriesrw,retriescal;

  	unsigned char *bufferw; /* working buffer */
  	int sect_size;
  	int flags;
  
  	flags=disable_interrupts(); /* switch off all Interrupts */
  	select_fdc_drive(pCMD); /* switch on drive */
  	sect_size=0x080<<pFG->sect_code;
  	retriesrw=0;
  	retriescal=0;
  	offset=0;

  	if (fdc_seek(pCMD, pFG) == false) {

  		stop_fdc_drive(pCMD);

  		if (flags)
  			enable_interrupts();

  		return false;

  	}
  	if((pCMD->result[STATUS_0]&0x20)!=0x20) {
  		printf("Seek error Status: %02X
  ",pCMD->result[STATUS_0]);
  		stop_fdc_drive(pCMD);

  		if (flags)
  			enable_interrupts();

  		return false;

  	}

  	/* now determine the next seek point */

  	/*	lastblk=pCMD->blnr + blocks; */

  	/*	readblk=(pFG->head*pFG->sect)-(pCMD->blnr%(pFG->head*pFG->sect)); */
  	readblk=pFG->sect-(pCMD->blnr%pFG->sect);
  	PRINTF("1st nr of block possible read %ld start %ld
  ",readblk,pCMD->blnr);
  	if(readblk>blocks) /* is end within 1st track */
  		readblk=blocks; /* yes, correct it */
  	PRINTF("we read %ld blocks start %ld
  ",readblk,pCMD->blnr);

  	bufferw = &buffer[0]; /* setup working buffer */

  	do {
  retryrw:
  		len=sect_size * readblk;
  		pCMD->cmd[COMMAND]=FDC_CMD_READ;

  		if (fdc_issue_cmd(pCMD, pFG) == false) {

  			stop_fdc_drive(pCMD);

  			if (flags)
  				enable_interrupts();

  			return false;

  		}
  		for (i=0;i<len;i++) {
  			timeout=FDC_TIME_OUT;
  			do {
  				c=read_fdc_reg(FDC_MSR);
  				if((c&0xC0)==0xC0) {
  					bufferw[i]=read_fdc_reg(FDC_FIFO);
  					break;
  				}
  				if((c&0xC0)==0x80) { /* output */

  					PRINTF("Transfer error transferred: at %ld, MSR=%02X
  ",i,c);

  					if(i>6) {
  						for(ii=0;ii<7;ii++) {
  							pCMD->result[ii]=bufferw[(i-7+ii)];
  						} /* for */
  					}
  					if(retriesrw++>FDC_RW_RETRIES) {
  						if (retriescal++>FDC_CAL_RETRIES) {
  							stop_fdc_drive(pCMD);

  							if (flags)
  								enable_interrupts();

  							return false;

  						}
  						else {
  							PRINTF(" trying to recalibrate Try %d
  ",retriescal);

  							if (fdc_recalibrate(pCMD, pFG) == false) {

  								stop_fdc_drive(pCMD);

  								if (flags)
  									enable_interrupts();

  								return false;

  							}
  							retriesrw=0;
  							goto retrycal;
  						} /* else >FDC_CAL_RETRIES */
  					}
  					else {
  						PRINTF("Read retry %d
  ",retriesrw);
  						goto retryrw;
  					} /* else >FDC_RW_RETRIES */
  				}/* if output */
  				timeout--;

  			} while (true);

  		} /* for len */
  		/* the last sector of a track or all data has been read,
  		 * we need to get the results */
  		fdc_terminate(pCMD);
  		offset+=(sect_size*readblk); /* set up buffer pointer */

  		bufferw = &buffer[offset];

  		pCMD->blnr+=readblk; /* update current block nr */
  		blocks-=readblk; /* update blocks */
  		if(blocks==0)
  			break; /* we are finish */
  		/* setup new read blocks */
  		/*	readblk=pFG->head*pFG->sect; */
  		readblk=pFG->sect;
  		if(readblk>blocks)
  			readblk=blocks;
  retrycal:
  		/* a seek is necessary */

  		if (fdc_seek(pCMD, pFG) == false) {

  			stop_fdc_drive(pCMD);

  			if (flags)
  				enable_interrupts();

  			return false;

  		}
  		if((pCMD->result[STATUS_0]&0x20)!=0x20) {
  			PRINTF("Seek error Status: %02X
  ",pCMD->result[STATUS_0]);
  			stop_fdc_drive(pCMD);

  			return false;

  		}

  	} while (true); /* start over */

  	stop_fdc_drive(pCMD); /* switch off drive */

  	if (flags)
  		enable_interrupts();

  	return true;

  }
  
  /* Scan all drives and check if drive is present and disk is inserted */
  int fdc_check_drive(FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)
  {
  	int i,drives,state;
    /* OK procedure of data book is satisfied.
  	 * trying to get some information over the drives */
  	state=0; /* no drives, no disks */
  	for(drives=0;drives<4;drives++) {
  		pCMD->drive=drives;
  		select_fdc_drive(pCMD);
  		pCMD->blnr=0; /* set to the 1st block */

  		if (fdc_recalibrate(pCMD, pFG) == false)

  			continue;

  		if((pCMD->result[STATUS_0]&0x10)==0x10)

  			continue;

  		/* ok drive connected check for disk */
  		state|=(1<<drives);
  		pCMD->blnr=pFG->size; /* set to the last block */

  		if (fdc_seek(pCMD, pFG) == false)

  			continue;

  		pCMD->blnr=0; /* set to the 1st block */

  		if (fdc_recalibrate(pCMD, pFG) == false)

  			continue;

  		pCMD->cmd[COMMAND]=FDC_CMD_READ_ID;

  		if (fdc_issue_cmd(pCMD, pFG) == false)

  			continue;

  		state|=(0x10<<drives);
  	}
  	stop_fdc_drive(pCMD);
  	for(i=0;i<4;i++) {
  		PRINTF("Floppy Drive %d %sconnected %sDisk inserted %s
  ",i,
  			((state&(1<<i))==(1<<i)) ? "":"not ",
  			((state&(0x10<<i))==(0x10<<i)) ? "":"no ",
  			((state&(0x10<<i))==(0x10<<i)) ? pFG->name : "");
  	}
  	pCMD->flags=state;

  	return true;

  }
  
  
  /**************************************************************************
  * int fdc_setup
  * setup the fdc according the datasheet
  * assuming in PS2 Mode
  */

  int fdc_setup(int drive, FDC_COMMAND_STRUCT *pCMD, FD_GEO_STRUCT *pFG)

  {

  	int i;

  #ifdef CONFIG_SYS_FDC_HW_INIT

  	fdc_hw_init ();

  #endif

  	/* first, we reset the FDC via the DOR */
  	write_fdc_reg(FDC_DOR,0x00);
  	for(i=0; i<255; i++) /* then we wait some time */
  		udelay(500);
  	/* then, we clear the reset in the DOR */

  	pCMD->drive=drive;

  	select_fdc_drive(pCMD);
  	/* initialize the CCR */
  	write_fdc_reg(FDC_CCR,pFG->rate);
  	/* then initialize the DSR */
  	write_fdc_reg(FDC_DSR,pFG->rate);

  	if (wait_for_fdc_int() == false) {

  			PRINTF("Time Out after writing CCR
  ");

  			return false;

  	}
  	/* now issue sense Interrupt and status command
  	 * assuming only one drive present (drive 0) */
  	pCMD->dma=0; /* we don't use any dma at all */
  	for(i=0;i<4;i++) {
  		/* issue sense interrupt for all 4 possible drives */
  		pCMD->cmd[COMMAND]=FDC_CMD_SENSE_INT;

  		if (fdc_issue_cmd(pCMD, pFG) == false) {

  			PRINTF("Sense Interrupt for drive %d failed
  ",i);
  		}
  	}

  	/* issue the configure command */
  	pCMD->drive=drive;

  	select_fdc_drive(pCMD);
  	pCMD->cmd[COMMAND]=FDC_CMD_CONFIGURE;

  	if (fdc_issue_cmd(pCMD, pFG) == false) {

  		PRINTF(" configure timeout
  ");
  		stop_fdc_drive(pCMD);

  		return false;

  	}
  	/* issue specify command */
  	pCMD->cmd[COMMAND]=FDC_CMD_SPECIFY;

  	if (fdc_issue_cmd(pCMD, pFG) == false) {

  		PRINTF(" specify timeout
  ");
  		stop_fdc_drive(pCMD);

  		return false;

  
  	}
  	/* then, we clear the reset in the DOR */
  	/* fdc_check_drive(pCMD,pFG);	*/
  	/*	write_fdc_reg(FDC_DOR,0x04); */

  	return true;

  }

  /****************************************************************************
   * main routine do_fdcboot
   */

  int do_fdcboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])

  {
  	FD_GEO_STRUCT *pFG = (FD_GEO_STRUCT *)floppy_type;
  	FDC_COMMAND_STRUCT *pCMD = &cmd;

  	unsigned long addr,imsize;

  #if defined(CONFIG_IMAGE_FORMAT_LEGACY)

  	image_header_t *hdr;  /* used for fdc boot */

  #endif

  	unsigned char boot_drive;
  	int i,nrofblk;

  #if defined(CONFIG_FIT)

  	const void *fit_hdr = NULL;

  #endif

  
  	switch (argc) {
  	case 1:

  		addr = CONFIG_SYS_LOAD_ADDR;
  		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;

  		break;
  	case 2:
  		addr = simple_strtoul(argv[1], NULL, 16);

  		boot_drive=CONFIG_SYS_FDC_DRIVE_NUMBER;

  		break;
  	case 3:
  		addr = simple_strtoul(argv[1], NULL, 16);
  		boot_drive=simple_strtoul(argv[2], NULL, 10);
  		break;
  	default:

  		return CMD_RET_USAGE;

  	}
  	/* setup FDC and scan for drives  */

  	if (fdc_setup(boot_drive, pCMD, pFG) == false) {

  		printf("
  ** Error in setup FDC **
  ");
  		return 1;
  	}

  	if (fdc_check_drive(pCMD, pFG) == false) {

  		printf("
  ** Error in check_drives **
  ");
  		return 1;
  	}
  	if((pCMD->flags&(1<<boot_drive))==0) {
  		/* drive not available */
  		printf("
  ** Drive %d not availabe **
  ",boot_drive);
  		return 1;
  	}
  	if((pCMD->flags&(0x10<<boot_drive))==0) {
  		/* no disk inserted */
  		printf("
  ** No disk inserted in drive %d **
  ",boot_drive);
  		return 1;
  	}
  	/* ok, we have a valid source */
  	pCMD->drive=boot_drive;
  	/* read first block */
  	pCMD->blnr=0;

  	if (fdc_read_data((unsigned char *)addr, 1, pCMD, pFG) == false) {

  		printf("
  Read error:");
  		for(i=0;i<7;i++)
  			printf("result%d: 0x%02X
  ",i,pCMD->result[i]);
  		return 1;
  	}

  	switch (genimg_get_format ((void *)addr)) {

  #if defined(CONFIG_IMAGE_FORMAT_LEGACY)

  	case IMAGE_FORMAT_LEGACY:
  		hdr = (image_header_t *)addr;

  		image_print_contents (hdr);
  
  		imsize = image_get_image_size (hdr);
  		break;

  #endif

  #if defined(CONFIG_FIT)
  	case IMAGE_FORMAT_FIT:

  		fit_hdr = (const void *)addr;

  		puts ("Fit image detected...
  ");
  
  		imsize = fit_get_size (fit_hdr);
  		break;

  #endif
  	default:
  		puts ("** Unknown image type
  ");

  		return 1;
  	}

  	nrofblk=imsize/512;
  	if((imsize%512)>0)
  		nrofblk++;
  	printf("Loading %ld Bytes (%d blocks) at 0x%08lx..
  ",imsize,nrofblk,addr);
  	pCMD->blnr=0;

  	if (fdc_read_data((unsigned char *)addr, nrofblk, pCMD, pFG) == false) {

  		/* read image block */
  		printf("
  Read error:");
  		for(i=0;i<7;i++)
  			printf("result%d: 0x%02X
  ",i,pCMD->result[i]);
  		return 1;
  	}
  	printf("OK %ld Bytes loaded.
  ",imsize);
  
  	flush_cache (addr, imsize);

  #if defined(CONFIG_FIT)
  	/* This cannot be done earlier, we need complete FIT image in RAM first */

  	if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
  		if (!fit_check_format (fit_hdr)) {
  			puts ("** Bad FIT image format
  ");
  			return 1;
  		}
  		fit_print_contents (fit_hdr);
  	}

  #endif
  
  	/* Loading ok, update default load address */

  	load_addr = addr;

  	return bootm_maybe_autostart(cmdtp, argv[0]);

  }

  U_BOOT_CMD(
  	fdcboot,	3,	1,	do_fdcboot,

  	"boot from floppy device",

  	"loadAddr drive"

  );