Пример #1
0
void do_program_ecc(unsigned long tlb_word2_i_value)
{
	unsigned long mcopt1;
	unsigned long mcopt2;
	unsigned long mcstat;
	phys_size_t memsize = sdram_memsize();

	if (memsize > CONFIG_MAX_MEM_MAPPED) {
		printf("\nWarning: Can't enable ECC on systems with more than 2GB of SDRAM!\n");
		return;
	}

	mfsdram(SDRAM_MCOPT1, mcopt1);
	mfsdram(SDRAM_MCOPT2, mcopt2);

	if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) {
		/* DDR controller must be enabled and not in self-refresh. */
		mfsdram(SDRAM_MCSTAT, mcstat);
		if (((mcopt2 & SDRAM_MCOPT2_DCEN_MASK) == SDRAM_MCOPT2_DCEN_ENABLE)
		    && ((mcopt2 & SDRAM_MCOPT2_SREN_MASK) == SDRAM_MCOPT2_SREN_EXIT)
		    && ((mcstat & (SDRAM_MCSTAT_MIC_MASK | SDRAM_MCSTAT_SRMS_MASK))
			== (SDRAM_MCSTAT_MIC_COMP | SDRAM_MCSTAT_SRMS_NOT_SF))) {

			program_ecc_addr(0, memsize, tlb_word2_i_value);
		}
	}
}
Пример #2
0
void board_add_ram_info(int use_default)
{
	PPC4xx_SYS_INFO board_cfg;
	u32 val;

	mfsdram(DDR0_22, val);
	val &= DDR0_22_CTRL_RAW_MASK;
	switch (val) {
	case DDR0_22_CTRL_RAW_ECC_DISABLE:
		puts(" (ECC disabled");
		break;
	case DDR0_22_CTRL_RAW_ECC_CHECK_ONLY:
		puts(" (ECC check only");
		break;
	case DDR0_22_CTRL_RAW_NO_ECC_RAM:
		puts(" (no ECC ram");
		break;
	case DDR0_22_CTRL_RAW_ECC_ENABLE:
		puts(" (ECC enabled");
		break;
	}

	get_sys_info(&board_cfg);
	printf(", %d MHz", (board_cfg.freqPLB * 2) / 1000000);

	mfsdram(DDR0_03, val);
	val = DDR0_03_CASLAT_DECODE(val);
	printf(", CL%d)", val);
}
Пример #3
0
/*---------------------------------------------------------------------------+
 * program_ecc.
 *---------------------------------------------------------------------------*/
static void program_ecc(unsigned long start_address, unsigned long num_bytes)
{
	u32 val;
	char str[] = "ECC generation -";
#if defined(CONFIG_PRAM)
	u32 *magicPtr;
	u32 magic;

	if ((mfspr(dbcr0) & 0x80000000) == 0) {
		/* only if no external debugger is alive!
		 * Check whether vxWorks is using EDR logging, if yes zero
		 * also PostMortem and user reserved memory
		 */
		magicPtr = (u32 *)(start_address + num_bytes -
				(CONFIG_PRAM*1024) + sizeof(u32));
		magic = in_be32(magicPtr);
		debug("%s:  CONFIG_PRAM %d kB magic 0x%x 0x%p\n",
		      __FUNCTION__, CONFIG_PRAM,
		      magicPtr, magic);
		if (magic == 0xbeefbabe) {
			printf("%s: preserving at %p\n", __FUNCTION__, magicPtr);
			num_bytes -= (CONFIG_PRAM*1024) - PM_RESERVED_MEM;
		}
	}
#endif

	sync();
	eieio();

	puts(str);

	/* ECC bit set method for cached memory */
	/* Fast method, no noticeable delay */
	dcbz_area(start_address, num_bytes);
	dflush();
	blank_string(strlen(str));

	/* Clear error status */
	mfsdram(DDR0_00, val);
	mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);

	/*
	 * Clear possible ECC errors
	 * If not done, then we could get an interrupt later on when
	 * exceptions are enabled.
	 */
	mtspr(mcsr, mfspr(mcsr));

	/* Set 'int_mask' parameter to functionnal value */
	mfsdram(DDR0_01, val);
	mtsdram(DDR0_01, ((val &~ DDR0_01_INT_MASK_MASK) |
			  DDR0_01_INT_MASK_ALL_OFF));

	return;
}
Пример #4
0
static void program_ecc(u32 start_address,
			u32 num_bytes,
			u32 tlb_word2_i_value)
{
	u32 val;
	u32 current_addr = start_address;
	u32 size;
	int bytes_remaining;

	sync();
	wait_ddr_idle();

	/*
	 * Because of 440EPx errata CHIP 11, we don't touch the last 256
	 * bytes of SDRAM.
	 */
	bytes_remaining = num_bytes - CONFIG_SYS_MEM_TOP_HIDE;

	/*
	 * We have to write the ECC bytes by zeroing and flushing in smaller
	 * steps, since the whole 256MByte takes too long for the external
	 * watchdog.
	 */
	while (bytes_remaining > 0) {
		size = min((64 << 20), bytes_remaining);

		/* Write zero's to SDRAM */
		dcbz_area(current_addr, size);

		/* Write modified dcache lines back to memory */
		clean_dcache_range(current_addr, current_addr + size);

		current_addr += 64 << 20;
		bytes_remaining -= 64 << 20;
		WATCHDOG_RESET();
	}

	sync();
	wait_ddr_idle();

	/* Clear error status */
	mfsdram(DDR0_00, val);
	mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);

	/* Set 'int_mask' parameter to functionnal value */
	mfsdram(DDR0_01, val);
	mtsdram(DDR0_01, ((val &~ DDR0_01_INT_MASK_MASK) | DDR0_01_INT_MASK_ALL_OFF));

	sync();
	wait_ddr_idle();
}
Пример #5
0
static int is_ecc_enabled(void)
{
	u32 val;

	mfsdram(DDR0_22, val);
	return 0x3 == DDR0_22_CTRL_RAW_DECODE(val);
}
Пример #6
0
static void wait_ddr_idle(void)
{
	u32 val;

	do {
		mfsdram(SDRAM_MCSTAT, val);
	} while ((val & SDRAM_MCSTAT_IDLE_MASK) == SDRAM_MCSTAT_IDLE_NOT);
}
Пример #7
0
static void wait_init_complete(void)
{
	u32 val;

	do {
		mfsdram(SDRAM0_MCSTS, val);
	} while (!(val & 0x80000000));
}
Пример #8
0
static u32 is_ecc_enabled(void)
{
	u32 val;

	mfsdram(DDR0_22, val);
	val &= DDR0_22_CTRL_RAW_MASK;
	if (val)
		return 1;
	else
		return 0;
}
Пример #9
0
void board_add_ram_info(int use_default)
{
	u32 val;

	printf(" (ECC");
	if (!is_ecc_enabled()) {
		printf(" not");
	}
	printf(" enabled, %ld MHz", (2 * get_bus_freq(0)) / 1000000);

	mfsdram(DDR0_03, val);
	printf(", CL%d)", DDR0_03_CASLAT_LIN_DECODE(val) >> 1);
}
Пример #10
0
phys_size_t initdram(int board)
{
	register uint reg;
	int tr1_bank1, tr1_bank2;

	/*--------------------------------------------------------------------
	 * Setup some default
	 *------------------------------------------------------------------*/
	mtsdram(mem_uabba, 0x00000000);	/* ubba=0 (default)             */
	mtsdram(mem_slio, 0x00000000);	/* rdre=0 wrre=0 rarw=0         */
	mtsdram(mem_devopt, 0x00000000);	/* dll=0 ds=0 (normal)          */
	mtsdram(mem_clktr, 0x40000000);	/* ?? */
	mtsdram(mem_wddctr, 0x40000000);	/* ?? */

	/*clear this first, if the DDR is enabled by a debugger
	  then you can not make changes. */
	mtsdram(mem_cfg0, 0x00000000);	/* Disable EEC */

	/*--------------------------------------------------------------------
	 * Setup for board-specific specific mem
	 *------------------------------------------------------------------*/
	/*
	 * Following for CAS Latency = 2.5 @ 133 MHz PLB
	 */
	mtsdram(mem_b0cr, 0x000a4001);	/* SDBA=0x000 128MB, Mode 3, enabled */
	mtsdram(mem_b1cr, 0x080a4001);	/* SDBA=0x080 128MB, Mode 3, enabled */

	mtsdram(mem_tr0, 0x410a4012);	/* ?? */
	mtsdram(mem_rtr, 0x04080000);	/* ?? */
	mtsdram(mem_cfg1, 0x00000000);	/* Self-refresh exit, disable PM    */
	mtsdram(mem_cfg0, 0x30000000);	/* Disable EEC */
	udelay(400);		/* Delay 200 usecs (min)            */

	/*--------------------------------------------------------------------
	 * Enable the controller, then wait for DCEN to complete
	 *------------------------------------------------------------------*/
	mtsdram(mem_cfg0, 0x80000000);	/* Enable */

	for (;;) {
		mfsdram(mem_mcsts, reg);
		if (reg & 0x80000000)
			break;
	}

	sdram_tr1_set(0x00000000, &tr1_bank1);
	sdram_tr1_set(0x08000000, &tr1_bank2);
	mtsdram(mem_tr1, (((tr1_bank1+tr1_bank2)/2) | 0x80800800));

	return CFG_SDRAM_BANKS * (CFG_KBYTES_SDRAM * 1024);	/* return bytes */
}
Пример #11
0
void board_add_ram_info(int use_default)
{
	PPC4xx_SYS_INFO board_cfg;
	u32 val;

	if (is_ecc_enabled())
		puts(" (ECC");
	else
		puts(" (ECC not");

	get_sys_info(&board_cfg);
	printf(" enabled, %ld MHz", (board_cfg.freqPLB * 2) / 1000000);

	mfsdram(DDR0_03, val);
	val = DDR0_03_CASLAT_DECODE(val);
	printf(", CL%d)", val);
}
Пример #12
0
/*************************************************************************
 *  fixed sdram init -- doesn't use serial presence detect.
 *
 *  Assumes:    64 MB, non-ECC, non-registered
 *              PLB @ 133 MHz
 *
 ************************************************************************/
long int fixed_sdram( void )
{
	uint    reg;

#if 1 /* test-only */
	/*--------------------------------------------------------------------
	 * Setup some default
	 *------------------------------------------------------------------*/
	mtsdram( mem_uabba, 0x00000000 );   /* ubba=0 (default)             */
	mtsdram( mem_slio,  0x00000000 );   /* rdre=0 wrre=0 rarw=0         */
	mtsdram( mem_devopt,0x00000000 );   /* dll=0 ds=0 (normal)          */
	mtsdram( mem_wddctr,0x40000000 );   /* wrcp=0 dcd=0                 */
	mtsdram( mem_clktr, 0x40000000 );   /* clkp=1 (90 deg wr) dcdt=0    */

	/*--------------------------------------------------------------------
	 * Setup for board-specific specific mem
	 *------------------------------------------------------------------*/
	/*
	 * Following for CAS Latency = 2.5 @ 133 MHz PLB
	 */
	mtsdram( mem_b0cr, 0x00082001 );/* SDBA=0x000, 64MB, Mode 2, enabled*/
	mtsdram( mem_tr0,  0x410a4012 );/* WR=2  WD=1 CL=2.5 PA=3 CP=4 LD=2 */
	/* RA=10 RD=3                       */
	mtsdram( mem_tr1,  0x8080082f );/* SS=T2 SL=STAGE 3 CD=1 CT=0x02f   */
	mtsdram( mem_rtr,  0x08200000 );/* Rate 15.625 ns @ 133 MHz PLB     */
	mtsdram( mem_cfg1, 0x00000000 );/* Self-refresh exit, disable PM    */
	udelay( 400 );                  /* Delay 200 usecs (min)            */

	/*--------------------------------------------------------------------
	 * Enable the controller, then wait for DCEN to complete
	 *------------------------------------------------------------------*/
	mtsdram( mem_cfg0, 0x86000000 );/* DCEN=1, PMUD=1, 64-bit           */
	for(;;)
	{
		mfsdram( mem_mcsts, reg );
		if( reg & 0x80000000 )
			break;
	}

	return( 64 * 1024 * 1024 );      /* 64 MB                           */
#else
	return( 32 * 1024 * 1024 );      /* 64 MB                           */
#endif
}
Пример #13
0
/*
 *  void ecc_init()
 *
 *  Description:
 *    This routine initializes a range of DRAM ECC memory with known
 *    data and enables ECC checking.
 *
 *  TO DO:
 *    - Improve performance by utilizing cache.
 *    - Further generalize to make usable by other 4xx variants (e.g.
 *      440EPx, et al).
 *
 *  Input(s):
 *    start - A pointer to the start of memory covered by ECC requiring
 *	      initialization.
 *    size  - The size, in bytes, of the memory covered by ECC requiring
 *	      initialization.
 *
 *  Output(s):
 *    start - A pointer to the start of memory covered by ECC with
 *	      CFG_ECC_PATTERN written to all locations and ECC data
 *	      primed.
 *
 *  Returns:
 *    N/A
 */
void ecc_init(unsigned long * const start, unsigned long size)
{
	const unsigned long pattern = CFG_ECC_PATTERN;
	unsigned long * const end = (unsigned long * const)((long)start + size);
	unsigned long * current = start;
	unsigned long mcopt1;
	long increment;

	if (start >= end)
		return;

	mfsdram(SDRAM_ECC_CFG, mcopt1);

	/* Enable ECC generation without checking or reporting */

	mtsdram(SDRAM_ECC_CFG, ((mcopt1 & ~SDRAM_ECC_CFG_MCHK_MASK) |
				SDRAM_ECC_CFG_MCHK_GEN));

	increment = sizeof(u32);

#if defined(CONFIG_440)
	/*
	 * Look at the geometry of SDRAM (data width) to determine whether we
	 * can skip words when writing.
	 */

	if ((mcopt1 & SDRAM_ECC_CFG_DMWD_MASK) != SDRAM_ECC_CFG_DMWD_32)
		increment = sizeof(u64);
#endif /* defined(CONFIG_440) */

	while (current < end) {
		*current = pattern;
		 current = (unsigned long *)((long)current + increment);
	}

	/* Wait until the writes are finished. */

	sync();

	/* Enable ECC generation with checking and no reporting */

	mtsdram(SDRAM_ECC_CFG, ((mcopt1 & ~SDRAM_ECC_CFG_MCHK_MASK) |
				SDRAM_ECC_CFG_MCHK_CHK));
}
Пример #14
0
/*************************************************************************
 *  sdram_init -- doesn't use serial presence detect.
 *
 *  Assumes:    256 MB, ECC, non-registered
 *              PLB @ 133 MHz
 *
 ************************************************************************/
void sdram_init(void)
{
	register uint reg;

	/*--------------------------------------------------------------------
	 * Setup some default
	 *------------------------------------------------------------------*/
	mtsdram(mem_uabba, 0x00000000);	/* ubba=0 (default)             */
	mtsdram(mem_slio, 0x00000000);	/* rdre=0 wrre=0 rarw=0         */
	mtsdram(mem_devopt, 0x00000000);	/* dll=0 ds=0 (normal)          */
	mtsdram(mem_clktr, 0x40000000);	/* ?? */
	mtsdram(mem_wddctr, 0x40000000);	/* ?? */

	/*clear this first, if the DDR is enabled by a debugger
	   then you can not make changes. */
	mtsdram(mem_cfg0, 0x00000000);	/* Disable EEC */

	/*--------------------------------------------------------------------
	 * Setup for board-specific specific mem
	 *------------------------------------------------------------------*/
	/*
	 * Following for CAS Latency = 2.5 @ 133 MHz PLB
	 */
	mtsdram(mem_b0cr, 0x000a4001);	/* SDBA=0x000 128MB, Mode 3, enabled */
	mtsdram(mem_b1cr, 0x080a4001);	/* SDBA=0x080 128MB, Mode 3, enabled */
	mtsdram(mem_tr0, 0x410a4012);	/* ?? */
	mtsdram(mem_tr1, 0x8080080b);	/* ?? */
	mtsdram(mem_rtr, 0x04080000);	/* ?? */
	mtsdram(mem_cfg1, 0x00000000);	/* Self-refresh exit, disable PM    */
	mtsdram(mem_cfg0, 0x34000000);	/* Disable EEC */
	udelay(400);		/* Delay 200 usecs (min)            */

	/*--------------------------------------------------------------------
	 * Enable the controller, then wait for DCEN to complete
	 *------------------------------------------------------------------*/
	mtsdram(mem_cfg0, 0x84000000);	/* Enable */

	for (;;) {
		mfsdram(mem_mcsts, reg);
		if (reg & 0x80000000)
			break;
	}
}
Пример #15
0
static void ecc_init(ulong start, ulong size)
{
	ulong	current_addr;		/* current byte address */
	ulong	end_addr;		/* end of memory region */
	ulong	addr_inc;		/* address skip between writes */
	ulong	cfg0_reg;		/* for restoring ECC state */

	/*
	 * TODO: Enable dcache before running this test (speedup)
	 */

	mfsdram(mem_cfg0, cfg0_reg);
	mtsdram(mem_cfg0, (cfg0_reg & ~SDRAM_CFG0_MEMCHK) | SDRAM_CFG0_MEMCHK_GEN);

	/*
	 * look at geometry of SDRAM (data width) to determine whether we
	 * can skip words when writing
	 */
	if ((cfg0_reg & SDRAM_CFG0_DRAMWDTH) == SDRAM_CFG0_DRAMWDTH_32)
		addr_inc = 4;
	else
		addr_inc = 8;

	current_addr = start;
	end_addr = start + size;

	while (current_addr < end_addr) {
		*((ulong *)current_addr) = 0x00000000;
		current_addr += addr_inc;
	}

	/*
	 * TODO: Flush dcache and disable it again
	 */

	/*
	 * Enable ecc checking and parity errors
	 */
	mtsdram(mem_cfg0, (cfg0_reg & ~SDRAM_CFG0_MEMCHK) | SDRAM_CFG0_MEMCHK_CHK);
}
Пример #16
0
/*************************************************************************
 *  fixed sdram init -- doesn't use serial presence detect.
 *
 *  Assumes:    128 MB, non-ECC, non-registered
 *              PLB @ 133 MHz
 *
 ************************************************************************/
long int fixed_sdram (void)
{
	uint reg;

	/*--------------------------------------------------------------------
	 * Setup some default
	 *------------------------------------------------------------------*/
	mtsdram (SDRAM0_UABBA, 0x00000000);	/* ubba=0 (default)             */
	mtsdram (SDRAM0_SLIO, 0x00000000);		/* rdre=0 wrre=0 rarw=0         */
	mtsdram (SDRAM0_DEVOPT, 0x00000000);	/* dll=0 ds=0 (normal)          */
	mtsdram (SDRAM0_WDDCTR, 0x00000000);	/* wrcp=0 dcd=0                 */
	mtsdram (SDRAM0_CLKTR, 0x40000000);	/* clkp=1 (90 deg wr) dcdt=0    */

	/*--------------------------------------------------------------------
	 * Setup for board-specific specific mem
	 *------------------------------------------------------------------*/
	/*
	 * Following for CAS Latency = 2.5 @ 133 MHz PLB
	 */
	mtsdram (SDRAM0_B0CR, 0x000a4001);	/* SDBA=0x000 128MB, Mode 3, enabled */
	mtsdram (SDRAM0_TR0, 0x410a4012);	/* WR=2  WD=1 CL=2.5 PA=3 CP=4 LD=2 */
	/* RA=10 RD=3                       */
	mtsdram (SDRAM0_TR1, 0x8080082f);	/* SS=T2 SL=STAGE 3 CD=1 CT=0x02f   */
	mtsdram (SDRAM0_RTR, 0x08200000);	/* Rate 15.625 ns @ 133 MHz PLB     */
	mtsdram (SDRAM0_CFG1, 0x00000000);	/* Self-refresh exit, disable PM    */
	udelay (400);			/* Delay 200 usecs (min)            */

	/*--------------------------------------------------------------------
	 * Enable the controller, then wait for DCEN to complete
	 *------------------------------------------------------------------*/
	mtsdram (SDRAM0_CFG0, 0x86000000);	/* DCEN=1, PMUD=1, 64-bit           */
	for (;;) {
		mfsdram (SDRAM0_MCSTS, reg);
		if (reg & 0x80000000)
			break;
	}

	return (128 * 1024 * 1024);	/* 128 MB                           */
}
Пример #17
0
long int initdram(int board_type)
{
	/*
	 * Same as on Kilauea, Makalu generates exception 0x200
	 * (machine check) after trap_init() in board_init_f,
	 * when SDRAM is initialized here (late) and d-cache is
	 * used earlier as INIT_RAM.
	 * So for now, initialize DDR2 in init.S very early and
	 * also use it for INIT_RAM. Then this exception doesn't
	 * occur.
	 */
#if 0
	u32 val;

	/* base=00000000, size=128MByte (5), mode=2 (n*10*4) */
	mtsdram(SDRAM_MB0CF, 0x00005201);

	/* SET SDRAM_MB1CF - Not enabled */
	mtsdram(SDRAM_MB1CF, 0x00000000);

	/* SET SDRAM_MB2CF  - Not enabled */
	mtsdram(SDRAM_MB2CF, 0x00000000);

	/* SET SDRAM_MB3CF  - Not enabled */
	mtsdram(SDRAM_MB3CF, 0x00000000);

	/* SDRAM_CLKTR: Adv Addr clock by 90 deg */
	mtsdram(SDRAM_CLKTR, 0x80000000);

	/* Refresh Time register (0x30) Refresh every 7.8125uS */
	mtsdram(SDRAM_RTR, 0x06180000);

	/* SDRAM_SDTR1 */
	mtsdram(SDRAM_SDTR1, 0x80201000);

	/* SDRAM_SDTR2	*/
	mtsdram(SDRAM_SDTR2, 0x32204232);

	/* SDRAM_SDTR3	*/
	mtsdram(SDRAM_SDTR3, 0x080b0d1a);

	mtsdram(SDRAM_MMODE, 0x00000442);
	mtsdram(SDRAM_MEMODE, 0x00000404);

	/* SDRAM0_MCOPT1 (0X20) No ECC Gen */
	mtsdram(SDRAM_MCOPT1, 0x04322000);

	/* NOP */
	mtsdram(SDRAM_INITPLR0, 0xa8380000);
	/* precharge 3 DDR clock cycle */
	mtsdram(SDRAM_INITPLR1, 0x81900400);
	/* EMR2 twr = 2tck */
	mtsdram(SDRAM_INITPLR2, 0x81020000);
	/* EMR3  twr = 2tck */
	mtsdram(SDRAM_INITPLR3, 0x81030000);
	/* EMR DLL ENABLE twr = 2tck */
	mtsdram(SDRAM_INITPLR4, 0x81010404);
	/* MR w/ DLL reset
	 * Note: 5 is CL.  May need to be changed
	 */
	mtsdram(SDRAM_INITPLR5, 0x81000542);
	/* precharge 3 DDR clock cycle */
	mtsdram(SDRAM_INITPLR6, 0x81900400);
	/* Auto-refresh trfc = 26tck */
	mtsdram(SDRAM_INITPLR7, 0x8D080000);
	/* Auto-refresh trfc = 26tck */
	mtsdram(SDRAM_INITPLR8, 0x8D080000);
	/* Auto-refresh */
	mtsdram(SDRAM_INITPLR9, 0x8D080000);
	/* Auto-refresh */
	mtsdram(SDRAM_INITPLR10, 0x8D080000);
	/* MRS - normal operation; wait 2 cycle (set wait to tMRD) */
	mtsdram(SDRAM_INITPLR11, 0x81000442);
	mtsdram(SDRAM_INITPLR12, 0x81010780);
	mtsdram(SDRAM_INITPLR13, 0x81010400);
	mtsdram(SDRAM_INITPLR14, 0x00000000);
	mtsdram(SDRAM_INITPLR15, 0x00000000);

	/* SET MCIF0_CODT   Die Termination On */
	mtsdram(SDRAM_CODT, 0x0080f837);
	mtsdram(SDRAM_MODT0, 0x01800000);
	mtsdram(SDRAM_MODT1, 0x00000000);

	mtsdram(SDRAM_WRDTR, 0x00000000);

	/* SDRAM0_MCOPT2 (0X21) Start initialization */
	mtsdram(SDRAM_MCOPT2, 0x20000000);

	/* Step 5 */
	do {
		mfsdram(SDRAM_MCSTAT, val);
	} while ((val & SDRAM_MCSTAT_MIC_COMP) != SDRAM_MCSTAT_MIC_COMP);

	/* Step 6 */

	/* SDRAM_DLCR */
	mtsdram(SDRAM_DLCR, 0x030000a5);

	/* SDRAM_RDCC */
	mtsdram(SDRAM_RDCC, 0x40000000);

	/* SDRAM_RQDC */
	mtsdram(SDRAM_RQDC, 0x80000038);

	/* SDRAM_RFDC */
	mtsdram(SDRAM_RFDC, 0x00000209);

	/* Enable memory controller */
	mfsdram(SDRAM_MCOPT2, val);
	val |= SDRAM_MCOPT2_DCEN_ENABLE;
	mtsdram(SDRAM_MCOPT2, val);
#endif
	return (CFG_MBYTES_SDRAM << 20);
}
Пример #18
0
/*************************************************************************
 *
 * initdram -- 440EPx's DDR controller is a DENALI Core
 *
 ************************************************************************/
phys_size_t initdram (int board_type)
{
	unsigned char data[2];
	unsigned int chip, v, t, i, x, sz, ms, rr, rf, st;
	unsigned long speed;
	unsigned char mt, bl, cl, rk, tmp; /* memory type, burst length, cas latency, ranks */
	unsigned char map[3] = { SPD_TAC0, SPD_TAC1, SPD_TAC2 };
#ifdef DEBUG
	unsigned int j;
#endif

	chip = SPD_EEPROM_ADDRESS;

	debug("dram: about to probe chip 0x%x\n", chip);

	if(check_sane_spd(chip)){
		printf("dram: nonexistent or unusable spd eeprom\n");
		hang();
	}

#ifdef DEBUG
	debug("dram: raw");
	for(j = 0; j < 64; j++){
		if(i2c_read(chip, j, 1, data, 1) == 0){
			debug("%c%02x", (j % 16) ? ' ' : '\n', data[0]);
		}
	}
	debug("\n");
#endif

	/* rushed dump from spd to ddr controller, calculations hardwired from sequoia and generally iffy */

	if(i2c_read(chip, SPD_MEMORY_TYPE, 1, data, 1) != 0){
		return 0;
	}
	mt = data[0];

	switch(mt){
		case SPD_MEMORY_TYPE_DDR2_SDRAM :
			debug("dram: ddr2 memory\n");
			break;
		/* case SPD_MEMORY_TYPE_DDR_SDRAM  : */
		default :
			printf("dram: unsupported memory type 0x%x\n", mt);
			return 0;
	}

	speed = get_bus_freq(0);
	debug("dram: bus speed %luHz\n", speed);

	if(i2c_read(chip, SPD_REFRESH_RATE, 1, data, 1) != 0){
		return 0;
	}
	rr = decode_refresh(data[0]);
	debug("dram: refresh rate %ups\n", rr);

	xmtsdram(DDR0_02, DDR0_02_START_OFF);
	mfsdram(DDR0_02, ms);
	/* gives us the maximum dimensions the controller can do, used later */
	debug("dram: controller caps 0x%08x\n", ms);

	/* calibration values as recommended */
	xmtsdram(DDR0_00, DDR0_00_DLL_INCREMENT_ENCODE(0x19) | DDR0_00_DLL_START_POINT_ENCODE(0xa));

	/* set as required, possibly could set up interrupt masks */
	xmtsdram(DDR0_01, DDR0_01_PLB0_DB_CS_LOWER_ENCODE(0x1) | DDR0_01_PLB0_DB_CS_UPPER_ENCODE(0));

	v = 0;
	v |= DDR0_03_INITAREF_ENCODE(0x2); /* WARNING: no idea how many autorefresh commands needed during initialisation */
	if(i2c_read(chip, SPD_BURST_LENGTHS, 1, data, 1) != 0){
		return 0;
	}
	bl = ((mt != SPD_MEMORY_TYPE_DDR2_SDRAM) && (data[0] & SPD_BURST_LENGTH_8)) ? 8 : 4;
	debug("dram: burst length caps=0x%x, chosen=%d\n", data[0], bl);
	v |= DDR0_03_BSTLEN_ENCODE((bl == 8) ? 0x3 : 0x2);
	if(i2c_read(chip, SPD_CAS_LATENCIES, 1, data, 1) != 0){
		return 0;
	}
	cl = 0;
	tmp = data[0];
	debug("dram: latency choices 0x%x\n", tmp);
	/* could use a less agressive mode by quitting for a lower x */
	for(i = 7, x = 0; (i >= 2) && (x < 3); i--){
		if(tmp & (0x1 << i)){
			debug("dram: can do cl=%d\n", i);
			if(i2c_read(chip, map[x] + 1, 1, data, 1) != 0){
				return 0;
			}
			t = ps2cycles(speed, (((data[0] >> 4) & 0xf) * 100) + ((data[0] & 0xf) * 10), "minclock");
			if(t > 0){
				debug("dram: clock too fast for cl-%d\n", x);
				break;
			}
			cl = i;
			x++;
		}
	}
Пример #19
0
static void program_ecc_addr(unsigned long start_address,
			     unsigned long num_bytes,
			     unsigned long tlb_word2_i_value)
{
	unsigned long current_address;
	unsigned long end_address;
	unsigned long address_increment;
	unsigned long mcopt1;
	char str[] = "ECC generation -";
	char slash[] = "\\|/-\\|/-";
	int loop = 0;
	int loopi = 0;

	current_address = start_address;
	mfsdram(SDRAM_MCOPT1, mcopt1);
	if ((mcopt1 & SDRAM_MCOPT1_MCHK_MASK) != SDRAM_MCOPT1_MCHK_NON) {
		mtsdram(SDRAM_MCOPT1,
			(mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_GEN);
		sync();
		eieio();
		wait_ddr_idle();

		puts(str);

#ifdef CONFIG_440
		if (tlb_word2_i_value == TLB_WORD2_I_ENABLE) {
#endif
			/* ECC bit set method for non-cached memory */
			if ((mcopt1 & SDRAM_MCOPT1_DMWD_MASK) == SDRAM_MCOPT1_DMWD_32)
				address_increment = 4;
			else
				address_increment = SDRAM_DATA_ALT_WIDTH;
			end_address = current_address + num_bytes;

			while (current_address < end_address) {
				*((unsigned long *)current_address) = 0;
				current_address += address_increment;

				if ((loop++ % (2 << 20)) == 0) {
					putc('\b');
					putc(slash[loopi++ % 8]);
				}
			}
#ifdef CONFIG_440
		} else {
			/* ECC bit set method for cached memory */
			dcbz_area(start_address, num_bytes);
			/* Write modified dcache lines back to memory */
			clean_dcache_range(start_address, start_address + num_bytes);
		}
#endif /* CONFIG_440 */

		blank_string(strlen(str));

		sync();
		eieio();
		wait_ddr_idle();

		/* clear ECC error repoting registers */
		mtsdram(SDRAM_ECCES, 0xffffffff);
		mtdcr(0x4c, 0xffffffff);

		mtsdram(SDRAM_MCOPT1,
			(mcopt1 & ~SDRAM_MCOPT1_MCHK_MASK) | SDRAM_MCOPT1_MCHK_CHK_REP);
		sync();
		eieio();
		wait_ddr_idle();
	}
}
Пример #20
0
static void denali_sdram_register_dump(void)
{
	unsigned int sdram_data;

	printf("\n  Register Dump:\n");
	mfsdram(DDR0_00, sdram_data);
	printf("        DDR0_00 = 0x%08X", sdram_data);
	mfsdram(DDR0_01, sdram_data);
	printf("        DDR0_01 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_02, sdram_data);
	printf("        DDR0_02 = 0x%08X", sdram_data);
	mfsdram(DDR0_03, sdram_data);
	printf("        DDR0_03 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_04, sdram_data);
	printf("        DDR0_04 = 0x%08X", sdram_data);
	mfsdram(DDR0_05, sdram_data);
	printf("        DDR0_05 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_06, sdram_data);
	printf("        DDR0_06 = 0x%08X", sdram_data);
	mfsdram(DDR0_07, sdram_data);
	printf("        DDR0_07 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_08, sdram_data);
	printf("        DDR0_08 = 0x%08X", sdram_data);
	mfsdram(DDR0_09, sdram_data);
	printf("        DDR0_09 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_10, sdram_data);
	printf("        DDR0_10 = 0x%08X", sdram_data);
	mfsdram(DDR0_11, sdram_data);
	printf("        DDR0_11 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_12, sdram_data);
	printf("        DDR0_12 = 0x%08X", sdram_data);
	mfsdram(DDR0_14, sdram_data);
	printf("        DDR0_14 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_17, sdram_data);
	printf("        DDR0_17 = 0x%08X", sdram_data);
	mfsdram(DDR0_18, sdram_data);
	printf("        DDR0_18 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_19, sdram_data);
	printf("        DDR0_19 = 0x%08X", sdram_data);
	mfsdram(DDR0_20, sdram_data);
	printf("        DDR0_20 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_21, sdram_data);
	printf("        DDR0_21 = 0x%08X", sdram_data);
	mfsdram(DDR0_22, sdram_data);
	printf("        DDR0_22 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_23, sdram_data);
	printf("        DDR0_23 = 0x%08X", sdram_data);
	mfsdram(DDR0_24, sdram_data);
	printf("        DDR0_24 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_25, sdram_data);
	printf("        DDR0_25 = 0x%08X", sdram_data);
	mfsdram(DDR0_26, sdram_data);
	printf("        DDR0_26 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_27, sdram_data);
	printf("        DDR0_27 = 0x%08X", sdram_data);
	mfsdram(DDR0_28, sdram_data);
	printf("        DDR0_28 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_31, sdram_data);
	printf("        DDR0_31 = 0x%08X", sdram_data);
	mfsdram(DDR0_32, sdram_data);
	printf("        DDR0_32 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_33, sdram_data);
	printf("        DDR0_33 = 0x%08X", sdram_data);
	mfsdram(DDR0_34, sdram_data);
	printf("        DDR0_34 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_35, sdram_data);
	printf("        DDR0_35 = 0x%08X", sdram_data);
	mfsdram(DDR0_36, sdram_data);
	printf("        DDR0_36 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_37, sdram_data);
	printf("        DDR0_37 = 0x%08X", sdram_data);
	mfsdram(DDR0_38, sdram_data);
	printf("        DDR0_38 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_39, sdram_data);
	printf("        DDR0_39 = 0x%08X", sdram_data);
	mfsdram(DDR0_40, sdram_data);
	printf("        DDR0_40 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_41, sdram_data);
	printf("        DDR0_41 = 0x%08X", sdram_data);
	mfsdram(DDR0_42, sdram_data);
	printf("        DDR0_42 = 0x%08X\n", sdram_data);
	mfsdram(DDR0_43, sdram_data);
	printf("        DDR0_43 = 0x%08X", sdram_data);
	mfsdram(DDR0_44, sdram_data);
	printf("        DDR0_44 = 0x%08X\n", sdram_data);
}
Пример #21
0
/*-----------------------------------------------------------------------------
 * Function:	 initdram
 * Description:  Configures SDRAM memory banks for DDR operation.
 *		 Auto Memory Configuration option reads the DDR SDRAM EEPROMs
 *		 via the IIC bus and then configures the DDR SDRAM memory
 *		 banks appropriately. If Auto Memory Configuration is
 *		 not used, it is assumed that no DIMM is plugged
 *-----------------------------------------------------------------------------*/
phys_size_t initdram(int board_type)
{
	unsigned char const iic0_dimm_addr[] = SPD_EEPROM_ADDRESS;
	unsigned long dimm_ranks[MAXDIMMS];
	unsigned long ranks;
	unsigned long rows;
	unsigned long banks;
	unsigned long cols;
	unsigned long width;
	unsigned long const sdram_freq = get_bus_freq(0);
	unsigned long const num_dimm_banks = sizeof(iic0_dimm_addr);	/* on board dimm banks */
	unsigned long cas_latency = 0;	/* to quiet initialization warning */
	unsigned long dram_size;

	debug("\nEntering initdram()\n");

	/*------------------------------------------------------------------
	 * Stop the DDR-SDRAM controller.
	 *-----------------------------------------------------------------*/
	mtsdram(DDR0_02, DDR0_02_START_ENCODE(0));

	/*
	 * Make sure I2C controller is initialized
	 * before continuing.
	 */
	/* switch to correct I2C bus */
	I2C_SET_BUS(CONFIG_SYS_SPD_BUS_NUM);
	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);

	/*------------------------------------------------------------------
	 * Clear out the serial presence detect buffers.
	 * Perform IIC reads from the dimm.  Fill in the spds.
	 * Check to see if the dimm slots are populated
	 *-----------------------------------------------------------------*/
	get_spd_info(dimm_ranks, &ranks, iic0_dimm_addr, num_dimm_banks);

	/*------------------------------------------------------------------
	 * Check the frequency supported for the dimms plugged.
	 *-----------------------------------------------------------------*/
	check_frequency(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);

	/*------------------------------------------------------------------
	 * Check and get size information.
	 *-----------------------------------------------------------------*/
	get_dimm_size(dimm_ranks, iic0_dimm_addr, num_dimm_banks, &rows, &banks,
		      &cols, &width);

	/*------------------------------------------------------------------
	 * Check the voltage type for the dimms plugged.
	 *-----------------------------------------------------------------*/
	check_voltage_type(dimm_ranks, iic0_dimm_addr, num_dimm_banks);

	/*------------------------------------------------------------------
	 * Program registers for SDRAM controller.
	 *-----------------------------------------------------------------*/
	mtsdram(DDR0_00, DDR0_00_DLL_INCREMENT_ENCODE(0x19) |
		DDR0_00_DLL_START_POINT_DECODE(0x0A));

	mtsdram(DDR0_01, DDR0_01_PLB0_DB_CS_LOWER_ENCODE(0x01) |
		DDR0_01_PLB0_DB_CS_UPPER_ENCODE(0x00) |
		DDR0_01_INT_MASK_ENCODE(0xFF));

	program_ddr0_03(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq,
			rows, &cas_latency);

	program_ddr0_04(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);

	program_ddr0_05(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);

	program_ddr0_06(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);

	/*
	 * TODO: tFAW not found in SPD.  Value of 13 taken from Sequoia
	 * board SDRAM, but may be overly conservative.
	 */
	mtsdram(DDR0_07, DDR0_07_NO_CMD_INIT_ENCODE(0) |
		DDR0_07_TFAW_ENCODE(13) |
		DDR0_07_AUTO_REFRESH_MODE_ENCODE(1) |
		DDR0_07_AREFRESH_ENCODE(0));

	mtsdram(DDR0_08, DDR0_08_WRLAT_ENCODE(cas_latency - 1) |
		DDR0_08_TCPD_ENCODE(200) | DDR0_08_DQS_N_EN_ENCODE(0) |
		DDR0_08_DDRII_ENCODE(1));

	mtsdram(DDR0_09, DDR0_09_OCD_ADJUST_PDN_CS_0_ENCODE(0x00) |
		DDR0_09_RTT_0_ENCODE(0x1) |
		DDR0_09_WR_DQS_SHIFT_BYPASS_ENCODE(0x1D) |
		DDR0_09_WR_DQS_SHIFT_ENCODE(DQS_OUT_SHIFT - 0x20));

	program_ddr0_10(dimm_ranks, ranks);

	program_ddr0_11(sdram_freq);

	mtsdram(DDR0_12, DDR0_12_TCKE_ENCODE(3));

	mtsdram(DDR0_14, DDR0_14_DLL_BYPASS_MODE_ENCODE(0) |
		DDR0_14_REDUC_ENCODE(width <= 40 ? 1 : 0) |
		DDR0_14_REG_DIMM_ENABLE_ENCODE(0));

	mtsdram(DDR0_17, DDR0_17_DLL_DQS_DELAY_0_ENCODE(DLL_DQS_DELAY));

	mtsdram(DDR0_18, DDR0_18_DLL_DQS_DELAY_4_ENCODE(DLL_DQS_DELAY) |
		DDR0_18_DLL_DQS_DELAY_3_ENCODE(DLL_DQS_DELAY) |
		DDR0_18_DLL_DQS_DELAY_2_ENCODE(DLL_DQS_DELAY) |
		DDR0_18_DLL_DQS_DELAY_1_ENCODE(DLL_DQS_DELAY));

	mtsdram(DDR0_19, DDR0_19_DLL_DQS_DELAY_8_ENCODE(DLL_DQS_DELAY) |
		DDR0_19_DLL_DQS_DELAY_7_ENCODE(DLL_DQS_DELAY) |
		DDR0_19_DLL_DQS_DELAY_6_ENCODE(DLL_DQS_DELAY) |
		DDR0_19_DLL_DQS_DELAY_5_ENCODE(DLL_DQS_DELAY));

	mtsdram(DDR0_20, DDR0_20_DLL_DQS_BYPASS_3_ENCODE(DLL_DQS_BYPASS) |
		DDR0_20_DLL_DQS_BYPASS_2_ENCODE(DLL_DQS_BYPASS) |
		DDR0_20_DLL_DQS_BYPASS_1_ENCODE(DLL_DQS_BYPASS) |
		DDR0_20_DLL_DQS_BYPASS_0_ENCODE(DLL_DQS_BYPASS));

	mtsdram(DDR0_21, DDR0_21_DLL_DQS_BYPASS_7_ENCODE(DLL_DQS_BYPASS) |
		DDR0_21_DLL_DQS_BYPASS_6_ENCODE(DLL_DQS_BYPASS) |
		DDR0_21_DLL_DQS_BYPASS_5_ENCODE(DLL_DQS_BYPASS) |
		DDR0_21_DLL_DQS_BYPASS_4_ENCODE(DLL_DQS_BYPASS));

	program_ddr0_22(dimm_ranks, iic0_dimm_addr, num_dimm_banks, width);

	mtsdram(DDR0_23, DDR0_23_ODT_RD_MAP_CS0_ENCODE(0x0) |
		DDR0_23_FWC_ENCODE(0));

	program_ddr0_24(ranks);

	program_ddr0_26(sdram_freq);

	program_ddr0_27(sdram_freq);

	mtsdram(DDR0_28, DDR0_28_EMRS3_DATA_ENCODE(0x0000) |
		DDR0_28_EMRS2_DATA_ENCODE(0x0000));

	mtsdram(DDR0_31, DDR0_31_XOR_CHECK_BITS_ENCODE(0x0000));

	mtsdram(DDR0_42, DDR0_42_ADDR_PINS_DECODE(14 - rows) |
		DDR0_42_CASLAT_LIN_GATE_ENCODE(2 * cas_latency));

	program_ddr0_43(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq,
			cols, banks);

	program_ddr0_44(dimm_ranks, iic0_dimm_addr, num_dimm_banks, sdram_freq);

	denali_sdram_register_dump();

	dram_size = (width >= 64) ? 8 : 4;
	dram_size *= 1 << cols;
	dram_size *= banks;
	dram_size *= 1 << rows;
	dram_size *= ranks;
	debug("dram_size = %lu\n", dram_size);

	/* Start the SDRAM controler */
	mtsdram(DDR0_02, DDR0_02_START_ENCODE(1));
	denali_wait_for_dlllock();

#if defined(CONFIG_DDR_DATA_EYE)
	/*
	 * Map the first 1 MiB of memory in the TLB, and perform the data eye
	 * search.
	 */
	program_tlb(0, CONFIG_SYS_SDRAM_BASE, TLB_1MB_SIZE, TLB_WORD2_I_ENABLE);
	denali_core_search_data_eye();
	denali_sdram_register_dump();
	remove_tlb(CONFIG_SYS_SDRAM_BASE, TLB_1MB_SIZE);
#endif

#if defined(CONFIG_ZERO_SDRAM) || defined(CONFIG_DDR_ECC)
	program_tlb(0, CONFIG_SYS_SDRAM_BASE, dram_size, 0);
	sync();
	/* Zero the memory */
	debug("Zeroing SDRAM...");
#if defined(CONFIG_SYS_MEM_TOP_HIDE)
	dcbz_area(CONFIG_SYS_SDRAM_BASE, dram_size - CONFIG_SYS_MEM_TOP_HIDE);
#else
#error Please define CONFIG_SYS_MEM_TOP_HIDE (see README) in your board config file
#endif
	/* Write modified dcache lines back to memory */
	clean_dcache_range(CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_SDRAM_BASE + dram_size - CONFIG_SYS_MEM_TOP_HIDE);
	debug("Completed\n");
	sync();
	remove_tlb(CONFIG_SYS_SDRAM_BASE, dram_size);

#if defined(CONFIG_DDR_ECC)
	/*
	 * If ECC is enabled, clear and enable interrupts
	 */
	if (is_ecc_enabled()) {
		u32 val;

		sync();
		/* Clear error status */
		mfsdram(DDR0_00, val);
		mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);
		/* Set 'int_mask' parameter to functionnal value */
		mfsdram(DDR0_01, val);
		mtsdram(DDR0_01, (val & ~DDR0_01_INT_MASK_MASK) |
			DDR0_01_INT_MASK_ALL_OFF);
#if defined(CONFIG_DDR_DATA_EYE)
		/*
		 * Running denali_core_search_data_eye() when ECC is enabled
		 * causes non-ECC machine checks.  This clears them.
		 */
		print_mcsr();
		mtspr(SPRN_MCSR, mfspr(SPRN_MCSR));
		print_mcsr();
#endif
		sync();
	}
#endif /* defined(CONFIG_DDR_ECC) */
#endif /* defined(CONFIG_ZERO_SDRAM) || defined(CONFIG_DDR_ECC) */

	program_tlb(0, CONFIG_SYS_SDRAM_BASE, dram_size, MY_TLB_WORD2_I_ENABLE);
	return dram_size;
}
Пример #22
0
static void program_ecc(u32 start_address,
			u32 num_bytes,
			u32 tlb_word2_i_value)
{
	u32 current_address;
	u32 end_address;
	u32 address_increment;
	u32 val;
	char str[] = "ECC generation -";
	char slash[] = "\\|/-\\|/-";
	int loop = 0;
	int loopi = 0;

	current_address = start_address;

	sync();
	eieio();
	wait_ddr_idle();

	if (tlb_word2_i_value == TLB_WORD2_I_ENABLE) {
		/* ECC bit set method for non-cached memory */
		address_increment = 4;
		end_address = current_address + num_bytes;

		puts(str);

		while (current_address < end_address) {
			*((u32 *)current_address) = 0x00000000;
			current_address += address_increment;

			if ((loop++ % (2 << 20)) == 0) {
				putc('\b');
				putc(slash[loopi++ % 8]);
			}
		}

		blank_string(strlen(str));
	} else {
		/* ECC bit set method for cached memory */
#if 0 /* test-only: will remove this define later, when ECC problems are solved! */
		/*
		 * Some boards (like lwmon5) need to preserve the memory
		 * content upon ECC generation (for the log-buffer).
		 * Therefore we don't fill the memory with a pattern or
		 * just zero it, but write the same values back that are
		 * already in the memory cells.
		 */
		address_increment = CFG_CACHELINE_SIZE;
		end_address = current_address + num_bytes;

		current_address = start_address;
		while (current_address < end_address) {
			/*
			 * TODO: Th following sequence doesn't work correctly.
			 * Just invalidating and flushing the cache doesn't
			 * seem to trigger the re-write of the memory.
			 */
			ppcDcbi(current_address);
			ppcDcbf(current_address);
			current_address += CFG_CACHELINE_SIZE;
		}
#else
		dcbz_area(start_address, num_bytes);
		dflush();
#endif
	}

	sync();
	eieio();
	wait_ddr_idle();

	/* Clear error status */
	mfsdram(DDR0_00, val);
	mtsdram(DDR0_00, val | DDR0_00_INT_ACK_ALL);

	/* Set 'int_mask' parameter to functionnal value */
	mfsdram(DDR0_01, val);
	mtsdram(DDR0_01, ((val &~ DDR0_01_INT_MASK_MASK) | DDR0_01_INT_MASK_ALL_OFF));

	sync();
	eieio();
	wait_ddr_idle();
}