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#ifndef CYGONCE_HAL_PLATFORM_SETUP_H

#define CYGONCE_HAL_PLATFORM_SETUP_H

/*=============================================================================

//

//      hal_platform_setup.h

//

//      Platform specific support for HAL (assembly code)

//

//=============================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos 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 or (at your option) any later version.

//

// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//=============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    msalter

// Contributors: msalter

// Date:         2001-12-03

// Purpose:      Intel XScale IQ80321 platform specific support routines

// Description:

// Usage:        #include <cyg/hal/hal_platform_setup.h>

//     Only used by "vectors.S"

//

//####DESCRIPTIONEND####

//

//===========================================================================*/

#include <pkgconf/system.h>             // System-wide configuration info

#include CYGBLD_HAL_VARIANT_H           // Variant specific configuration

#include CYGBLD_HAL_PLATFORM_H          // Platform specific configuration

#include <cyg/hal/hal_verde.h>          // Variant specific hardware definitions

#include <cyg/hal/hal_mmu.h>            // MMU definitions

#include <cyg/hal/hal_mm.h>             // more MMU definitions

#include <cyg/hal/iq80321.h>            // Platform specific hardware definitions

#include <cyg/hal/hal_spd.h>

#if defined(CYG_HAL_STARTUP_ROM)

#define PLATFORM_SETUP1  _platform_setup1

#define PLATFORM_EXTRAS  <cyg/hal/hal_platform_extras.h>

#define CYGHWR_HAL_ARM_HAS_MMU

.macro  NOPs count

        .rept \count

        nop

        nop

        .endr

.endm

// ------------------------------------------------------------------------

// Define macro used to diddle the LEDs during early initialization.

// Can use r0+r1.  Argument in \x.

#define CYGHWR_LED_MACRO                                     \

        b       667f                                        ;\

   666:                                                     ;\

        .byte   DISPLAY_0, DISPLAY_1, DISPLAY_2, DISPLAY_3  ;\

        .byte   DISPLAY_4, DISPLAY_5, DISPLAY_6, DISPLAY_7  ;\

        .byte   DISPLAY_8, DISPLAY_9, DISPLAY_A, DISPLAY_B  ;\

        .byte   DISPLAY_C, DISPLAY_D, DISPLAY_E, DISPLAY_F  ;\

   667:                                                     ;\

        ldr     r0, =666b                                   ;\

        add     r0, r0, #\x                                 ;\

        ldrb    r1, [r0]                                    ;\

        ldr     r0, =DISPLAY_RIGHT                          ;\

        str     r1, [r0]

#define PAUSE                            \

        ldr     r1,=0x8000;              \

  555:  sub     r1,r1,#1;                \

        cmp     r1,#0;                   \

        bne     555b;

#define DCACHE_SIZE (32 * 1024)

// ------------------------------------------------------------------------

// MCU Register Values

// ------------------------------------------------------------------------

// This macro represents the initial startup code for the platform        

        .macro _platform_setup1

        // This is where we wind up immediately after reset. At this point, we

        // are executing from the boot address (0x00000000), not the eventual

        // flash address. Do some basic setup using position independent code

        // then switch to real flash address

// FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME 

// This is a quick and dirty workaround to an apparent gas/ld

// bug. The computed UNMAPPED_PTR(reset_vector) is off by 0x20.

        .rept 0x20/4

        nop

        .endr

// FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME FIXME 

        ldr     r0,=(CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_SUPERVISOR_MODE)

        msr     cpsr, r0

        // enable coprocessor access

        ldr     r0, =0x20c1              // CP13,CP7,CP6,CP0

        mcr     p15, 0, r0, c15, c1, 0

        // Drain write and fill buffer

        mcr     p15, 0, r0, c7, c10, 4

        CPWAIT  r0

        // Setup PBIU chip selects

        ldr     r8, =PBIU_PBCR

        ldr     r2, =PBLR_SZ_4K

        ldr     r1, =IQ80321_UART_ADDR | PBAR_FLASH | PBAR_RCWAIT_20 | PBAR_ADWAIT_20 | PBAR_BUS_8

        str     r1, [r8, #0x10]  // PBIU_PBAR1

        str     r2, [r8, #0x14]  // PBIU_PBLR1

        ldr     r1, =IQ80321_DISPLAY_RIGHT_ADDR | PBAR_FLASH | PBAR_RCWAIT_20 | PBAR_ADWAIT_20 | PBAR_BUS_32

        str     r1, [r8, #0x18]  // PBIU_PBAR2

        str     r2, [r8, #0x1C]  // PBIU_PBLR2

        ldr     r1, =IQ80321_DISPLAY_LEFT_ADDR | PBAR_FLASH | PBAR_RCWAIT_20 | PBAR_ADWAIT_20 | PBAR_BUS_32

        str     r1, [r8, #0x20]  // PBIU_PBAR3

        str     r2, [r8, #0x24]  // PBIU_PBLR3

        ldr     r1, =IQ80321_ROTARY_SWITCH_ADDR | PBAR_FLASH | PBAR_RCWAIT_20 | PBAR_ADWAIT_20 | PBAR_BUS_32

        str     r1, [r8, #0x28]  // PBIU_PBAR4

        str     r2, [r8, #0x2C]  // PBIU_PBLR4

        ldr     r1, =IQ80321_BATTERY_STATUS_ADDR | PBAR_FLASH | PBAR_RCWAIT_20 | PBAR_ADWAIT_20 | PBAR_BUS_32

        str     r1, [r8, #0x30]  // PBIU_PBAR5

        str     r2, [r8, #0x34]  // PBIU_PBLR5

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_A, DISPLAY_1

        // ====================================================================

        // Enable the Icache

        mrc     p15, 0, r0, c1, c0, 0

        orr     r0, r0, #MMU_Control_I

        mcr     p15, 0, r0, c1, c0, 0

        CPWAIT  r0

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_A, DISPLAY_2

        // ====================================================================

        // value to write into PBIU_PBAR0 to establish runtime flash address

        ldr     r1, =IQ80321_FLASH_ADDR | PBAR_FLASH | PBAR_RCWAIT_20 | PBAR_ADWAIT_20 | PBAR_BUS_16

        // value to write into PBIU_PBLR0 to establish runtime flash address

        ldr     r2, =PBLR_SZ_8M

        // value to load into pc to jump to real runtime address

        ldr     r7, =1f

        ldr     r9, =IQ80321_DISPLAY_RIGHT_ADDR

        ldr     r10,=IQ80321_DISPLAY_LEFT_ADDR

        ldr     r11,=DISPLAY_F

        b       icache_boundary

        .p2align 5

icache_boundary:

        // Here is where we switch from boot address (0x000000000) to the

        // actual flash runtime address. We align to cache boundary so we

        // execute from cache during the switchover. Cachelines are 8 words.

        str     r1, [r8, #0x08]  // PBIU_PBAR0

        str     r2, [r8, #0x0c]  // PBIU_PBLR0

        nop

        nop

        mov     pc, r7

        str     r11, [r9]    // We should never reach this point. If we do,

        str     r11, [r10]   // display FF and loop forever.

    0:  b       0b

    1:

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_A, DISPLAY_3

        // ====================================================================

        // Set the TTB register

        ldr     r0, =mmu_table

        mcr     p15, 0, r0, c2, c0, 0

        // Enable permission checks in all domains

        ldr     r0, =0x55555555

        mcr     p15, 0, r0, c3, c0, 0

        // Enable the MMU

        mrc     p15, 0, r0, c1, c0, 0

        orr     r0, r0, #MMU_Control_M

        orr     r0, r0, #MMU_Control_R

        mcr     p15, 0, r0, c1, c0, 0

        CPWAIT  r0

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_A, DISPLAY_4

        // ====================================================================

        //

        // ***  I2C interface initialization ***

        //

        // Pointers to I2C Registers

        ldr     r11, =I2C_ICR0          // address of the I2C Control Register in r11.

        ldr     r12, =I2C_ISR0          // address of the I2C Status Register in r12.

        ldr     r13, =I2C_IDBR0         // address of the I2C Data Buffer Register in r13.

        //  Write 0 to avoid interfering with I2C bus.

        //  (See GPIO section in 80321 manual)

        ldr     r2, =GPIO_GPOD

        mov     r3, #0

        strb    r3, [r2]

        // Reset I2C Unit

        mov     r1, #ICR_RESET

        str     r1, [r11]

        ldr     r1, =0x7ff

        str     r1, [r12]

        mov     r1, #0

        str     r1, [r11]

        //  Setup I2C Slave Address Register

        ldr     r2, =I2C_ISAR0          // Load address of the I2C Slave Address Register in r2.

        mov     r1, #I2C_DEVID          // Load slave address r1.

        str     r1, [r2]                // Save the value 0x02 (I2C_DEVID) in the register.

        //  Enable I2C Interface Unit - status will be polled

        ldr     r1, =ICR_GCALL | ICR_ENB | ICR_SCLENB

        str     r1, [r11]

        //

        //  *** Now read the SPD Data ***

        //

        // Initialize regs for loop

        mov     r4, #0          // SDRAM size

        mov     r5, #0          // R5 has running checksum calculation

        mov     r6, #0          // Counter incremented before byte is read

        mov     r7, #64         // Number of bytes to read in the Presence Detect EEPROM of SDRAM

        mov     r8, #0          // Flags: b0-b6 == bankcnt, b7 = x16 flag

        mov     r9, #RFR_15_6us // Refresh rate (assume normal 15.6us)

        mov     r10, #0         // Bank size

        mov     r14, #0         // ECC flag

        ldr     r0, [r12]               // Load I2C Status Reg into R0

        str     r0, [r12]               // Clear status

        /*  FREE REGISTERS ARE R0 - R3 */

        // *** Put out address, with WRITE mode ***

        // Set SDRAM module address and write mode

        mov     r1, #SDRAM_DEVID        // Load slave address for SDRAM module. 0xA2 (Presence Detect Data)

        bic     r1, r1, #IDBR_MODE      // Clear read bit (bit #0)

        str     r1, [r13]               // Store to data register

        // Initiate dummy write to set EEPROM pointer to 0

        ldr     r1, [r11]               // read the current Control Register value

        bic     r1, r1, #ICR_STOP       // No stop bit

        orr     r1, r1, #ICR_START | ICR_TRANSFER

        str     r1, [r11]               // Store to control register

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_9, DISPLAY_0

        // ====================================================================

        // Wait for transmit empty status

        mov     r1, #I2C_TIMOUT         // Initialize I2C timeout counter

    0:   subs    r1, r1, #1              // Increment I2C timeout counter (r1 = r1 + 1)

        beq     i2c_error               // Kick out of SDRAM initialization if timeout occurs

        ldr     r0, [r12]               // Load I2C Status Reg into R0

        ands    r3, r0, #ISR_EMPTY      // Bit #6 is checked, IDBR Transmit Empty

        beq     0b                      // If bit = 0 then branch to 0 and check again

        str     r0, [r12]               // Write back status to clear

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_9, DISPLAY_1

        // ====================================================================

        // Write pointer register on EEPROM to 0x00000000

        mov     r1, #0                  // Load base address of SDRAM module EEPROM

        str     r1, [r13]               // Store to data register

        //  Send address to EEPROM

        ldr     r1, [r11]               // read the current Control Register value

        bic     r1, r1, #ICR_START | ICR_STOP

        orr     r1, r1, #ICR_TRANSFER   // Set transfer bit - bit is self_clearing

        str     r1, [r11]               // Store to control register

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_9, DISPLAY_2

        // ====================================================================

        // Wait for transmit empty status

        mov     r1, #I2C_TIMOUT         // Initialize I2C timeout counter

    0:   subs    r1, r1, #1              // Increment I2C timeout counter (r1 = r1 + 1)

        beq     i2c_error               // Kick out of SDRAM initialization if timeout occurs

        ldr     r0, [r12]               // Load I2C Status Reg into R0 -  ld    (r12), r10

        ands    r3, r0, #ISR_EMPTY      // Bit #6 is checked, IDBR Transmit Empty

        beq     0b                      // If bit = 0 then branch to 0 and check again

        str     r0, [r12]               // Write back status to clear

1:

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_9, DISPLAY_3

        // ====================================================================

        // *** Read SDRAM PD data ***

        // *** Put out address, with READ mode ***

        //  Set SDRAM module address and read mode

        mov     r0, #SDRAM_DEVID        // Load slave address for SDRAM module (0xA2)

        orr     r1, r0, #IDBR_MODE      // Set read bit (bit #0)

        str     r1, [r13]               // Store to data register

        //  Send next read request

        ldr     r1, [r11]               // read the current Control Register value

        bic     r1, r1, #ICR_STOP       // No stop bit

        orr     r1, r1, #ICR_START | ICR_TRANSFER

        str     r1, [r11]               // Store to control register

        // Wait for transmit empty status

        mov     r1, #I2C_TIMOUT         // Initialize I2C timeout counter

    0:   subs    r1, r1, #1              // Increment I2C timeout counter (r1 = r1 + 1)

        beq     i2c_error               // Kick out of SDRAM initialization if timeout occurs

        ldr     r0, [r12]               // Load I2C Status Reg into R0 -  ld    (r12), r10

        ands    r3, r0, #ISR_EMPTY      // Bit #6 is checked, IDBR Transmit Empty

        beq     0b                      // If bit = 0 then branch to 0 and check again

        str     r0, [r12]               // Write back status to clear

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_9, DISPLAY_4

        // ====================================================================

  spd_loop:

        // read the next Byte of Serial Presence Detect data

        ldr     r1, [r11]               // read the current Control Register value

        bic     r1, r1, #ICR_START      // No start bit (already started)

        orr     r1, r1, #ICR_TRANSFER   // Set transfer bit - bit is self_clearing

        // we have to set NACK before reading the last byte

        add     r2, r6, #1

        cmp     r2, r7                  // r7 = 64 (decimal) so if r6 = 64, this is the last byte to be read

        orreq   r1, r1, #ICR_ACK | ICR_STOP

        str     r1, [r11]               // Store to control register

        // Wait for read full status

        mov     r1, #I2C_TIMOUT         // Initialize I2C timeout counter

    0:   subs    r1, r1, #1              // decrement timeout

        beq     i2c_error               // Kick out of SDRAM initialization if timeout occurs

        ldr     r0, [r12]               // Load I2C Status Reg into R0

        ands    r3, r0, #ISR_FULL       // Bit #7 is checked

        beq     0b                      // If bit = 0 then branch to 0 and check again

        str     r0, [r12]               // Write back status to clear

        ldr     r1, [r13]               // Read the byte

        // check for checksum byte

        subs    r2, r6, #SPD_CHECKSUM

        addne   r5, r5, r1              // Add it to the checksum if not the checksum byte

        bne     1f                      // skip checksum comparison

        and     r5, r5, #0xff           //      against the calculated checksum

        cmp     r1, r5

        beq     spd_continue

        // bad checksum

        HEX_DISPLAY r2, r3, DISPLAY_7, DISPLAY_7

        0: b 0b

    1:

        // Check for bank count byte

        subs    r2, r6, #SPD_BANKCNT

        moveq   r8, r1                  // Store bank count

        beq     spd_continue

        // Check for ECC

        subs    r2, r6, #SPD_CONFIG

        bne     1f

        subs    r2, r1, #2

        addeq   r14, r14, #1

        b       spd_continue

    1:

        // Check for refresh rate

        subs    r2, r6, #SPD_REFRESH

        bne     1f

        ands    r2, r1, #0x7f

        moveq   r9, #RFR_15_6us

        subs    r3, r2, #1

        moveq   r9, #RFR_3_9us

        subs    r3, r2, #2

        moveq   r9, #RFR_7_8us

        b       spd_continue

    1:

        // Check for SDRAM width byte

        subs    r2, r6, #SPD_SDRAM_WIDTH

        bne     1f

        ands    r2, r1, #0x10           // Check for data width of 16

        orr     r8, r8, r2, lsl #3      // set b7 in r8 if x16

#if 0 // drive strength doesn't depend on width

        ldreq   r2, =x8_table           // x8 if bit not set

        ldrne   r2, =x16_table          // x16 if bit not set

        b       init_drive_strength

    x16_table:

        .word   0x18    // Data Bus Pull Up

        .word   0x18    // Data Bus Pull Down

        .word   0x22    // Clock Pull Up

        .word   0x20    // Clock Pull Down

        .word   0x30    // Clock Enable Pull Up

        .word   0x30    // Clock Enable Pull Down

        .word   0x30    // Chip Select Pull Up

        .word   0x30    // Chip Select Pull Down

        .word   0x18    // Receive Enable Pull Up

        .word   0x18    // Receive Enable Pull Down

        .word   0x3c    // Address Bus Pull Up

        .word   0x3c    // Address Bus Pull Down

    x8_table:

        .word   0x18    // Data Bus Pull Up

        .word   0x18    // Data Bus Pull Down

        .word   0x22    // Clock Pull Up

        .word   0x20    // Clock Pull Down

        .word   0x30    // Clock Enable Pull Up

        .word   0x30    // Clock Enable Pull Down

        .word   0x30    // Chip Select Pull Up

        .word   0x30    // Chip Select Pull Down

        .word   0x18    // Receive Enable Pull Up

        .word   0x18    // Receive Enable Pull Down

        .word   0x3c    // Address Bus Pull Up

        .word   0x3c    // Address Bus Pull Down

#else

        b       spd_continue

    registered_table:

        .word   13      // Data Bus Pull Up

        .word   13      // Data Bus Pull Down

        .word   34      // Clock Pull Up

        .word   32      // Clock Pull Down

        .word   48      // Clock Enable Pull Up

        .word   48      // Clock Enable Pull Down

        .word   13      // Chip Select Pull Up

        .word   13      // Chip Select Pull Down

        .word   13      // Receive Enable Pull Up

        .word   13      // Receive Enable Pull Down

        .word   13      // Address Bus Pull Up

        .word   13      // Address Bus Pull Down

    unbuffered_table:

        .word   13      // Data Bus Pull Up

        .word   13      // Data Bus Pull Down

        .word   34      // Clock Pull Up

        .word   32      // Clock Pull Down

        .word   48      // Clock Enable Pull Up

        .word   48      // Clock Enable Pull Down

        .word   24      // Chip Select Pull Up

        .word   24      // Chip Select Pull Down

        .word   13      // Receive Enable Pull Up

        .word   13      // Receive Enable Pull Down

        .word   24      // Address Bus Pull Up

        .word   24      // Address Bus Pull Down

#endif

    init_drive_strength:

        ldr     r1, =MCU_DBUDSR

        mov     r3, #12         // 12 contiguous registers to set

    0:

        ldr     r0, [r2], #4    // load value

        str     r0, [r1], #4    // store to register

        subs    r3, r3, #1

        bne     0b

        b       spd_continue

    1:

        // Check for module attribute byte

        subs    r2, r6, #SPD_MOD_ATTRIB

        bne     1f

        ldr     r0, =MCU_SDCR

        mov     r2, #SDCR_INIT_VAL

        ands    r3, r1, #SPD_ATTRIB_REG_CTL  // check for registered modules

        beq     2f

        orr     r2, r2, #2

        str     r2, [r0]

        ldr     r2, =registered_table

        b       init_drive_strength

    2:

        str     r2, [r0]

        ldr     r2, =unbuffered_table

        b       init_drive_strength

    1:

        // Check for bank size byte

        subs    r2, r6, #SPD_BANKSZ

        bne     1f

        mov     r10, r1, lsl #2         // Store bank size in Mbytes (shift left 2 bits)

        and     r3, r8, #0x7f           // isolate bank count     

        mul     r2, r3, r10             // Multiply by bank count to get DRAM size in MB

        mov     r4, r2, lsl #20         // Convert size to bytes  - r4 contains DRAM size in bytes

        b       spd_continue

    1:

  spd_continue:

        // Continue reading bytes if not done

        add     r6, r6, #1      // Increment byte counter

        cmp     r6, r7

        bne     spd_loop

        b       i2c_disable

        .ltorg

    i2c_error:

        // hit the leds if an error occurred

        HEX_DISPLAY r2, r3, DISPLAY_5, DISPLAY_5

        b i2c_error

    i2c_disable:

        //  Disable I2C Interface Unit

        ldr     r1, [r11]

        bic     r1, r1, #ICR_ENB | ICR_SCLENB   // Disable I2C unit

        str     r1, [r11]

        // At this point, r4 = SDRAM size in bytes, r8 = Bank count, r10 = bank size in MB

        // *** SDRAM setup ***

        // Set the DDR SDRAM Base Register - SDBR (the lowest address for memory)

        ldr     r0, =MCU_SDBR

        mov     r1, #SDRAM_PHYS_BASE

        str     r1, [r0]

        // Set up bank 0 register

        subs    r1, r10, #32

        moveq   r0, #SBR_32MEG          // Program SDRAM Bank0 Boundary register to 32 MB

        beq     1f

        subs    r1, r10, #64            // do we have 64 MB banks?

        moveq   r0, #SBR_64MEG          // Program SDRAM Bank0 Boundary register to 64 MB

        beq     1f

        subs    r1, r10, #128           // do we have 128 MB banks?

        moveq   r0, #SBR_128MEG         // Program SDRAM Bank0 Boundary register to 128 MB

        beq     1f

        subs    r1, r10, #256           // do we have 256 MB banks?

        moveq   r0, #SBR_256MEG         // Program SDRAM Bank0 Boundary register to 64 MB

        beq     1f

        subs    r1, r10, #512           // do we have 512 MB banks?

        moveq   r0, #SBR_512MEG         // Program SDRAM Bank0 Boundary register to 64 MB

        beq     1f

     bank_err:

        HEX_DISPLAY r2, r3, DISPLAY_F, DISPLAY_F

        b       bank_err

    1:

        mov     r1, #SDRAM_PHYS_BASE

        mov     r2, #0x1f

        and     r2, r2, r1, lsr #25

        add     r2, r2, r0

        ands    r1, r8, #0x80

        and     r8, r8, #0x7f

        beq     1f

        // x16

        subs    r1, r10, #128

        addeq   r2, r2, #0x80000000

    1:

        ldr     r1, =MCU_SBR0

        str     r2, [r1]                // store SBR0

        subs    r1, r8, #2              // do we have 2 banks???

        addeq   r2, r2, r0              // SBR1 == SBR0+r0 if two banks

        ldr     r1, =MCU_SBR1

        str     r2, [r1]

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_A, DISPLAY_5

        // ====================================================================

        DELAY_FOR 0x1800000, r0

        //  Disable the refresh counter by setting the RFR to zero.

        // (from section 7.2.2.6 of the Verde technical specification)

        ldr     r0, =MCU_RFR

        mov     r1, #0

        str     r1, [r0]

        // Issue one NOP cycle after the 200 us device deselect. A NOP is 

        // accomplished by setting the SDIR to 0101.

        ldr     r0, =MCU_SDIR

        mov     r1, #SDIR_CMD_NOP

        str     r1, [r0]

        // Issue a precharge-all command to the DDR SDRAM interface by setting 

        // the SDIR to 0100.

        mov     r1, #SDIR_CMD_PRECHARGE_ALL

        str     r1, [r0]

        // Issue an extended-mode-register-set command to enable the DLL by 

        // writing 0110 to the SDIR.

        NOPs    8

        mov     r1, #SDIR_CMD_ENABLE_DLL

        str     r1, [r0]

        // After waiting T mrd cycles (4 clocks at 200 MHz), issue a 

        // mode-register-set command by writing to the SDIR to program the DDR 

        // SDRAM parameters and to Reset the DLL. Setting the SDIR to 0010 

        // programs the MCU for CAS Latency of two while setting the SDIR to 0011

        // programs the MCU for CAS Latency of two and one-half. The MCU supports 

        // the following DDR SDRAM mode parameters:

        //   a. CAS Latency (CL) = two or two and one-half

        //   b. Wrap Type (WT) = Sequential

        //   c. Burst Length (BL) = four

        NOPs    8

        mov     r1, #SDIR_CMD_CAS_LAT_2_A   // Set CAS Latency to 2

        str     r1, [r0]

        // After waiting T mrd cycles (4 clocks at 200 MHz), issue a precharge-all

        // command to the DDR SDRAM interface by setting the SDIR to 0100.

        NOPs    8

        mov     r1, #SDIR_CMD_PRECHARGE_ALL

        str     r1, [r0]

        // After waiting T rp cycles (4 clocks at 200 MHz), provide two 

        // auto-refresh cycles. An auto-refresh cycle is accomplished by 

        // setting the SDIR to 0111. Software must ensure at least T rfc 

        // cycles (16 clocks at 200 MHz) between each auto-refresh command.

        NOPs    8

        mov     r1, #SDIR_CMD_AUTO_REFRESH      // 1st of two auto-refresh cycle commands

        str     r1, [r0]

        NOPs    8

        str     r1, [r0]                        // 2nd of two auto-refresh cycle commands

        NOPs    8

        // Issues a mode-register-set command by writing to the SDIR to program the

        // DDR SDRAM parameters without resetting the DLL. Setting the SDIR to 0000 

        // programs the MCU for CAS Latency of two while setting the SDIR to 0001

        // programs the MCU for CAS Latency of two and one-half. The MCU supports 

        // the following DDR SDRAM mode parameters:

        //   a. CAS Latency (CL) = two or two and one-half

        //   b. Wrap Type (WT) = Sequential

        //   c. Burst Length (BL) = four

        mov     r1, #SDIR_CMD_CAS_LAT_2_B       // Set CAS Latency to 2

        str     r1, [r0]

        NOPs    8

        mov     r1, #0xF                        // DDR Normal Operation

        str     r1, [r0]

        // Re-enable the refresh counter by setting the RFR to the required value.

        //

        ldr     r0, =MCU_RFR

        str     r9, [r0]

        // DSDR   - Data Strobe Delay Register                       (Section 7.6.25)

        ldr     r0, =MCU_DSDR

        ldr     r1, =DSDR_REC_VAL

        str     r1, [r0]

        // REDR   - Receive Enable Delay Register                    (Section 7.6.26)

        ldr     r0, =MCU_REDR

        ldr     r1, =REDR_REC_VAL

        str     r1, [r0]

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_A, DISPLAY_6

        // ====================================================================

        // delay before using SDRAM 

        DELAY_FOR 0x1800000, r0

        // Enable the Dcache

        mrc     p15, 0, r0, c1, c0, 0

        orr     r0, r0, #MMU_Control_C

        mcr     p15, 0, r0, c1, c0, 0

        CPWAIT  r0

        // Enable branch target buffer

        mrc     p15, 0, r0, c1, c0, 0

        orr     r0, r0, #MMU_Control_BTB

        mcr     p15, 0, r0, c1, c0, 0

        CPWAIT  r0

        mcr     p15, 0, r0, c7, c10, 4  // drain the write & fill buffers

        CPWAIT  r0

        mcr     p15, 0, r0, c7, c7, 0   // flush Icache, Dcache and BTB

        CPWAIT  r0

        mcr     p15, 0, r0, c8, c7, 0   // flush instuction and data TLBs

        CPWAIT  r0

        mcr     p15, 0, r0, c7, c10, 4   // drain the write & fill buffers

        CPWAIT r0

        // ====================================================================

        HEX_DISPLAY r0, r1, DISPLAY_S, DISPLAY_L

        // ====================================================================

        ldr     r0, =MCU_ECTST           // clear test register

        mov     r1, #0

        str     r1, [r0]

        ldr     r0, =MCU_ECCR

        mov     r1, #0x0                 // disable ECC, disable reporting

        str     r1, [r0]

#ifdef CYGSEM_HAL_ARM_IQ80321_BATTERY_TEST

        //  Battery Backup SDRAM Memory Test

        //  Move test pattern into register prior to memory scrub

        ldr     r9, =SDRAM_BATTERY_TEST_ADDR

        ldr     r10, [r9]

#endif

        orrs    r14, r14, r14

        beq     no_ecc1

        ldr     r0, =MCU_ECCR

        mov     r1, #0x8                 // enable ECC, disable reporting

        str     r1, [r0]