arch/blackfin/mach-bf561/head.S - kernel/msm-5.4 - Gitiles

 /*
  * File:         arch/blackfin/mach-bf561/head.S
  * Based on:     arch/blackfin/mach-bf533/head.S
  * Author:
  *
  * Created:
  * Description:  BF561 startup file
  *
  * Modified:
  *               Copyright 2004-2006 Analog Devices Inc.
  *
  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  *
  * 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, see the file COPYING, or write
  * to the Free Software Foundation, Inc.,
  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */

 #include <linux/linkage.h>
 #include <linux/init.h>
 #include <asm/blackfin.h>
 #include <asm/trace.h>

 #if CONFIG_BFIN_KERNEL_CLOCK
 #include <asm/mach-common/clocks.h>
 #include <asm/mach/mem_init.h>
 #endif

 .global __rambase
 .global __ramstart
 .global __ramend
 .extern ___bss_stop
 .extern ___bss_start
 .extern _bf53x_relocate_l1_mem

 #define INITIAL_STACK	0xFFB01000

 __INIT

 ENTRY(__start)
 	/* R0: argument of command line string, passed from uboot, save it */
 	R7 = R0;
 	/* Enable Cycle Counter and Nesting Of Interrupts */
 #ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
 	R0 = SYSCFG_SNEN;
 #else
 	R0 = SYSCFG_SNEN | SYSCFG_CCEN;
 #endif
 	SYSCFG = R0;
 	R0 = 0;

 	/* Clear Out All the data and pointer Registers */
 	R1 = R0;
 	R2 = R0;
 	R3 = R0;
 	R4 = R0;
 	R5 = R0;
 	R6 = R0;

 	P0 = R0;
 	P1 = R0;
 	P2 = R0;
 	P3 = R0;
 	P4 = R0;
 	P5 = R0;

 	LC0 = r0;
 	LC1 = r0;
 	L0 = r0;
 	L1 = r0;
 	L2 = r0;
 	L3 = r0;

 	/* Clear Out All the DAG Registers */
 	B0 = r0;
 	B1 = r0;
 	B2 = r0;
 	B3 = r0;

 	I0 = r0;
 	I1 = r0;
 	I2 = r0;
 	I3 = r0;

 	M0 = r0;
 	M1 = r0;
 	M2 = r0;
 	M3 = r0;

 	trace_buffer_init(p0,r0);
 	P0 = R1;
 	R0 = R1;

 	/* Turn off the icache */
 	p0.l = LO(IMEM_CONTROL);
 	p0.h = HI(IMEM_CONTROL);
 	R1 = [p0];
 	R0 = ~ENICPLB;
 	R0 = R0 & R1;

 #if ANOMALY_05000125
 	CLI R2;
 	SSYNC;
 #endif
 	[p0] = R0;
 	SSYNC;
 #if ANOMALY_05000125
 	STI R2;
 #endif

 	/* Turn off the dcache */
 	p0.l = LO(DMEM_CONTROL);
 	p0.h = HI(DMEM_CONTROL);
 	R1 = [p0];
 	R0 = ~ENDCPLB;
 	R0 = R0 & R1;

 	/* Anomaly 05000125 */
 #if ANOMALY_05000125
 	CLI R2;
 	SSYNC;
 #endif
 	[p0] = R0;
 	SSYNC;
 #if ANOMALY_05000125
 	STI R2;
 #endif

 	/* Initialise UART - when booting from u-boot, the UART is not disabled
 	 * so if we dont initalize here, our serial console gets hosed */
 	p0.h = hi(BFIN_UART_LCR);
 	p0.l = lo(BFIN_UART_LCR);
 	r0 = 0x0(Z);
 	w[p0] = r0.L;	/* To enable DLL writes */
 	ssync;

 	p0.h = hi(BFIN_UART_DLL);
 	p0.l = lo(BFIN_UART_DLL);
 	r0 = 0x0(Z);
 	w[p0] = r0.L;
 	ssync;

 	p0.h = hi(BFIN_UART_DLH);
 	p0.l = lo(BFIN_UART_DLH);
 	r0 = 0x00(Z);
 	w[p0] = r0.L;
 	ssync;

 	p0.h = hi(BFIN_UART_GCTL);
 	p0.l = lo(BFIN_UART_GCTL);
 	r0 = 0x0(Z);
 	w[p0] = r0.L;	/* To enable UART clock */
 	ssync;

 	/* Initialize stack pointer */
 	sp.l = lo(INITIAL_STACK);
 	sp.h = hi(INITIAL_STACK);
 	fp = sp;
 	usp = sp;

 #ifdef CONFIG_EARLY_PRINTK
 	SP += -12;
 	call _init_early_exception_vectors;
 	SP += 12;
 #endif

 	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
 	call _bf53x_relocate_l1_mem;
 #if CONFIG_BFIN_KERNEL_CLOCK
 	call _start_dma_code;
 #endif

 	/* Code for initializing Async memory banks */

 	p2.h = hi(EBIU_AMBCTL1);
 	p2.l = lo(EBIU_AMBCTL1);
 	r0.h = hi(AMBCTL1VAL);
 	r0.l = lo(AMBCTL1VAL);
 	[p2] = r0;
 	ssync;

 	p2.h = hi(EBIU_AMBCTL0);
 	p2.l = lo(EBIU_AMBCTL0);
 	r0.h = hi(AMBCTL0VAL);
 	r0.l = lo(AMBCTL0VAL);
 	[p2] = r0;
 	ssync;

 	p2.h = hi(EBIU_AMGCTL);
 	p2.l = lo(EBIU_AMGCTL);
 	r0 = AMGCTLVAL;
 	w[p2] = r0;
 	ssync;

 	/* This section keeps the processor in supervisor mode
 	 * during kernel boot.  Switches to user mode at end of boot.
 	 * See page 3-9 of Hardware Reference manual for documentation.
 	 */

 	/* EVT15 = _real_start */

 	p0.l = lo(EVT15);
 	p0.h = hi(EVT15);
 	p1.l = _real_start;
 	p1.h = _real_start;
 	[p0] = p1;
 	csync;

 	p0.l = lo(IMASK);
 	p0.h = hi(IMASK);
 	p1.l = IMASK_IVG15;
 	p1.h = 0x0;
 	[p0] = p1;
 	csync;

 	raise 15;
 	p0.l = .LWAIT_HERE;
 	p0.h = .LWAIT_HERE;
 	reti = p0;
 #if ANOMALY_05000281
 	nop; nop; nop;
 #endif
 	rti;

 .LWAIT_HERE:
 	jump .LWAIT_HERE;
 ENDPROC(__start)

 ENTRY(_real_start)
 	[ -- sp ] = reti;
 	p0.l = lo(WDOGA_CTL);
 	p0.h = hi(WDOGA_CTL);
 	r0 = 0xAD6(z);
 	w[p0] = r0;	/* watchdog off for now */
 	ssync;

 	/* Code update for BSS size == 0
 	 * Zero out the bss region.
 	 */

 	p1.l = ___bss_start;
 	p1.h = ___bss_start;
 	p2.l = ___bss_stop;
 	p2.h = ___bss_stop;
 	r0 = 0;
 	p2 -= p1;
 	lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
 .L_clear_bss:
 	B[p1++] = r0;

 	/* In case there is a NULL pointer reference
 	 * Zero out region before stext
 	 */

 	p1.l = 0x0;
 	p1.h = 0x0;
 	r0.l = __stext;
 	r0.h = __stext;
 	r0 = r0 >> 1;
 	p2 = r0;
 	r0 = 0;
 	lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
 .L_clear_zero:
 	W[p1++] = r0;

 	/* pass the uboot arguments to the global value command line */
 	R0 = R7;
 	call _cmdline_init;

 	p1.l = __rambase;
 	p1.h = __rambase;
 	r0.l = __sdata;
 	r0.h = __sdata;
 	[p1] = r0;

 	p1.l = __ramstart;
 	p1.h = __ramstart;
 	p3.l = ___bss_stop;
 	p3.h = ___bss_stop;

 	r1 = p3;
 	[p1] = r1;

 	/*
 	 * load the current thread pointer and stack
 	 */
 	r1.l = _init_thread_union;
 	r1.h = _init_thread_union;

 	r2.l = 0x2000;
 	r2.h = 0x0000;
 	r1 = r1 + r2;
 	sp = r1;
 	usp = sp;
 	fp = sp;
 	jump.l _start_kernel;
 ENDPROC(_real_start)

 __FINIT

 .section .l1.text
 #if CONFIG_BFIN_KERNEL_CLOCK
 ENTRY(_start_dma_code)
 	p0.h = hi(SICA_IWR0);
 	p0.l = lo(SICA_IWR0);
 	r0.l = 0x1;
 	[p0] = r0;
 	SSYNC;

 	/*
 	 *  Set PLL_CTL
 	 *   - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
 	 *   - [8]     = BYPASS    : BYPASS the PLL, run CLKIN into CCLK/SCLK
 	 *   - [7]     = output delay (add 200ps of delay to mem signals)
 	 *   - [6]     = input delay (add 200ps of input delay to mem signals)
 	 *   - [5]     = PDWN      : 1=All Clocks off
 	 *   - [3]     = STOPCK    : 1=Core Clock off
 	 *   - [1]     = PLL_OFF   : 1=Disable Power to PLL
 	 *   - [0]     = DF        : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
 	 *   all other bits set to zero
 	 */

 	p0.h = hi(PLL_LOCKCNT);
 	p0.l = lo(PLL_LOCKCNT);
 	r0 = 0x300(Z);
 	w[p0] = r0.l;
 	ssync;

 	P2.H = hi(EBIU_SDGCTL);
 	P2.L = lo(EBIU_SDGCTL);
 	R0 = [P2];
 	BITSET (R0, 24);
 	[P2] = R0;
 	SSYNC;

 	r0 = CONFIG_VCO_MULT & 63;       /* Load the VCO multiplier         */
 	r0 = r0 << 9;                    /* Shift it over,                  */
 	r1 = CLKIN_HALF;                 /* Do we need to divide CLKIN by 2?*/
 	r0 = r1 | r0;
 	r1 = PLL_BYPASS;                 /* Bypass the PLL?                 */
 	r1 = r1 << 8;                    /* Shift it over                   */
 	r0 = r1 | r0;                    /* add them all together           */

 	p0.h = hi(PLL_CTL);
 	p0.l = lo(PLL_CTL);              /* Load the address                */
 	cli r2;                          /* Disable interrupts              */
 	ssync;
 	w[p0] = r0.l;                    /* Set the value                   */
 	idle;                            /* Wait for the PLL to stablize    */
 	sti r2;                          /* Enable interrupts               */

 .Lcheck_again:
 	p0.h = hi(PLL_STAT);
 	p0.l = lo(PLL_STAT);
 	R0 = W[P0](Z);
 	CC = BITTST(R0,5);
 	if ! CC jump .Lcheck_again;

 	/* Configure SCLK & CCLK Dividers */
 	r0 = (CONFIG_CCLK_ACT_DIV | CONFIG_SCLK_DIV);
 	p0.h = hi(PLL_DIV);
 	p0.l = lo(PLL_DIV);
 	w[p0] = r0.l;
 	ssync;

 	p0.l = lo(EBIU_SDRRC);
 	p0.h = hi(EBIU_SDRRC);
 	r0 = mem_SDRRC;
 	w[p0] = r0.l;
 	ssync;

 	p0.l = LO(EBIU_SDBCTL);
 	p0.h = HI(EBIU_SDBCTL);     /* SDRAM Memory Bank Control Register */
 	r0 = mem_SDBCTL;
 	w[p0] = r0.l;
 	ssync;

 	P2.H = hi(EBIU_SDGCTL);
 	P2.L = lo(EBIU_SDGCTL);
 	R0 = [P2];
 	BITCLR (R0, 24);
 	p0.h = hi(EBIU_SDSTAT);
 	p0.l = lo(EBIU_SDSTAT);
 	r2.l = w[p0];
 	cc = bittst(r2,3);
 	if !cc jump .Lskip;
 	NOP;
 	BITSET (R0, 23);
 .Lskip:
 	[P2] = R0;
 	SSYNC;

 	R0.L = lo(mem_SDGCTL);
 	R0.H = hi(mem_SDGCTL);
 	R1 = [p2];
 	R1 = R1 | R0;
 	[P2] = R1;
 	SSYNC;

 	RTS;
 ENDPROC(_start_dma_code)
 #endif /* CONFIG_BFIN_KERNEL_CLOCK */

 .data

 /*
  * Set up the usable of RAM stuff. Size of RAM is determined then
  * an initial stack set up at the end.
  */

 .align 4
 __rambase:
 .long   0
 __ramstart:
 .long   0
 __ramend:
 .long   0
	/*
	* File: arch/blackfin/mach-bf561/head.S
	* Based on: arch/blackfin/mach-bf533/head.S
	* Author:
	*
	* Created:
	* Description: BF561 startup file
	*
	* Modified:
	* Copyright 2004-2006 Analog Devices Inc.
	*
	* Bugs: Enter bugs at http://blackfin.uclinux.org/
	*
	* 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, see the file COPYING, or write
	* to the Free Software Foundation, Inc.,
	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	*/

	#include <linux/linkage.h>
	#include <linux/init.h>
	#include <asm/blackfin.h>
	#include <asm/trace.h>

	#if CONFIG_BFIN_KERNEL_CLOCK
	#include <asm/mach-common/clocks.h>
	#include <asm/mach/mem_init.h>
	#endif

	.global __rambase
	.global __ramstart
	.global __ramend
	.extern ___bss_stop
	.extern ___bss_start
	.extern _bf53x_relocate_l1_mem

	#define INITIAL_STACK 0xFFB01000

	__INIT

	ENTRY(__start)
	/* R0: argument of command line string, passed from uboot, save it */
	R7 = R0;
	/* Enable Cycle Counter and Nesting Of Interrupts */
	#ifdef CONFIG_BFIN_SCRATCH_REG_CYCLES
	R0 = SYSCFG_SNEN;
	#else
	R0 = SYSCFG_SNEN \| SYSCFG_CCEN;
	#endif
	SYSCFG = R0;
	R0 = 0;

	/* Clear Out All the data and pointer Registers */
	R1 = R0;
	R2 = R0;
	R3 = R0;
	R4 = R0;
	R5 = R0;
	R6 = R0;

	P0 = R0;
	P1 = R0;
	P2 = R0;
	P3 = R0;
	P4 = R0;
	P5 = R0;

	LC0 = r0;
	LC1 = r0;
	L0 = r0;
	L1 = r0;
	L2 = r0;
	L3 = r0;

	/* Clear Out All the DAG Registers */
	B0 = r0;
	B1 = r0;
	B2 = r0;
	B3 = r0;

	I0 = r0;
	I1 = r0;
	I2 = r0;
	I3 = r0;

	M0 = r0;
	M1 = r0;
	M2 = r0;
	M3 = r0;

	trace_buffer_init(p0,r0);
	P0 = R1;
	R0 = R1;

	/* Turn off the icache */
	p0.l = LO(IMEM_CONTROL);
	p0.h = HI(IMEM_CONTROL);
	R1 = [p0];
	R0 = ~ENICPLB;
	R0 = R0 & R1;

	#if ANOMALY_05000125
	CLI R2;
	SSYNC;
	#endif
	[p0] = R0;
	SSYNC;
	#if ANOMALY_05000125
	STI R2;
	#endif

	/* Turn off the dcache */
	p0.l = LO(DMEM_CONTROL);
	p0.h = HI(DMEM_CONTROL);
	R1 = [p0];
	R0 = ~ENDCPLB;
	R0 = R0 & R1;

	/* Anomaly 05000125 */
	#if ANOMALY_05000125
	CLI R2;
	SSYNC;
	#endif
	[p0] = R0;
	SSYNC;
	#if ANOMALY_05000125
	STI R2;
	#endif

	/* Initialise UART - when booting from u-boot, the UART is not disabled
	* so if we dont initalize here, our serial console gets hosed */
	p0.h = hi(BFIN_UART_LCR);
	p0.l = lo(BFIN_UART_LCR);
	r0 = 0x0(Z);
	w[p0] = r0.L; /* To enable DLL writes */
	ssync;

	p0.h = hi(BFIN_UART_DLL);
	p0.l = lo(BFIN_UART_DLL);
	r0 = 0x0(Z);
	w[p0] = r0.L;
	ssync;

	p0.h = hi(BFIN_UART_DLH);
	p0.l = lo(BFIN_UART_DLH);
	r0 = 0x00(Z);
	w[p0] = r0.L;
	ssync;

	p0.h = hi(BFIN_UART_GCTL);
	p0.l = lo(BFIN_UART_GCTL);
	r0 = 0x0(Z);
	w[p0] = r0.L; /* To enable UART clock */
	ssync;

	/* Initialize stack pointer */
	sp.l = lo(INITIAL_STACK);
	sp.h = hi(INITIAL_STACK);
	fp = sp;
	usp = sp;

	#ifdef CONFIG_EARLY_PRINTK
	SP += -12;
	call _init_early_exception_vectors;
	SP += 12;
	#endif

	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */
	call _bf53x_relocate_l1_mem;
	#if CONFIG_BFIN_KERNEL_CLOCK
	call _start_dma_code;
	#endif

	/* Code for initializing Async memory banks */

	p2.h = hi(EBIU_AMBCTL1);
	p2.l = lo(EBIU_AMBCTL1);
	r0.h = hi(AMBCTL1VAL);
	r0.l = lo(AMBCTL1VAL);
	[p2] = r0;
	ssync;

	p2.h = hi(EBIU_AMBCTL0);
	p2.l = lo(EBIU_AMBCTL0);
	r0.h = hi(AMBCTL0VAL);
	r0.l = lo(AMBCTL0VAL);
	[p2] = r0;
	ssync;

	p2.h = hi(EBIU_AMGCTL);
	p2.l = lo(EBIU_AMGCTL);
	r0 = AMGCTLVAL;
	w[p2] = r0;
	ssync;

	/* This section keeps the processor in supervisor mode
	* during kernel boot. Switches to user mode at end of boot.
	* See page 3-9 of Hardware Reference manual for documentation.
	*/

	/* EVT15 = _real_start */

	p0.l = lo(EVT15);
	p0.h = hi(EVT15);
	p1.l = _real_start;
	p1.h = _real_start;
	[p0] = p1;
	csync;

	p0.l = lo(IMASK);
	p0.h = hi(IMASK);
	p1.l = IMASK_IVG15;
	p1.h = 0x0;
	[p0] = p1;
	csync;

	raise 15;
	p0.l = .LWAIT_HERE;
	p0.h = .LWAIT_HERE;
	reti = p0;
	#if ANOMALY_05000281
	nop; nop; nop;
	#endif
	rti;

	.LWAIT_HERE:
	jump .LWAIT_HERE;
	ENDPROC(__start)

	ENTRY(_real_start)
	[ -- sp ] = reti;
	p0.l = lo(WDOGA_CTL);
	p0.h = hi(WDOGA_CTL);
	r0 = 0xAD6(z);
	w[p0] = r0; /* watchdog off for now */
	ssync;

	/* Code update for BSS size == 0
	* Zero out the bss region.
	*/

	p1.l = ___bss_start;
	p1.h = ___bss_start;
	p2.l = ___bss_stop;
	p2.h = ___bss_stop;
	r0 = 0;
	p2 -= p1;
	lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
	.L_clear_bss:
	B[p1++] = r0;

	/* In case there is a NULL pointer reference
	* Zero out region before stext
	*/

	p1.l = 0x0;
	p1.h = 0x0;
	r0.l = __stext;
	r0.h = __stext;
	r0 = r0 >> 1;
	p2 = r0;
	r0 = 0;
	lsetup (.L_clear_zero, .L_clear_zero) lc0 = p2;
	.L_clear_zero:
	W[p1++] = r0;

	/* pass the uboot arguments to the global value command line */
	R0 = R7;
	call _cmdline_init;

	p1.l = __rambase;
	p1.h = __rambase;
	r0.l = __sdata;
	r0.h = __sdata;
	[p1] = r0;

	p1.l = __ramstart;
	p1.h = __ramstart;
	p3.l = ___bss_stop;
	p3.h = ___bss_stop;

	r1 = p3;
	[p1] = r1;

	/*
	* load the current thread pointer and stack
	*/
	r1.l = _init_thread_union;
	r1.h = _init_thread_union;

	r2.l = 0x2000;
	r2.h = 0x0000;
	r1 = r1 + r2;
	sp = r1;
	usp = sp;
	fp = sp;
	jump.l _start_kernel;
	ENDPROC(_real_start)

	__FINIT

	.section .l1.text
	#if CONFIG_BFIN_KERNEL_CLOCK
	ENTRY(_start_dma_code)
	p0.h = hi(SICA_IWR0);
	p0.l = lo(SICA_IWR0);
	r0.l = 0x1;
	[p0] = r0;
	SSYNC;

	/*
	* Set PLL_CTL
	* - [14:09] = MSEL[5:0] : CLKIN / VCO multiplication factors
	* - [8] = BYPASS : BYPASS the PLL, run CLKIN into CCLK/SCLK
	* - [7] = output delay (add 200ps of delay to mem signals)
	* - [6] = input delay (add 200ps of input delay to mem signals)
	* - [5] = PDWN : 1=All Clocks off
	* - [3] = STOPCK : 1=Core Clock off
	* - [1] = PLL_OFF : 1=Disable Power to PLL
	* - [0] = DF : 1=Pass CLKIN/2 to PLL / 0=Pass CLKIN to PLL
	* all other bits set to zero
	*/

	p0.h = hi(PLL_LOCKCNT);
	p0.l = lo(PLL_LOCKCNT);
	r0 = 0x300(Z);
	w[p0] = r0.l;
	ssync;

	P2.H = hi(EBIU_SDGCTL);
	P2.L = lo(EBIU_SDGCTL);
	R0 = [P2];
	BITSET (R0, 24);
	[P2] = R0;
	SSYNC;

	r0 = CONFIG_VCO_MULT & 63; /* Load the VCO multiplier */
	r0 = r0 << 9; /* Shift it over, */
	r1 = CLKIN_HALF; /* Do we need to divide CLKIN by 2?*/
	r0 = r1 \| r0;
	r1 = PLL_BYPASS; /* Bypass the PLL? */
	r1 = r1 << 8; /* Shift it over */
	r0 = r1 \| r0; /* add them all together */

	p0.h = hi(PLL_CTL);
	p0.l = lo(PLL_CTL); /* Load the address */
	cli r2; /* Disable interrupts */
	ssync;
	w[p0] = r0.l; /* Set the value */
	idle; /* Wait for the PLL to stablize */
	sti r2; /* Enable interrupts */

	.Lcheck_again:
	p0.h = hi(PLL_STAT);
	p0.l = lo(PLL_STAT);
	R0 = W[P0](Z);
	CC = BITTST(R0,5);
	if ! CC jump .Lcheck_again;

	/* Configure SCLK & CCLK Dividers */
	r0 = (CONFIG_CCLK_ACT_DIV \| CONFIG_SCLK_DIV);
	p0.h = hi(PLL_DIV);
	p0.l = lo(PLL_DIV);
	w[p0] = r0.l;
	ssync;

	p0.l = lo(EBIU_SDRRC);
	p0.h = hi(EBIU_SDRRC);
	r0 = mem_SDRRC;
	w[p0] = r0.l;
	ssync;

	p0.l = LO(EBIU_SDBCTL);
	p0.h = HI(EBIU_SDBCTL); /* SDRAM Memory Bank Control Register */
	r0 = mem_SDBCTL;
	w[p0] = r0.l;
	ssync;

	P2.H = hi(EBIU_SDGCTL);
	P2.L = lo(EBIU_SDGCTL);
	R0 = [P2];
	BITCLR (R0, 24);
	p0.h = hi(EBIU_SDSTAT);
	p0.l = lo(EBIU_SDSTAT);
	r2.l = w[p0];
	cc = bittst(r2,3);
	if !cc jump .Lskip;
	NOP;
	BITSET (R0, 23);
	.Lskip:
	[P2] = R0;
	SSYNC;

	R0.L = lo(mem_SDGCTL);
	R0.H = hi(mem_SDGCTL);
	R1 = [p2];
	R1 = R1 \| R0;
	[P2] = R1;
	SSYNC;

	RTS;
	ENDPROC(_start_dma_code)
	#endif /* CONFIG_BFIN_KERNEL_CLOCK */

	.data

	/*
	* Set up the usable of RAM stuff. Size of RAM is determined then
	* an initial stack set up at the end.
	*/

	.align 4
	__rambase:
	.long 0
	__ramstart:
	.long 0
	__ramend:
	.long 0