nand_s.s

Embest IDE下s3c2440的测试工程

#
# Copyright (c) Microsoft Corporation.  All rights reserved.
#
#
# Use of this source code is subject to the terms of the Microsoft end-user
# license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.
# If you did not accept the terms of the EULA, you are not authorized to use
# this source code. For a copy of the EULA, please see the LICENSE.RTF on your
# install media.
#
#*************************************************************
# NAME : NAND FLASH Subroutine for a410 bootstrap
# DATE : 18.FEB.2002
# DESC :
#  02.18.2002:purnnamu: modified for A410
#  04.24.2002:purnnamu: optimized for NAND flash bootstrap 
#*************************************************************

.equ	A410_BASE_ADDR	,	0x2000000
.equ	PHY_RAM_START   , 0x30000000
.equ	VIR_RAM_START   , 0x8c000000

	.MACRO 	LDR4STR1 src,tmp1,tmp2	
	ldrb	\tmp1,[\src]
	ldrb	\tmp2,[\src]
	orr	\tmp1,\tmp1,\tmp2,LSL #8
	ldrb	\tmp2,[\src]
	orr	\tmp1,\tmp1,\tmp2,LSL #16
	ldrb	\tmp2,[\src]
	orr	\tmp1,\tmp1,\tmp2,LSL #24
	.ENDM

.text
	
	.global	__RdPage2048
__RdPage2048:
#input:a1(r0)=pPage
	stmfd	sp!,{r1-r11}

	ldr	r1,=0x4e000010  @NFDATA
	mov	r2,#0x800
B2:	
	LDR4STR1 r1,r4,r3
	LDR4STR1 r1,r5,r3
	LDR4STR1 r1,r6,r3
	LDR4STR1 r1,r7,r3
	LDR4STR1 r1,r8,r3
	LDR4STR1 r1,r9,r3
	LDR4STR1 r1,r10,r3
	LDR4STR1 r1,r11,r3
	stmia	r0!,{r4-r11}
	subs	r2,r2,#32
	bne	B2

	ldmfd	sp!,{r1-r11}
	mov	pc,lr

.global Launch
Launch:

    ldr r2, = PhysicalStart

    mov     r1, #0x0070             @ Disable MMU
    mcr     p15, 0, r1, c1, c0, 0
    nop
    mov     pc, r2                  @ Jump to PStart
    nop

PhysicalStart:
    mov     r2, #0
    mcr     p15, 0, r2, c8, c7, 0   @ Flush the TLB
    mov     pc, r0          @ Jump to program we are launching.