emulate.s

CIRRUS 公司EP93XX系列CPU的WINCE下的BSP

;****************************************************************************l
;
; Copyright (c) 1998-2001 Cirrus Logic, Inc.
;
; Cirrus Logic Confidential
;*****************************************************************************

;*****************************************************************************
; Read-only code area.
;
;*****************************************************************************
    AREA    |asmcode|, CODE, READONLY 

    IMPORT  ||Image$$ZI$$Limit||
    IMPORT  SdramCfg 
    IMPORT  CopyNGo      

    EXPORT VectorStub
	EXPORT BaseAddress
; 
; Vector Jump Table
;
VectorStub
BaseAddress
    DCB             "CRUS"
    ENTRY
    nop

    ;
    ; Use the Default clock configuration.
    ;
    ldr     r0, =0x0
    ldr     r1, =0x80930020
    str     r0, [r1]

    ;
    ; Turn on Icache.
    ;
    ldr     r0, =0x1078
    mcr     p15, 0, r0, c1, c0, 0

    ;
    ; Remove that agravating compiler warning my moving pc into r0.
    ;
    mov     r0, pc
    cmp     r0, #0x60000000
    bls     ExecuteFromRam

    ;
    ; Configure SDRAM
    ;
    bl      SdramCfg

ExecuteFromRam
    ldr     r13, =0x10000
    ldr     r0, =ImageData
    bl      CopyNGo

    cmp     r0, #0
    movne   pc, r0
    b       .

    LTORG 

    ALIGN   4
ImageData
    DCB     0xaa
    INCBIN  nk.bin

    END