一段 memory check 代码,看看如何实现check memory

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williamt|

楼主 | 2007-3-3 10:53 | 只看该作者回帖奖励

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代码, ck, memory, ST, sd

    ; The default SDRAM type is 4M x 32 bits, it needs to be checked.
     LDR        r0, =0x0
     STR        r0, [r0]
     LDR        r1, =0x00800000
     LDR        r2, =0x12345678
     STR        r2, [r1]
     LDR        r3, [r0]
     CMP        r2, r3
     LDREQ    r0, =0xFFF01008
     LDREQ    r1, =0x000090E3
    STREQ    r1, [r0], #4
    LDREQ    r1, =0x010090E3
    STREQ    r1, [r0]

     ; check memory type (only check if 1Mx16x2 SDRAM type)
    LDR        r0,=0x0
    STR        r0,[r0]
    LDR        r0,=0x800
    LDR        r1,=0x12345678
    STR        r1,[r0]
    LDR        r0,=0x0
    LDR        r2,[r0]
    CMP        r1,r2
    LDREQ    r0,=0xFFF01008 ;sdconf0
    LDREQ    r1,=0x00009062
    STREQ    r1, [r0], #4
    LDREQ    r1,=0x00809062
    STREQ    r1, [r0]

    ; check bank 1 (check if the SDRAM existed in bank 1)
    LDR        r0, =0xFFF0100C
    LDR        r1, [r0]
    LDR        r2, =0xFFF80000
    AND        r2, r2, r1
    MOV        r2, r2, lsr #1
    MOV        r0, #0
    STR        r0, [r2]
    LDR        r0, [r2]
    LDR        r0, =0xAABBCCDD
    STR        r0, [r2]
    LDR        r1, [r2, #0xc]
    LDR        r1, [r2]
    CMP        r0, r1
    LDRNE    r0, =0xFFF0100C
    MOVNE    r1, #0
    STRNE    r1, [r0]

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