External Bus Interface

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yoyowodeai| 中级工程师

楼主 | 2010-8-9 22:42 | 只看该作者回帖奖励

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interface, external, dc, CD, sd

我在init.S 中增加 EXT0CON EXT1CON EXT2CON 如下

; Load in the target values into the control registers
   ADRL r0, remap_SystemInitData
   ;LDR r0, =remap_SystemInitData
   LDMIA r0, {r1-r9}
   LDR r0, =EBI_Ctrl

; Now run critical jump code
   STMIA r0, {r1-r9}
   MOV pc, lr
remap_EndSysMapJump

remap_SystemInitData
   ; Default sdram configuration
DCD 0x000530C1                   ; EBICON : not need to change.
DCD 0x40050084                   ; 8M
;DCD 0x000090CC             ; SDCONF0(SDRAM) -  2M (1Mx16):0x00009041
                                 ;             -  8M (2Mx32):0x000090E3
                                 ;                16M (4Mx32):0x000090E4
                                 ;             - 16M (8x16M):0x000090CC
                                 ;             - 32M (32Mx8):0x000090B5
                                 ;             - 64M (16Mx16x2):0x000090EE
;DCD 0x020090CC             ; SDCONF1 - The same as SDCONF0 with proper base address
DCD 0x000090CD                ; 32M
DCD 0x020090CD                ; 32M
DCD 0x0000015B                   ; SDTIME0 - not need to change
DCD 0x0000015B                   ; SDTIME1 - not need to change
DCD 0x60004491                   ; address 0x30000000
DCD 0x80004491                   ; address 0x40000000
DCD 0xA0004491                   ; address 0x50000000
DCB "@SYSTEM_INIT_CFG"          ; A key word for future useage
ALIGN

重新編譯之後燒到板子上
但是我dump
0xB000_1018 (EXT0CON)
0xB000_101C (EXT1CON)
0xB000_1020 (EXT2CON)
卻都還是0X0
請問是哪裡還需要修改呢?

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