今天在UBOOT代码前面加了个点灯程序
但是却点不起来,很诧异.
后来发现原来要在这部分代码之后才能点灯
ldr r0, =CONFIG_PERIPORT_BASE
orr r0, r0, #CONFIG_PERIPORT_SIZE
mcr p15,0,r0,c15,c2,4
在网上查了查,就是下面这个博客
http://blog.csdn.net/androidfan/article/details/5827237
原来arm11 memory和Peripheral接口分开了你需要上面这段代码告诉它 Peripheral的分布
否则它就会把他当作memory来操作
CRn Op1 CRm Op2
c15 0 c2 0Data Memory Remap R/W 0x01C97CC8 page 3-162
1 Instruction Memory Remap R/W 0x01C97CC8 page 3-162
2 DMA Memory Remap R/W 0x01C97CC8 page 3-162
4 Peripheral Port Memory Remap R/W 0x00000000 page 3-162
这段内容都在 上面那个博客里
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