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arm9 操作 flash 问题

sunmoon98
菜鸟
2007-03-07 18:47:24     打赏

在uboot1.1中, at91rm9200 操作flash 的 flash.c :
#define MEM_FLASH_ADDR1 (*(volatile u16 *)(CFG_FLASH_BASE + (0x00005555<<1)))
#define MEM_FLASH_ADDR2 (*(volatile u16 *)(CFG_FLASH_BASE + (0x00002AAA<<1)))

#define IDENT_FLASH_ADDR1 (*(volatile u16 *)(CFG_FLASH_BASE + (0x0000555<<1)))
#define IDENT_FLASH_ADDR2 (*(volatile u16 *)(CFG_FLASH_BASE + (0x0000AAA<<1)))

IDENT_FLASH_ADDR 检查 flash ID ,MEM_FLASH_ADDR erase/write flash.
am29lv160db 的 datasheet 上的命令: 0x 555 /0x2aa

我是问题:

1) 什么时候addr 要<<1,为什么在一些烧写的例子是不用的?
(2) 什么时候 要用MEM_FLASH_ADDR 为什么它与datasheet 上的不一样?

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关键词： 操作     flash     问题     FLASH    

ryansheng
菜鸟
2007-03-07 23:24:00     打赏
2楼

这与flash芯片与ARM总线的接法有关，不能死看datasheet。


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sunmoon98
菜鸟
2007-03-08 16:41:00     打赏
3楼

能说一下清楚吧

对于 <<1,我还能理解一下,可能flash 是16bits的原因,但我用JTAG erase/write flash 时,是不用<<1,但这样也能正常操作的.

所以不懂的地方在这里.


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honenn
菜鸟
2007-03-11 06:47:00     打赏
4楼

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