linux2.6下的 ioremap 问题：
实验平台：linux2.6.9
交叉编译器：arm-linux-gcc-3.4.6-glibc-2.3.6
试验程序：
ADDR_SJA1000_ADDR = ioremap(0x04000000,0xff);
ADDR_SJA1000_DATA = ADDR_SJA1000_ADDR + (0x1<<2);
printk("ADDR_SJA1000_ADDR = %x\n",ADDR_SJA1000_ADDR);
printk("ADDR_SJA1000_DATA = %x\n",ADDR_SJA1000_DATA);
打印结果：
ADDR_SJA1000_ADDR = c4874000
DDR_SJA1000_DATA = c4874010
难道DDR_SJA1000_DATA 的值 不应该是c4874004 吗
在linux2.4.14 下打印DDR_SJA1000_DATA = c4874004
我又在2.6下试了一下发现：
ADDR_SJA1000_DATA = ADDR_SJA1000_ADDR + ？ ---- DDR_SJA1000_DATA =？
(0x1<<2)-----c4874010
(0x1<<1)-----c4874008
(0x1<<0)-----c4874004
而在2.4下 相关数据为
(0x1<<2)-----c4874004
(0x1<<1)-----c4874002
(0x1<<0)-----c4874001
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