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大家好,问大家个问题。我先使用的是TQ210,目前在看UBOOT。有个疑问:
/* when we already run in ram, we don't need to relocate U-Boot.
* and actually, memory controller must be configured before U-Boot
* is running in ram.
*///用来区分是否已经运行在RAM中
ldr r0, =0xff000fff
bic r1, pc, r0 /* r0 <- current base addr of code */
ldr r2, _TEXT_BASE /* r1 <- original base addr in ram *///0xC3E00000
bic r2, r2, r0 /* r0 <- current base addr of code */
cmp r1, r2 /* compare r0, r1 */
beq after_copy /* r0 == r1 then skip flash copy *///code is copyed
但是这个TEXT_BASE设置成0xC3E00000,而拷贝到ram中的地址是0x23E00000,那这个r2不就变成0x00e00000,而r1就是0x00e00000,这样两个数值不管有没有拷贝过代码,地址不都是一样的吗?还是我看错了?
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