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How uboot perform read/write on processor registers

Hi,

1. My doubt is, how u-boot maps processor registers to memory for read and write?

2. Correct me if i am wrong, In kernel all registers are memory mapped into virtual address space(0x0-0xffffffff) by the MMU.

I googled but I didn't find proper answer, If anyone knows good link/tutorial please share with me.

regards,

Prav