Dear All:

I found following codes in start.S of mpc824x, and its goal is to turn off data and instruction address translation. But I doubt its function, can anyone help me to clarify.

Source code my attitude

mfmsr r3 /* assume the content of r3 was 0x0030 */ addis r4, 0, 0xffff /* r4 now is 0xffff, r4 <- 0xffff */ ori r4, r4, 0xffcf /* r4 now still is 0xffff, r4 <- 0xffff | 0xffcf */ and r3, r3, r4 /* r3 now still is 0x0030, r3 <- 0x0030 | 0xffff */ mtmsr r3

Besr regards,

Ban

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