[U-Boot-Users] MPC824x turn off address translation code?

[Jian-Bang Lai]

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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