<u-boot>/cpu/mpc8xx/start.S
.... .... .globl relocate_code relocate_code: mr r1, r3 /* Set new stack pointer */ mr r9, r4 /* Save copy of Global Data pointer */ mr r10, r5 /* Save copy of Destination Address */ .... cmplw cr1,r3,r4 addi r0,r5,3 srwi. r0,r0,2 beq cr1,4f /* In place copy is not necessary */ beq 7f /* Protect against 0 count */ mtctr r0 bge cr1,2f ^^^^^^^^^^ why we need to differeciate the two situation, addr>CFG_MONITOR_BASE and addr<=CFG_MONITOR_BASE
la r8,-4(r4) la r7,-4(r3) 1: lwzu r0,4(r8) stwu r0,4(r7) bdnz 1b b 4f
2: slwi r0,r0,2 <<----------------- i think above code will be enough for the two add r8,r4,r0 situation add r7,r3,r0 3: lwzu r0,-4(r8) stwu r0,-4(r7) bdnz 3b .... ....
thnx best regards