[U-Boot] A question about "Initialize GOT pointer"

hi,all: here is a question, who can tell me? thanks.   in uboot file : cpu/mips/start.S   /* Initialize GOT pointer. */         bal     1f         nop         .word   _GLOBAL_OFFSET_TABLE_         1:         move    gp, ra         lw      t1, 0(ra)         move    gp, t1   I do't know why code "move    gp, ra"  needed?  what happened if we remove these code?

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