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H A Dstart.Se80311a5f09967b2c33a772c26983abfbc821140 Tue Jan 17 07:33:47 UTC 2017 mario.six@gdsys.cc <mario.six@gdsys.cc> powerpc: mpc83xx: Minimize r1 modification

The r1 register is modified several times during the cache-ram setup of
the MPC83xx SoCs.

Since this SP modification confuses debuggers, we use a general purpose
register to compute the new stack pointer value, and only set the SP
once after all computations are done.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
Reviewed-by: York Sun <york.sun@nxp.com>