powerpc/mpc8548: Add workaround for erratum NMG_eTSEC129
Erratum NMG_eTSEC129 (eTSEC86 in MPC8548 document) applies to some early verion silicons. This workaround detects if the eTSEC Rx logic is properly initialized, and reinitialize the eTSEC Rx logic. Signed-off-by: NGong Chen <g.chen@freescale.com> Signed-off-by: NZhao Chenhui <chenhui.zhao@freescale.com> Signed-off-by: NKumar Gala <galak@kernel.crashing.org>
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