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According to eMMC spec, OCR.PowerUp bit is also busy bit. If the busy bit is '0', CMD1 should be sent and OCR should be fetched again. And add a timeout counter on the repeated steps. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org> Tested-by: Ryan Harkin <ryan.harkin@linaro.org> Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>