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As per the SD physical layer specification version 7.10, erase command (CMD38) and stop transmission command (CMD12) will generate R1b response. R1b = R1 + busy signal A non-zero value after the R1 response indicates card is ready for next command. Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com> Reviewed-by: Bin Meng <bin.meng@windriver.com> Tested-by: Bin Meng <bin.meng@windriver.com>