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Add a card_busy host operation that reports whether the card holds its data line low. SDHCI reads the DAT0 level from the present state register. wait_ready checks it before each CMD13, so the card is asked for its status only once it has finished programming or erasing.
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Adds an SPI host and SPI mode for SD memory cards, following Figure 7-2 of the SD specification, plus a card_busy host operation that wait_ready checks before each CMD13.