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On an embedded Linux platform, I have a network adapter attached to an SDIO interface. There is no Card Detect signal on this particular bus. If for instance, I turn the network adapter power on or off, is there any way I can force a re-scan of the SDIO bus from user space?

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Looks like there was a patch submitted to the linux-mmc mailing list to add this feature, however looking at the current source, it doesn't appear to have been added.

So unfortunately I guess this makes the answer: you can't.

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