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Date: Sun, 16 Oct 2016 12:08:26 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: George Mitchell <george+freebsd@m5p.com>
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 FreeBSD Stable Mailing List <freebsd-stable@freebsd.org>
Subject: Re: Clandestine USB SD card slot
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On Sun, 16 Oct 2016, George Mitchell wrote:

>> So not only is it (apparently) recognized, but the sdhci_pci driver
>> attached to it!  But inserting or removing a card shows no activity.
>> What's my next step?                                      -- George

Is a device created for the empty reader?  It's worth trying to force a 
retaste of that device with 'true > /dev/daX' after the card is 
inserted.