USB mmcblk support (realtek or others)

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Can a USB card-reader ever appear as /dev/mmcblk0 and support the MMC ioctl commands?



I see there are some kernel driver modules such as:



rtsx_usb_sdmmc.ko (rtsx-usb-sdmmc)
rtsx_usb.ko (rtsx-usb)


Can these make a realtek card reader, attached to the USB bus appear as a real MMC device? I notice that all the USB card readers I have access to appear as /dev/sdX. which appear to be an emulated SCSI device. These emulated SCSI devices do not support all the MMC operations (ioctl).



Are there certain USB-attached card-readers (chips) that appear as a /dev/mmcblkX instead of /dev/sdX?



This would allow the card to support blkdiscard, trim or fstrim.






usb sd-card mmc







share|improve this question


























    0














    Can a USB card-reader ever appear as /dev/mmcblk0 and support the MMC ioctl commands?



    I see there are some kernel driver modules such as:



    rtsx_usb_sdmmc.ko (rtsx-usb-sdmmc)
    rtsx_usb.ko (rtsx-usb)


    Can these make a realtek card reader, attached to the USB bus appear as a real MMC device? I notice that all the USB card readers I have access to appear as /dev/sdX. which appear to be an emulated SCSI device. These emulated SCSI devices do not support all the MMC operations (ioctl).



    Are there certain USB-attached card-readers (chips) that appear as a /dev/mmcblkX instead of /dev/sdX?



    This would allow the card to support blkdiscard, trim or fstrim.






    usb sd-card mmc







    share|improve this question
























      0












      0








      0







      Can a USB card-reader ever appear as /dev/mmcblk0 and support the MMC ioctl commands?



      I see there are some kernel driver modules such as:



      rtsx_usb_sdmmc.ko (rtsx-usb-sdmmc)
      rtsx_usb.ko (rtsx-usb)


      Can these make a realtek card reader, attached to the USB bus appear as a real MMC device? I notice that all the USB card readers I have access to appear as /dev/sdX. which appear to be an emulated SCSI device. These emulated SCSI devices do not support all the MMC operations (ioctl).



      Are there certain USB-attached card-readers (chips) that appear as a /dev/mmcblkX instead of /dev/sdX?



      This would allow the card to support blkdiscard, trim or fstrim.






      usb sd-card mmc







      share|improve this question













      Can a USB card-reader ever appear as /dev/mmcblk0 and support the MMC ioctl commands?



      I see there are some kernel driver modules such as:



      rtsx_usb_sdmmc.ko (rtsx-usb-sdmmc)
      rtsx_usb.ko (rtsx-usb)


      Can these make a realtek card reader, attached to the USB bus appear as a real MMC device? I notice that all the USB card readers I have access to appear as /dev/sdX. which appear to be an emulated SCSI device. These emulated SCSI devices do not support all the MMC operations (ioctl).



      Are there certain USB-attached card-readers (chips) that appear as a /dev/mmcblkX instead of /dev/sdX?



      This would allow the card to support blkdiscard, trim or fstrim.






      usb sd-card mmc




      usb sd-card mmc






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Dec 15 at 20:33









      Gregor

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