Hi Ulf, > Have the mmc host driver setup MMC_CAP_ERASE? That is needed, > otherwise the block queue wont be supporting DISCARD operations. Thanks a lot for your reply. Indeed it seems MMC_CAP_ERASE is not supported by the raspberry pi driver. Just to be curious: Is the erease command also supported on SD cards or only on eMMC? Thanks, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html