On 10 January 2014 21:18, Clemens Eisserer <linuxhippy@xxxxxxxxx> wrote: > Hi, > > I've read several reports of raspberry pi users which were able to > perform batch discards on their SD cards by invoking the "fstrim" > command, which in turn should be translated to an ERASE command > (cmd23). I found out some patches where commited to linux-mmc which > implement this functionality arround linux-2.6.36. > > However, all I get on my raspberry (as well as on my laptop) when > running fstrim is: >> root@raspberrypi:~# fstrim -v p2/ >> fstrim: mountp2/: FITRIM ioctl failed: Operation not supported > > Has this functionality been disabled intentionally, or is it likely an > issue with the SD card or the driver? > In case this is hw specific, how can I find out the cause it is disabled? Have the mmc host driver setup MMC_CAP_ERASE? That is needed, otherwise the block queue wont be supporting DISCARD operations. Kind regards Ulf Hansson > > Thank you in advance, 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 -- 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
