Hi, After searching a lot for my emmc/trim issue, I ran into this great mailing list, which is exactly what I am looking for. In my system, when I test the trim feature, I always got the following: $fstrim /mnt/mymmc/ fstrim: /mnt/mymmc/: FITRIM ioctl failed: Operation not supported $cat /sys/class/block/mmcblk0/queue/discard_max_bytes 0 the mmc_calc_max_discard() prints out: mmc0: calculated max. discard sectors 0 for timeout 402 ms. My system information: 1.P5040,eSDHC controller, 2.a Micron eMMC chip , EXT_CSD_TRIM_MULT is 15, 3. SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK, host->max_clk is 333333332MHz the following thread (https://www.mail-archive.com/linux-mmc%40vger.kernel.org/msg26133.html) has a very similar issue, but I don't know how and where I can get a patch. Thanks in advance, Jerry -- 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
