NexusHD2 Android Forum

Hey Gyus,

Did anyone succeed to enable fstrim support on NexusHD2 ? i've tried on last tytung's KitKat but with no luck.

tried this:
http://android.stackexchange.com/questi ... from-shell

it gives me message "fstrim: FSTRIM: Not a typewriter"

i've read that its kernel related, but it should work becouse kernel in kitkat is "Linux localhost 2.6.32_tytung_jellybean_r2 #302 PREEMPT Sat Mar 16 15:38:22 CST 2013 armv7l GNU/Linux" and as i read here:
nexushd2-jellybean-cm10-2-t78-140.html#p1774
it should work from 2.6.32

tytung, can you do sth with that?

i think it will increase speed of our hd2's becouse it write is faster when using trim.

i've done fstrim with success but only on my ext4 partition, by putting in to my linux machine, mounting and trimming in there, but it's not solution imho.

I think fstrim can't works on all kind of file system, I should check. So maybe on NAND where we use yaffs2 is not possible

i dont think so. i have sd-ext which is ext4 and i cant use fstrim on it from phone, but i can do that plugging my card into linux machine.

activ wrote:Hey Gyus,

Did anyone succeed to enable fstrim support on NexusHD2 ? i've tried on last tytung's KitKat but with no luck.

tried this:
http://android.stackexchange.com/questi ... from-shell

it gives me message "fstrim: FSTRIM: Not a typewriter"

i've read that its kernel related, but it should work becouse kernel in kitkat is "Linux localhost 2.6.32_tytung_jellybean_r2 #302 PREEMPT Sat Mar 16 15:38:22 CST 2013 armv7l GNU/Linux" and as i read here:
nexushd2-jellybean-cm10-2-t78-140.html#p1774
it should work from 2.6.32

tytung, can you do sth with that?

i think it will increase speed of our hd2's becouse it write is faster when using trim.

i've done fstrim with success but only on my ext4 partition, by putting in to my linux machine, mounting and trimming in there, but it's not solution imho.

I'm busy.
My kernel is open source. Please add any features yourself. Thanks.

okey. this is what i found:

trim support starts from 2.6.37 kernel.
last 3 functions in this file do the job:
https://github.com/torvalds/linux/blob/ ... /mballoc.c

i've tried to backport them - but with no luck. too many connections and changes between code.

yaffs2 do not supports trim - only ext4.
ext4 (so data on ext and nativesd) users will experience huge speed improvemend using trim.