How to enable trim (discard) with ssd harddisk in linux

[gulfstream <gulfstream.wang@gmail.com>]

Hello,

My kernel is 2.6.32, which was customized and complied myself. I want to enable trim with ssd harddisk in my debian. Besides set "discard" in fstab file, which option should be set in kernel config file?


Thank you!

gulfstream