[root@fette]~ #cryptsetup -y --cipher aes-cbc-essiv:sha256 --key-size 128 luksFormat /dev/loop1           [/dev/pts/4 # 516 - 0 - 237 # 0 day 21:08:22 # 0.04 - 0.29 - 0.18]

WARNING!
========
This will overwrite data on /dev/loop1 irrevocably.

Are you sure? (Type uppercase yes): YES
Enter LUKS passphrase:
Verify passphrase:
Failed to setup dm-crypt key mapping.
Check kernel for support for the aes-cbc-essiv:sha256 cipher spec and verify that /dev/loop1 contains at least 133 sectors.
Failed to write to key storage.
Command failed.
[root@fette]~ #lsmod |grep aes                                                                            [/dev/pts/4 # 517 - 0 - 251 # 0 day 21:09:14 # 0.10 - 0.26 - 0.17]
geode_aes               7176  0
aes_i586               33536  2
blkcipher               8324  2 geode_aes,cbc
[root@fette]~ #rmmod geode_aes                                                                              [/dev/pts/4 # 518 - 0 - 0 # 0 day 21:09:48 # 0.05 - 0.23 - 0.16]
[root@fette]~ #cryptsetup -y --cipher aes-cbc-essiv:sha256 --key-size 128 luksFormat /dev/loop1             [/dev/pts/4 # 519 - 0 - 0 # 0 day 21:10:02 # 0.04 - 0.22 - 0.16]

WARNING!
========
This will overwrite data on /dev/loop1 irrevocably.

Are you sure? (Type uppercase yes): YES
Enter LUKS passphrase:
Verify passphrase:
Command successful.
[root@fette]~ #lsmod |grep aes                                                                              [/dev/pts/4 # 520 - 0 - 0 # 0 day 21:10:12 # 0.11 - 0.23 - 0.16]
aes_i586               33536  2
[root@fette]~ #