i have the same exact cifs.ko as you specify in your post. i had a small script put together. it ran something like this.

/sbin/insmod /media/mmc2/cifs.ko
/bin/mount -t cifs //server/share /mount/point -o user=me,password=secret
/bin/mount -t cifs //server/share1 /mount/point1 -o domain=domain,user=me,password=secret

i took the domain out of the first line to see if that was buggering things up, as i really dont have a "domain", although the samba server has a name there. i actually did have the domain= parameter match what the samba server is set to.

this file was owned by root chmod'd 700 and put on the mmc2 (internal) card. of course names were changed to protect the innocent, but it worked once and never again.

now, i see that you have some of the parameters in a different order than i do. is that really an issue?