I have no serial ports?

["jdls" <jdls@apu.edu>]

hello,

I am having some problems with my serial ports...

>From ls -l /dev/ttyS* shows..
crw-rw----    1 root     dialout    4,  64 Jul  5 23:14 /dev/ttyS0
crw-rw----    1 root     dialout    4,  65 Jul  5 23:14 /dev/ttyS1
crw-rw----    1 root     dialout    4,  66 Jul  5 23:14 /dev/ttyS2
crw-rw----    1 root     dialout    4,  67 Jul  5 23:14 /dev/ttyS3

but setserial -agv /dev/ttyS* shows...

/dev/tty0: No such device
/dev/tty1: No such device
/dev/tty2: No such device
/dev/tty3: No such device

Also, during boot-up I get:

modprobe: can't locate module char-major-4...

Question: why doesn't my serial ports get recognized? I tried upgrading to
a newer setserial then setting it via

#setserial /dev/ttyS0 or setserial /dev/ttyS1, etc... but I still get no
such device
perhaps I am passing setserial command with wrong parameters/arguments?
if so, how should I use setserial to fix this problem or should I use a
different approach?

Hoping for some advice

Thank you.