CF serial cards

Does anyone have any experience using CF serial cards?  I'm trying to get a
SeaLevel CF RS232 card to run in my system.  In /var/log/messages, near the
end, I get:

Jan  1 00:00:18 AT91RM9200DK local7.notice pcmcia: cardmgr[63]: cannot
access /l
ib/modules/2.4.27-vrs1: No such file or directory
Jan  1 00:00:18 AT91RM9200DK daemon.notice cardmgr[63]: cannot access
/lib/modul
es/2.4.27-vrs1: No such file or directory
Jan  1 00:00:18 AT91RM9200DK daemon.info cardmgr[63]: watching 1 socket
Jan  1 00:00:18 AT91RM9200DK local7.notice pcmcia: cardmgr[63]: watching 1
socke
t
Jan  1 00:00:18 AT91RM9200DK local7.notice rc: Starting pcmcia succeeded
Jan  1 00:00:19 AT91RM9200DK daemon.info cardmgr[64]: socket 0: Serial or
Modem
Jan  1 00:00:19 AT91RM9200DK kern.info ttyS00 at port 0xc28223f8 (irq = 3)
is a
16550A

Jan  1 00:00:19 AT91RM9200DK daemon.info cardmgr[64]: executing: './serial
start
 ttyS0 2>&1'
Jan  1 00:00:19 AT91RM9200DK daemon.info cardmgr[64]: + sh: ./serial: No
such fi
le or directory
Jan  1 00:00:19 AT91RM9200DK daemon.notice cardmgr[64]: start cmd exited
with st
atus 126
Jan  1 00:02:08 AT91RM9200DK kern.info eth0: Link now 100-FullDuplex

Will the errors above keep me from being able to open the port using:
  open("/dev/tts/0", ....)
When I do this, it opens ttyS0 and writes to it.  Shouldn't the SeaLevel
card get registered as ttyS2?