serial port access problem ...

hi . i'm working on embedded board EM2440 (embedsky) i'm trying to connect rfid and finger print devices to this board via serial port but the problem is about serial port : i can't use serial ports such as /dev/ttyS{0,1,2} even /dev/ttySAC0 as serial port. /det/ttyS{0,1,2} are in /dev/ dir as character device but /dev/ttySAC0 is in /dev/ is just a regular file and content of it is : "Done" ... . kernel params and other bios parameters are :

(i'm wondering why console param of bootargs is ttySAC0 ??? ) bootargs=3Dnoinitrd root=3D/dev/mtdblock2 init=3D/linuxrc console=3DttySAC0 bootcmd=3Dnboot 0x32000000 kernel; bootm 0x32000000 bootdelay=3D0 baudrate=3D115200 ethaddr=3D0a:1b:2c:3d:4e:5f ipaddr=3D192.168.1.6 serverip=3D192.168.1.8 netmask=3D255.255.255.0 stdin=3Dserial stdout=3Dserial stderr=3Dserial mtdids=3Dnand0=3Dnandflash0 mtdparts=3Dmtdparts=3Dnandflash0:256k(at)0(bios),128k(params),128k(toc),

512k(eboot),1024k(logo),2m(kernel),-) partition=3Dnand0,0 mtddevnum=3D0 mtddevname=3Dbios

i've enabled serial port options in kernel :

Serial drivers --->

| | 8250/16550 and compatible serial support =E2=94=82 =E2=94=82 [*] Console on 8250/16550 and compatible serial port =E2=94=82 =E2=94=82 (3) Maximum number of 8250/16550 serial ports =E2=94=82 =E2=94=82 (3) Number of 8250/16550 serial ports to register at ru= ntime =E2=94=82 =E2=94=82 [ ] Extended 8250/16550 serial driver options =E2=94=82 =E2=94=82 *** Non-8250 serial port support *** =E2=94=82 =E2=94=82 Samsung SoC serial support =E2=94=82 =E2=94=82 [*] Support for console on Samsung SoC serial port =E2=94=82 =E2=94=82 Samsung S3C2440/S3C2442 Serial port support

btw : out put of dmesg is : [root(at)FriendlyARM /dev]# dmesg | grep uart s3c2440-uart.0: tq2440_serial0 at MMIO 0x50000000 (irq =3D 70) is a S3C2440 s3c2440-uart.1: tq2440_serial1 at MMIO 0x50004000 (irq =3D 73) is a S3C2440 s3c2440-uart.2: tq2440_serial2 at MMIO 0x50008000 (irq =3D 76) is a S3C2440

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