使用Blackfin的BF561芯片和uClinux的嵌入式环境，LC6311 TD开发板模块。
一、关于PPP拨号工具的配置
关于PPP支持：
http://docs.blackfin.uclinux.org/doku.php?id=uclinux-dist:ppp&s[]=ppp
make linux_menuconfig
Device Drivers --->
Network device support --->
<*> PPP (point-to-point protocol) support
<*> PPP support for async serial ports
<*> SLIP (serial line) support
[*] CSLIP compressed headers
[*] Keepalive and linefill
make config_menuconfig
Network Applications --->
[*] pppd
[ ] enable PPPOE (NEW) ＃注意这个不要选
Miscellaneous Applications
[*] chat
二、关于串口正常工作的配置
make linux_menuconfig
Device Drivers --->
Character devices-→
<*> blackfin serial port support
<*> console on Blackfin serial ports
<*> UART mode-->
<*>DMA mode
<*> Enable UART0 hardware flow control
<*>UART0 CTS PIN
<*>UART0 RTS PIN
三、关于USB口正常工作的配置
主要两部分：
USB部分以及SCSI的设置用于支持U盘等。
Device Drivers --->
USB support --->
<*> Support for Host-side USB
[*] USB device class-devices (DEPRECATED)
<*> ISP1362 HCD support
--- NOTE: USB_STORAGE enables SCSI, and 'SCSI disk support'
--- may also be needed; see USB_STORAGE Help for more information
<*> USB Mass Storage support
SCSI device support --->
<*> SCSI device support
[*] legacy /proc/scsi/ support
<*> SCSI disk support
[*] Probe all LUNs on each SCSI device
四、拨号脚本
在uClinux-dist-2008R1-RC8/user/pppd/ppp-2.4.4/etc.ppp/下新建两个文件夹peers和chat,分别存放TD和td2脚本文件，重新编译内核，telnet远程登录到板卡系统中，使用pppd call TD命令进行拨号即可。
在/etc/ppp/peers下的TD脚本为：
modem
ttyUSB0或ttyS0
115200
crtscts或nocrtscts
connect '/usr/sbin/chat -v -f /etc/ppp/chat/td2'
mru 1154
mtu 1154
debug
noauth
nodetach
noipdefault
defaultroute
在/etc/ppp/chat下的td2脚本为：
ABORT BUSY
ABORT 'NO CARRIER'
ABORT 'ERROR'
ABORT '+CME ERROR: 100'
''
AT+CFUN=5
OK
AT+CFUN=1
OK
AT+COPS=0
OK
AT+CGDCONT=1,"IP","CMNET","",0,0
OK
AT+CGEQREQ=1,2,128,128,64,64,0,0,"0E0","0E0",,0,0
OK
ATD*98*1#
TIMEOUT 20
CONNECT
在/etc/ppp下的options脚本为：
lock
nocrtscts
nocdtrcts
local
novj
usepeerdns
defaultroute
noipdefault
ipcp-accept-local
ipcp-accept-remote
在使用串口拨号的时候使用硬件流控，在使用USB拨号的时候不使用硬件流控，在使用USB模块的时候，首先在内核配置的时候，
Device Drivers ---> USB support ---> USB Serial Converter support --->
<M> USB Serial Converter support
[*] USB Generic Serial Driver
生成的usbserial.ko加载到开发板内核,并创建3G模块设备节点,即在系统启动后对应的/lib/…/usb/serial/下执行以下命令即可。
insmod usbserial.ko vendor=0x1ab7 product=0x6000
mknod /dev/ttyUSB0 c 188 0