基于S3C2410的串口扩展的驱动程序 扩展芯片采用SC16C554，利用总线扩展出四个独立的RS232串口。 嵌入式系统是 linux 2.6-13,Based on S3C2410 serial driver for the expansion of the expansion of the chip SC16C554, the expansion of the use of the bus four independent RS232 serial port. Embedded s