About u-boot

note:
1./include/version.h  ------for outputting information about the version of u-boot
2./board/flash.c  -------modify "ifdef CONFIG_B2" to write and save data to the flash
3./include/configs/myboard.h-------information about the board,exp.:the address of flash and
 dram,and settings about u-boot
4./board/myboard/config.mk--------set the address of u-boot reloaded at the dram
5./driver/rtl8019.h and rtl8019.c-------set 8bits or 16 bits of data bus