SEP6200 Support
Cleanup and add licencse
simulator: update to support simulator for linux
Merge pull request #134 from prife/sim-fix

simulator: update to support simulator for linux
add initialization debug code
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
modify codes for fractional divider
add NRZ feature on K60
fix a bug in rt_hw_uart_init() where u CAN NOT init some feature.
delete K60.pro
remove a var for INT_TX.
Merge pull request #135 from reynoldxu/K60Fxxxx

K60 fxxxx
Add ramfs into building script
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
add device_open/close in mkfs
fix O_APPEND write issue in RAMFS
Merge pull request #132 from MrVan/sep6200

SEP6200 Support
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
add buildlib for Keil MDK
remove compiling warning