cc1101 first version
add cc1101_hw.c
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
Merge branch 'master' of https://github.com/RT-Thread/rt-thread
Update SConscript: add spi to include path.
update lwip git head
add conditional compilation of ipv6 source file
change code style
add judge of RT_USING_LWIP_HEAD
Merge pull request #330 from hduffddybz/ipv6

Add conditional compilation about IPv6 sources and headers, change code style
tools/building: remove the use of startupinfo

The startupinfo does not have any visible effects on the building
process and some old Python version does not have it at all. So remove
it for the seek of simple.

Tested `scons -j4` in a dual core virtual machine.
minilibc: define SIZE_MAX in stdint.h
Merge pull request #331 from grissiom/fix-building

tools/building: remove the use of startupinfo
Merge pull request #332 from grissiom/fix-minilibc

minilibc: define SIZE_MAX in stdint.h
[Serial] BUG Fix: data be send twice in mode that other than polling
Merge pull request #335 from heyuanjie87/ForPullRequest

[Serial] BUG Fix: data be send twice in mode that other than polling
Merge branch 'master' of https://github.com/RT-Thread/rt-thread