交叉工具：
crosstool-ng.org
crosstool.net
processors.wiki.ti.com/index.php/linux_toolchainarm_toolchain_pdf
gnuarm.org
gnutoolchains.com
wiki:搜索cross compile可详细了解toolchains
bb.osmocom.org/trac/wiki/gnuarmtoolchain
kegel.com/crosstool
平台：
codeblocks.org
uboot:
right.com.cn/forum/thread-141333-1-1.html 编译教程uboot的
CM3:
wiki上：list of arm cortex-m development tools
eclipse:编译cm3
hertaville.com/2012/05/28/gcc-arm-toolchain-stm32fodiscovery
kernel build:
kernelnewbies.org/kernel build
kroah.com/lkn
usb:
LFS:
从分散包安装linux,可以折腾
gcc.gnu.org/install/configure.html
