介绍atmel的at91sam系列arm的启动过程，对开发很有帮助。

Hands-on set-up – Requirements and procedure for setting at91sam development environment

AT91SAM 库函数文档，说明很详细，非常容易明白。非常有用的。-The AT91SAM library function documentation, very detailed, very easy to understand. Very useful.

at91sam 9x25 datasheet 对学习sam9x25 帮助非常大，首先要了解各部件的关系和具体应用。(AT91SAM 9x25 datasheet is very helpful for learning sam9x25, first of all, we should understand the relationship and specific application of each component.)