http://blog.csdn.net/likeping/article/details/42235111 linux下dma 管理
http://blog.csdn.net/skyflying2012/article/details/48023447 cache和内存一致性.
http://www.360doc.com/content/16/0510/07/478627_557742072.shtml
http://lyl19.blog.163.com/blog/static/1942720552013310103745840/ dma MEMERY
http://blog.csdn.net/cywosp/article/details/8767327 syn 同步
嵌入式开发之hi3519--- pcie dma和dma cache 缓存更新sync memery
原文：http://www.cnblogs.com/pengkunfan/p/7875065.html