驱动拟定完成了以下几个功能：
1、DMA一致性内存的申请，返回给用户使用；
2、DMA一致性内存的释放；
3、DMA一致性内存的映射（mmap）；
4、给定源实地址和目的实地址，完成A-sync或AB-sync两种模式的DMA内存搬运，TC0~TC3可选，模式可选； 源码下载地址http://download.csdn.net/detail/mantis_1984/7364043
1、写了个小测试程序，完成edma3驱动的验证
2、验证过程：调用edma3驱动，申请两段DMA内存，返回给用户空间，用户调用mmap，然后
将src空间置为0x5a，dst空间置为0，然后调用EDMA3实现src到dst的搬移，应用查看dst空间的结果，
确实都置为0x5a，证明edma3的搬运成功了。
3、附：部分调试信息 /opt/autorun # ./edma_test_drv &
/opt/autorun # edma3_drv WRN: edma3_drv_open edma3_drv DEBUG: Allocated DMA phy memory: Phy Address: 0x85332000 Virtual Address :0xffc11000 Size :0x400 successfull!!
edma3_drv DEBUG: Allocated DMA phy memory: Phy Address: 0x89316000 Virtual Address :0xffc12000 Size :0x400 successfull!!
"src/edma_test_dedma3_drv DEBUG: result: 4 rv.c" line 137 [edma3_drv DEBUG:
From Callback 1: Channel 4 status is: 1 dbg]: src phyaddr:0x85332000, virtaddr: 0xffc11000
"src/edma_test_drv.c" line 140 [dbg]: dst phyaddr:0x89316000, virtaddr: 0xffc12000
"src/edma_test_drv.c" line 171 [dbg]: 0x5a
"src/edma_test_drv.c" line 171 [dbg]: 0x5a
"src/edma_test_drv.c" line 171 [dbg]: 0x5a
"src/edma_test_drv.c" line 171 [dbg]: 0x5a
"src/edma_test_drv.c" line 171 [dbg]: 0x5a
"src/edma_test_drv.c" line 171 [dbg]: 0x5a
......