Hi, I am working on a research project for which I should be able to transfer data from memory to memory using DMA. I am working on a x86 machine but I want my code to be architecture independent as much as possible. Please accept my apology if my question is too basic to be asked from this mailing list. Here is my problem: I used "struct dma_chan" to define a channel structure but when I use "dma_request_channel" function to get a DMA channel, with all different possible masks including DMA_MEMCPY, DMA_PRIVATE,.... anything, the function returns always NULL. This function is defined in "dmaengine.h". I also tried a low level function to see dma channel availability and "request_dma" function defined in "dma.h" works perfect. Any comment, help, document, program, reference anything that helps me to create a simple DMA transaction would really be appreciated. PS: There is a test program called dmatest.c is provided in the linux kernel files. I tried to get it compiled but I could not since the functions and structures used in this file has been changed in the kernel header files. Thanks -- ---Mahdi Hamzeh -- To unsubscribe from this list: send the line "unsubscribe linux-modules" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
