Does anyone have any example code they could provide me that shows correct usage of the Linux 2.6.x PPC-4xx scatter/gather DMA functionality? None of the mainline kernel tree sources or module sources seem to use this functionality.
I am working on a driver that runs on an embedded PPC-405gp running linux 2.4.21. The driver relies extensively on the PPC's DMA controller using all 4 channels simultaneously. After some research I determined that the version of the dma code that was in 2.4.21 had been significantly modified in more recent kernel trees. As a result I have merged in the 2.6.x version of this code, but am running into some trouble with sg transfers. Specifically, after setting up an sgl the way I used to with the 2.4.21 kernel, and then kicking off the transfer, nothing seems to get transferred. When I attempt to remove sg elements from the sgl, the kernel complains saying that I'm trying to remove an element from an already empty sgl. Any help, advice, or examples would be greatly appreciated. Thanks. ______________________ Greg Buhler Embedded INFOSEC Systems Network Systems Group ViaSat, Inc 760.476.2699 greg.buhler at viasat.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20060208/8492d957/attachment.htm
