> 1. I open /dev/mem and get a file descriptor > 2. I use mmap to reserve some physical addresses for my buffers in > user space. > 3. I give that address to the FPGA for DMA use. > 4. When I get the FPGA interrupt, I invalidate the data cache and > write the data to disk > > Does that sound like it would work? Would the address I receive > from mmap() and pass to the FPGA be the actual physical address, or > would I need to send the physical address to the FPGA and use the > mmap() address to access and write to disk?
One more question about this approach: does the mmap() call prevent the kernel from using this memory for other purposes? Will the kernel be able to "move" this memory elsewhere? I guess what I am asking is if this memory is locked for all other purposes? _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
