All, I have what may be an unconventional question:
Our application consists of data being captured by an FPGA, processed, and transferred to SDRAM. I simply give the FPGA an address of where I want it stored in SDRAM and it simply DMAs the data over and interrupts me when finished. I then take that data and store it to disk. I have code in user space that handles all of the writing to disk nicely and fast enough for my application (I am capturing data at about 35-40 Mbytes/sec). My question is this: is it possible to give a user-space pointer to the FPGA to DMA to? It seems like I would have problems with alignment, address manipulation, and a whole slew of other issues. What would be the best way to accomplish something like that? I want to handle all the disk access in user-space, but I do not want to have to copy 40 MB/s from kernel space to user-space either. I can maintain an allocated, DMA-safe buffer in kernel space if needed. Can I simply get a user-space pointer to that buffer? What calls are needed to translate addresses? Thanks for the help! I am still a newbie when it comes to kernel programming, so I really appreciate the help! Jonathan _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
