On Friday 18 July 2008, Misbah khan wrote: > Now my concern is How can i map SDRAM one to one to circular buffer of such > a huge size ????
As I mentioned, use vmalloc to get the memory, and provide an mmap function that uses remap_vmalloc_range to put it into the user address space. > My idea is that i will ioreamp SDRAM and do memcpy_toio() when ever i am > writing to the the circular buffer which is dma allocated and pages are set > reserved . and read the frame from user space . ioremap and memcpy_toio style accesses only make sense for stuff that is *not* your main memory. Memory is alrady directly accessible in the kernel after allocating with get_free_pages, kmalloc or vmalloc. No need to play with __iomem pointers for this. Arnd <>< _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded