If you don't want dynamic memory allocation for framebuffer and neither do you want it in the user space, All you need is to pass memmap = <size>$<start address> to the kernel and then write a kernel module module where you ioremap that physical address space. This is just like any other device driver where device registers are mapped. On Wed, Oct 30, 2013 at 7:56 PM, Kai <kai@kunfoo.org> wrote:
On Wed, Oct 30, 2013 at 04:20:30PM +0530, srinivas bakki wrote:
But otherwise am wondering why would you need to tell the FPGA these kernel mapped addresses ? How is it connected to the memory module ?
The FPGA seems to have direct access to the memory. If I would allocate memory for the framebuffer dynamically, I would first have to find out the physical adress of this area, and then tell it to the FPGA, so it can read the frames from there. We are implementing a "GPU" on the FPGA here, or at least something that's reading frames from the RAM, to send it to the VGA port. -- Grüße, Kai
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