I have added a one sentence announcement to the front page. http://wiki.opengraphics.org/tiki-index.php?page=HomePage
improvements/suggestions welcome JHB On 10/01/2009, Timothy Normand Miller <[email protected]> wrote: > We've had OGD1 working as an unaccelerated non-VGA framebuffer device > working for some time now. On and off over the last month, we've been > working out the major show-stopping bugs in HQ (the MIPS-like > microcontroller we developed to emulate VGA). One of the major > development problems was that, unlike the Xilinx tools, the Lattice > synthesizer seemed to be unable to infer and properly deal with the > relationship between the primary clock that runs most of HQ and the > double-rate clock that ran its 3-port register file. We worked around > that by duplicating the register file (possibly not actually > increasing the amount of logic dedicated to it), running it on the > primary clock, and extending the results forwarding mechanism to > handle simultaneous read and write-back to the same register. It > turns out that with the 2x clock, about the fastest we would have been > able to run HQ was about 50MHz. With these changes, we can run it > easily at 80MHz. Our target is at least 100MHz, but at the moment, > this is acceptable for development purposes. We'll defer further > optimization to a later time so that we can concentrate on the details > of making VGA work. The first step is do develop just enough HQ > microcode and x86 BIOS code that we can trick a PC into thinking it's > a real VGA card; the objective is to be able to boot into Linux > without a functional display so that we can incrementally develop the > code that will make VGA actually put up a working display. > > -- > Timothy Normand Miller > http://www.cse.ohio-state.edu/~millerti > Open Graphics Project > _______________________________________________ > Open-graphics mailing list > [email protected] > http://lists.duskglow.com/mailman/listinfo/open-graphics > List service provided by Duskglow Consulting, LLC (www.duskglow.com) > _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
