On Monday 11 March 2002 01:55, Frank C. Earl wrote: > On Sunday 10 March 2002 11:44 am, Jos? Fonseca wrote: > > I really don't know much about that, since it must happened before I > > subscribed to this mailing list, but perhaps you'll want to take a look > > to the Utah-GLX and this list archives. You can get these archives in > > mbox format and also filtered with just the messages regarding mach64 at > > http://mefriss1.swan.ac.uk/~jfonseca/dri/mailing-lists/ > > The problem was that the XAA driver for mach64 was setting the FIFO size up > for some reason and it was leaving the chip in a state that wouldn't work > for the DMA mode. If we set the size back to the default setting before we > do the first DMA pass, everybody's happy. I suspect if we got with the > developer of the XAA driver we can sell him on leaving that setting alone > in the driver's setup. > > Sorry for being silent for so long gang. Been, yet again, crushed under > with lovely personal business. I have started a new branch > (mach64-0-0-3-dma-branch), and I'm actually putting the hacks I've been > playing with into a unified DMA framework. I should be putting the first > updates to the branch in over the next couple of days. > > Of note, when I did find some spare time, I ran tests on what we needed to > do to secure the chip's DMA path. I found out some interesting facts. > > It will accept any values written to the registers. > It will not act on any of those settings during the DMA pass unless they're > a GUI specific operation when it's doing a command-type DMA. > It will not act on many of the settings after a DMA pass is complete. > It will not let you set up any sort of DMA pass during the operation. > Junk commands, by themselves, do not seem to hose up the engine in > operation. Mapping and unmapping a memory space is somewhat compute > intensive.
Thanks Frank, this was just what I was after... _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
