Hi Frank, On 2002.02.08 22:04 Frank C . Earl wrote: > On Thursday 07 February 2002 12:37 pm, Jose Fonseca wrote: > > > Their glossary (http://utah-glx.sourceforge.net/faq.html#AEN364) gives > > the definition of PIO, DMA and Pseudo DMA. > > PsuedoDMA is pushing the command data in a DMA-able format to an engine > that > issues PIO commands one-by-one. It's actually slower than doing PIO > commands, but allows you to have one pathway for all conditions instead > of > two differing ways of sending commands to the chip, which makes for > easier > development in the blocks of code issuing the rendering commands. > > On a different note, I had some things come up that kept me away from > completing the initial cut of the Mach64 DMA code- I should be getting > back > on track over this weekend and should be building a sub-branch of the > Mach64
It's good news indeed! I was expecting hearing from you some time ago but I didn't dare to bother you since I know how busy your life has been lately.. > branch shortly. It will NOT be secure (in the sense that ill-behaved > code > can't take a box out) for this revision while I work out the details of Does this mean that client code can lock the card but is not really capable of putting the security of the system in danger? > securing it. Unlike the other chips, apparently there's no distinction > between sets of commands such that I can say, "here's a set of verticies, > go Sorry for the dumb question (my knowledge of the DMA mechanism is still rather incomplete..), but in what way the distinction of the set of commands (in the DMA buffers I presume) affects the security? > to it," to the chip, so I either have to come up with a PDMA-ish > convention > that will degrade performance or come up with some sort of watchdog > process > inside the module to detect a hang and reset the chip accordingly. (My > vote > is for seeing if we can come up with a quick check for a locked up state > and > doing a reset as we now know how to do a full reset that resets the DMA, > etc. > on the chip from all of our hacking about to get the DMA test working.). > > -- > Frank Earl > Regards, Jos� Fonseca _________________________________________________________ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
