On Mon, 7 Jan 2002, Manuel Teira wrote: > Hello again. First of all, happy new year to everybody.
Happy New Year! > Well, after the holidays, I would like to recover the development in the > mach64 branch. I started today to investigate the DMA stuff because I think > that perhaps Frank is very busy and he has no time to do this work. The DMA > problem was discovered aprox. Oct 21th and we have no news about any progress > in DMA. I'm sure that Frank would do it better than me, but I can try. It sounded like Frank had written some code already (he mentioned being "halfway done" in early December). Frank, is your work in a state that could be commited to the branch so others could help finish it? If so, this might be a good place to start a new branch tag since we currently have a "working" driver. Before long we'll also need to merge in changes from the trunk, since 4.2.0 seems close to release. > And now, the questions: > > I've been looking at the r128 freelist implementation, so I've derived that > the register called R128_LAST_DISPATCH_REG (actually R128_GUI_SCRATCH_REG1) > is used to store the age of the last discarded buffer. So, the > r128_freelist_get is able to wait for a discarded buffer if there's no free > buffer available. > > Could this be made in the mach64 driver, say with MACH64_SCRATCH_REG1 ? In my > register reference it says that these registers can be for exchanging > information between the BIOS and card drivers, so, is sane to use them for > this task? I'm not sure that that would be safe to use. According to r128_reg.h, the r128 has BIOS scratch registers and GUI scratch registers, where the mach64 has only the scratch registers used by the BIOS. The mach64 Programmer's Guide says that SCRATCH_REG1 is used to store the ROM segment location and installed mode information and should only be used by the BIOS or a driver to get the ROM segment location for calling ROM service routines. > I've also seen that there's no r128_freelist_put (it's present in mga driver, > for example). Isn't it necessary? > > And, when is a buffer supposed to be discarded. Is this situation produced in > the client side? > > > Best regards. > > -- > Manuel Teira > > > _______________________________________________ > Dri-devel mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/dri-devel > -- Leif Delgass http://www.retinalburn.net _______________________________________________ Dri-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/dri-devel
