On Sat, 27 Apr 2002, José Fonseca wrote: > On 2002.04.27 15:33 Benjamin Herrenschmidt wrote: > > > > > >I don't see how. The function in which Leif fixed the big had a debug > > >output statement which would appear in the kmsg if it was the last one. > > > > > > From what I've read the *_nopage functions are associated with > > accessing > > >memory maped regions. It could be that the DMA pages aren't being > > properly > > >maped in the client memory space due to some x86 architecture specific > > >assumption in the DRM. > > > > What type of DMA page are you using ? The AGP ones ? The DRM in my > > kernels have hacks to make this work with Apple UniNorth chipset > > (though I never managed to have AGP operations stable with neither > > r128 or radeon, the card dies after a while). If it's normal > > PCI DMA, there should be no difference between x86 and PPC, at > > least on pmacs > > It's normal PCI DMA. > > > > > What PPC machine is this ? (sorry, I missed the beginning of the > > It was never specified so far.
Peter said it was an iBook, so it's mac ppc. He couldn't get agpgart working, would this be the UniNorth chipset? > > thread). On some PPC's like PReP, the mapping between bus addresses > > and CPU physical addresses on PCI isn't 1:1 and the system RAM is > > not mapped at 0 for bus mastering PCI devices. If you use the PCI > > DMA API, things are ok. If you aren't, then some tweaks may be needed. > > (See the definition of deprecated virt_to_bus in asm-ppc/io.h) > > The DRM doesn't use the PCI DMA API. Instead does everything manually. > > Why do you say virt_to_bus is deprecated? Where can I find more > information about these APIs? Look at IO-mapping.txt and DMA-mapping.txt in the Documentation dir of the Linux kernel source. > > > > Ben. > > > > José Fonseca > > _______________________________________________ > 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
