On Fri, 2010-10-01 at 21:31 -0400, Josh Boyer wrote: > > +config ARCH_DMA_ADDR_T_64BIT > > + def_bool ARCH_PHYS_ADDR_T_64BIT > > + > > I seemed to have missed what this is about entirely. Is there some > place I can look that describes what that is supposed to do? The PPC > 4xx boards set PHYS_ADDR_T_64BIT because the MMU uses 36 bit > addressing, but the CPU is only 32 bits. I want to make sure this DMA > thing isn't going to cause problems.
Yes, we need to test a bit. Our dma_addr_t has remained 32-bit so far because despite the fact that we've had routinely to deal with >32-bit physical addresses for MMIO, physical memory support has been constrained afaik to 32-bit. We might be better off keeping this as something individual platforms can select... Cheers, Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
