On Mon, Mar 10, 2003 at 01:15:57PM +0000, jeff.boyd at att.net wrote: > > I am having a problem doing PCI/memory DMA on the IBM 440 PPC because it has a > 36 bit DMA address to/from the PCI bus (3_8000_0000), but the resource > structure uses an unsigned long (which is a 32 bit quantity for gcc) to > store 'physical/bus/dma' address. There is a kludge to get proper page table > entries, which is to remap the 32 bit quatities into their 36 bit counterparts > and then sending them on to __ioremap which takes a (36 bit) physical address > input. This of course is no help to DMA, which wants not cpu (virtual) > address, > but physical (translated) address. I have done a similar kludge, making the 32 > to 36 bit translation into a function which a driver doing DMA can use. > However, it seems to me that the real answer here is to change the resource > definition to use a phys_addr_t rather than an unsigned long, for start/end. > Does anyone know if this change has been made anywhere, or if it is being > planned?
Maybe in 2.5/2.6. I was promised that resources would become 64-bit on _all_ platforms in 2.5 but it hasn't happened yet. I will have to beat on the people that were working on that. Of course, that's only one piece required to properly handle I/O >4GB on a 32-bit platform. Regards, -- Matt Porter porter at cox.net This is Linux Country. On a quiet night, you can hear Windows reboot. ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
