On Thu, 23 Jan 2003, Ravi wrote: > The size and address range of DMA zone can not be specified > at runtime. It is architecture specific, and is fixed. For > example, DMA zone on i386 is from 0 to 16MB (physical address). That is when you're using the 8237A DMAC (DMA Controller), otherwise busmaster devices can access as large an address space as their onboard DMACs allow. E.g. some sound cards have DMACs which can only DMA within the 24bit address space and some other devices can DMA upto a 64bit address space using Dual Address Cycle (DAC). All this should be set with pci_set_dma_mask and allocations done with pci_alloc_consistent and friends. Have a look at Documentation/IO-mapping.txt. Zwane -- function.linuxpower.ca -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
