Hello, We have inherited an older driver that uses kmalloc() and vtophys (which resolves to the __pa() macro) to create memory accessible by an external PCI device doing bus master read/writes. The driver works Ok on several x86 machines, but is failing on a PPC board (MPC7447/8) running Gentoo Linux 2.6.9. After looking at PCI bus analyzer captures, it seems the physical address the driver is giving to the PCI device is invalid, so the device ends up reading/writing incorrect memory areas.
What are the up-to-date APIs we should be using for DMA memory allocation and virtual-to-physical address translation? We have another driver for another device that's working fine on this board and it uses pci_alloc_consistent(). What about bus_space_vaddr()? I'm hoping to get a recommendation for what's currently appropriate and most future-proof for drivers that depend on external PCI DMA. Any suggestions welcome. Thanks. -Jeff _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
