Mike Winter wrote:
We are developing with an 8248-based platform, and we have a vendor telling us that the PCI hardware is unreliable on this CPU family, in particular the DMA functionality. A quick search of this list doesn't turn up any horror stories, although the processor does have some PCI errata listed. Does anybody have any practical experience using PCI on the 8248 or similar that they can share with me? Thanks.
Make sure that you park the bus on PCI, and elevate PCI's arbitration priority. See fixup_pci() in arch/powerpc/boot/cuboot-pq2.c.
I haven't had a problem with PCI DMA when that is done, though I haven't done significant stress testing.
-Scott _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
