Hi Arnd, On Thursday 26 September 2013 03:21 PM, Arnd Bergmann wrote: > On Thursday 26 September 2013, Kishon Vijay Abraham I wrote: >> On Wednesday 25 September 2013 02:53 AM, Arnd Bergmann wrote: >>> On Monday 23 September 2013, Kishon Vijay Abraham I wrote: >>>> Btw if we hadn't programmed inbound translation table, the address will go >>>> untranslated (according to the data book). I guess that's how it was working >>>> for Jingoo Han. >>>> >>>> ** >>>> 3.10.4 >>>> Inbound iATU Operation >>>> >>>> When there is no match, then the address is untranslated >>>> ** >>>> >>> >>> Well, that should work just as well, since you have a 1:1 translation anyway. >>> Do you get the same error without the translation? >> >> Yes. I get the same non-fatal error interrupt in RC. > > Ok, then I guess the translation is actually not at fault here but something > else. I would recommend looking at the IOMMU as the potential culprit. Maybe > having it disabled means that no DMA is going through, rather than all DMA > going through untranslated. Another possibility is that the IOMMU is set up > so that when disabled, it maps DMA address 0 to the start of RAM, rather > than identity mapping DMA address 0x80000000 there. If that's the case, > you either have to use the IOMMU, or set up the mapping in the root > complex to revert it. Thanks for your inputs. I'll check if that's the problem. Thanks Kishon -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
