Re: [BISECTED REGRESSION] b43legacy broken on G4 PowerBook

From: Aaro Koskinen
Date: Tue Jun 11 2019 - 18:51:01 EST


On Tue, Jun 11, 2019 at 05:20:12PM -0500, Larry Finger wrote:
> It is obvious that the case of a mask smaller than min_mask should be
> handled by the IOMMU. In my system, CONFIG_IOMMU_SUPPORT is selected. All
> other CONFIG variables containing IOMMU are not selected. When
> dma_direct_supported() fails, should the system not try for an IOMMU
> solution? Is the driver asking for the wrong type of memory? It is doing a
> dma_and_set_mask_coherent() call.

I don't think we have IOMMU on G4. On G5 it should work (I remember fixing
b43 issue on G5, see 4c374af5fdee, unfortunately all my G5 Macs with b43
are dead and waiting for re-capping).