On Tue 15 Jan 14:11 PST 2019, Doug Anderson wrote:
> Hi,
>
> On Mon, Jan 14, 2019 at 1:19 PM Bjorn Andersson
> wrote:
> >
> > DMA memory allocations for devices on the soc bus must be constrained to
> > the 36 address bits that the bus provides, which without IOMMU is taken
> > care of by the
Hi,
On Mon, Jan 14, 2019 at 1:19 PM Bjorn Andersson
wrote:
>
> DMA memory allocations for devices on the soc bus must be constrained to
> the 36 address bits that the bus provides, which without IOMMU is taken
> care of by the addresses being direct physical allocations.
The above confuses me
DMA memory allocations for devices on the soc bus must be constrained to
the 36 address bits that the bus provides, which without IOMMU is taken
care of by the addresses being direct physical allocations.
Unless the bus_dma_mask is defined DMA allocations for devices will use
all 40 bits
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