[openib-general] PPC64 2.6 kernel support

Mon Mar 29 06:41:22 PST 2004

On Mon, Mar 29, 2004 at 06:19:04AM -0800, Roland Dreier wrote:
>     Christoph> The real problem are making the code 64bit clean (if
>     Christoph> not yet done) and using the proper dma abstractions
>     Christoph> which is required when using the iommu.
> 
> The code is 64-bit clean (and has been extensively tested on amd64 and
> ia64).  Unfortunately the code does not use the proper DMA
> abstractions -- hence my earlier question about whether just using
> physical addresses from a 64-bit capable PCI device will work on G5.

dma_addr_t on ppc64 is currently 32bits, so DAC addressing certainly
doesn't work.  On the IBM machines that's because the Hypervisor wants
control over the DMA, but I don't know why it's that way on the G5.

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