Re: [Xen-devel] Xen Kernel (3.0.2) breaks b44 module

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 12 May 2006, at 09:57, Jan Beulich wrote:

> This ought to be attributed to the fact that B44 supports only 30-bit 
> DMA addresses (and does special checking), but
> XenLinux doesn't have a distinct DMA zone restricted to 24-bit 
> addresses, and both dma_alloc_coherent() and swiotlb are
> restricting physical addresses to 31 bits only (at least the former 
> could certainly look at the device's DMA mask and
> use that value rather than hard-coding 31).
If dma_alloc_coherent isn't doing that then it should be patched to do 
so. Even though it won't help right now (since Xen will reject any 
requests more restricted than 31 bits) it will be needed when Xen is 
fixed to support basket-case hardware.
 -- Keir


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