Re: DMA Mapping

[Guo Hongruan <camelguo@xxxxxxxxx>]

dma_handle is a output parameter. When dma_alloc_coherent returns, the 
return value is the virtual address of the memory malloced and the 
dma_handle is the DMA address of it. You may need to pass it to your 
device register.

jeyram jadenthradevan 写道:
> hello every one,
>
>
> void *dma_alloc_coherent(struct device *dev, size_t size,
>                          dma_addr_t *dma_handle, int flag);
>
> here what is the usage of dma_handle ?
>
> thank you.
> -jeyram

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