Re: Dma addr should use Kuseg1 for MIPS32?

[zhangfx <zhangfx@lemote.com>]

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physical address (address comes out of the CPU bus to memory) can be 
different with bus address(used by DMA) in MIPS boards.

figo zhang 写道:
> hi,
>
> I am writing a driver for MIPS32. i wirte this code for DMA addr:
>
> dma_vaddr =(char*) __get_free_pages(GFP_KERNEL|GFP_DMA, order);
> dma_phy = virt_to_phy(dma_vaddr);
>
> i write dma_phy to DMA base register, but why it cannot work? it 
> should write Kseg1 space to DMA register?
> I remember that it is ok for ARM/X86 .
>
>
> Best,
> Figo.zhang

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