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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