Hi I've PCI device which uses DMA engines and runs on 64 bit Linux with 512MB RAM.It has 32 bit register used to specify DMA buffer address so as far as I understand I need to restrict it DMA buffers addresses to 32 bit. I tried the following: err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));if (err) {    exit...} dma_alloc_coherent(dev, 0x1000, &dma_handle, GFP_KERNEL) but when I print allocated buffer address I get the following 0x409993216 What am I missing here? Thanks,Tal