dma_alloc_coherent返回的地址是内核虚拟地址吗?
char *src;dma_addr_t memory_phy_base;
src = dma_alloc_coherent(NULL, 0x4000, &memory_phy_base, GFP_KERNEL|GFP_DMA);
printk("src:%08lx, virt_to_phys: %08lx, actual_phys: %08lx,phy_to_virt: %08lx",
(unsigned long)src,
(unsigned long)virt_to_phys(src),
(unsigned long )memory_phy_base,
(unsigned long)phys_to_virt(memory_phy_base));
运行结果：
src:ff8ee000, virt_to_phys: df8ee000, actual_phys: a0080000,phy_to_virt: c0080000
内核中设置的
phys_base_addr：a065a000
virt_base_addr：c065a000
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