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Add checking ISA DMA flag in cpu_loop. Also need to do bios_init manually for now. With this change, floppy is functional. Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com> Signed-off-by: Arun Sharma <arun.sharma@intel.com> Signed-off-by: ian.pratt@cl.cam.ac.uk