编译好u-boot后，在u-boot根目录下，运行以下命令，在qemu中模拟运行u-boot:
$ qemu-system-arm -M XXXX -m 256M -nographic -kernel u-boot
出现以下错误：
oss: Could not initialize DAC
oss: Failed to open `/dev/dsp'
oss: Reason: No such file or directory
oss: Could not initialize DAC
oss: Failed to open `/dev/dsp'
oss: Reason: No such file or directory
audio: Failed to create voice `lm4549.out'
目前不知道该如何解决。。。。。。